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Circuit breaker
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For other uses, see Circuit breaker (disambiguation).
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v
t
e
Circuit Breaker
Electronic symbol
An air circuit breaker for low-voltage (less than 1,000 volt) power distribution switchgear
A two-pole miniature circuit breaker
Four one-pole miniature circuit breakers
Molded-case or miniature circuit breaker
A circuit breaker is an automatically operated electrical switch designed to protect an electrical circuit from damage caused by excess current from an overload or short circuit. Its basic function is to interrupt current flow after a fault is detected. Unlike a fuse, which operates once and then must be replaced, a circuit breaker can be reset (either manually or automatically) to resume normal operation.
Circuit breakers are made in varying sizes, from small devices that protect low-current circuits or individual household appliance, up to large switchgear designed to protect high voltage circuits feeding an entire city. The generic function of a circuit breaker, RCD or a fuse, as an automatic means of removing power from a faulty system is often abbreviated as OCPD (Over Current Protection Device).
Contents
1 Origins
2 Operation
3 Arc interruption
4 Short-circuit
5 Standard current ratings
6 Types
6.1 Low-voltage
6.2 Magnetic
6.3 Thermal-magnetic
6.4 Magnetic-hydraulic
6.5 Common trip breakers
6.6 Medium-voltage
6.7 High-voltage
6.8 Sulfur hexafluoride (SF6) high-voltage
6.9 Disconnecting circuit breaker (DCB)
6.10 Carbon dioxide (CO2) high-voltage
7 "Smart" circuit breakers
8 Other breakers
9 See also
10 References
Origins[edit]
An early form of circuit breaker was described by Thomas Edison in an 1879 patent application, although his commercial power distribution system used fuses.[1] Its purpose was to protect lighting circuit wiring from accidental short circuits and overloads. A modern miniature circuit breaker similar to the ones now in use was patented by Brown, Boveri & Cie in 1924. Hugo Stotz, an engineer who had sold his company to BBC, was credited as the inventor on DRP (Deutsches Reichspatent) 458392.[2] Stotz's invention was the forerunner of the modern thermal-magnetic breaker commonly used in household load centers to this day.
Interconnection of multiple generator sources into an electrical grid required development of circuit breakers with increasing voltage ratings and increased ability to safely interrupt the increasing short-circuit currents produced by networks. Simple air-break manual switches produced hazardous arcs when interrupting high voltages; these gave way to oil-enclosed contacts, and various forms using directed flow of pressurized air, or of pressurized oil, to cool and interrupt the arc. By 1935, the specially constructed circuit breakers used at the Boulder Dam project use eight series breaks and pressurized oil flow to interrupt faults of up to 2,500 MVA, in three cycles of the AC power frequency.[3]
Operation[edit]
All circuit breaker systems have common features in their operation, but details vary substantially depending on the voltage class, current rating and type of the circuit breaker.
The circuit breaker must first detect a fault condition. In small mains and low voltage circuit breakers, this is usually done within the device itself. Typically, the heating or magnetic effects of electric current are employed. Circuit breakers for large currents or high voltages are usually arranged with protective relay pilot devices to sense a fault condition and to operate the opening mechanism. These typically require a separate power source, such as a battery, although some high-voltage circuit breakers are self-contained with current transformers, protective relays, and an internal control power source.
Once a fault is detected, the circuit breaker contacts must open to interrupt the circuit; this is commonly done using mechanically stored energy contained within the breaker, such as a spring or compressed air to separate the contacts. Circuit breakers may also use the higher current caused by the fault to separate the contacts, such as thermal expansion or a magnetic field. Small circuit breakers typically have a manual control lever to switch off the load or reset a tripped breaker, while larger units use solenoids to trip the mechanism, and electric motors to restore energy to the springs.
The circuit breaker contacts must carry the load current without excessive heating, and must also withstand the heat of the arc produced when interrupting (opening) the circuit. Contacts are made of copper or copper alloys, silver alloys and other highly conductive materials. Service life of the contacts is limited by the erosion of contact material due to arcing while interrupting the current. Miniature and molded-case circuit breakers are usually discarded when the contacts have worn, but power circuit breakers and high-voltage circuit breakers have replaceable contacts.
When a high current or voltage is interrupted, an arc is generated. The length of the arc is generally proportional to the voltage while the intensity (or heat) is proportional to the current. This arc must be contained, cooled and extinguished in a controlled way, so that the gap between the contacts can again withstand the voltage in the circuit. Different circuit breakers use vacuum, air, insulating gas, or oil as the medium the arc forms in. Different techniques are used to extinguish the arc including:
Lengthening or deflecting the arc
Intensive cooling (in jet chambers)
Division into partial arcs
Zero point quenching (contacts open at the zero current time crossing of the AC waveform, effectively breaking no load current at the time of opening. The zero crossing occurs at twice the line frequency; i.e., 100 times per second for 50 Hz and 120 times per second for 60 Hz AC.)
Connecting capacitors in parallel with contacts in DC circuits.
Finally, once the fault condition has been cleared, the contacts must again be closed to restore power to the interrupted circuit.
Arc interruption[edit]
Low-voltage miniature circuit breakers (MCB) use air alone to extinguish the arc. These circuit breakers contain so-called arc chutes, a stack of mutually insulated parallel metal plates that divide and cool the arc. By splitting the arc into smaller arcs the arc is cooled down while the arc voltage is increased and serves as an additional impedance that limits the current through the circuit breaker. The current-carrying parts near the contacts provide easy deflection of the arc into the arc chutes by a magnetic force of a current path, although magnetic blowout coils or permanent magnets could also deflect the arc into the arc chute (used on circuit breakers for higher ratings). The number of plates in the arc chute is dependent on the short-circuit rating and nominal voltage of the circuit breaker.
In larger ratings, oil circuit breakers rely upon vaporization of some of the oil to blast a jet of oil through the arc.[4]
Gas (usually sulfur hexafluoride) circuit breakers sometimes stretch the arc using a magnetic field, and then rely upon the dielectric strength of the sulfur hexafluoride (SF6) to quench the stretched arc.
Vacuum circuit breakers have minimal arcing (as there is nothing to ionize other than the contact material). The arc quenches when it is stretched a very small amount (less than 2–3 mm (0.079–0.118 in)). Vacuum circuit breakers are frequently used in modern medium-voltage switchgear to 38,000 volts.
Air circuit breakers may use compressed air to blow out the arc, or alternatively, the contacts are rapidly swung into a small sealed chamber, the escaping of the displaced air thus blowing out the arc.
Circuit breakers are usually able to terminate all current very quickly: typically the arc is extinguished between 30 ms and 150 ms after the mechanism has been tripped, depending upon age and construction of the device. The maximum current value and let-through energy determine the quality of the circuit breakers.
Short-circuit[edit]
Circuit breakers are rated both by the normal current that they are expected to carry, and the maximum short-circuit current that they can safely interrupt. This latter figure is the ampere interrupting capacity (AIC) of the breaker.
Under short-circuit conditions, the calculated maximum prospective short-circuit current may be many times the normal, rated current of the circuit. When electrical contacts open to interrupt a large current, there is a tendency for an arc to form between the opened contacts, which would allow the current to continue. This condition can create conductive ionized gases and molten or vaporized metal, which can cause further continuation of the arc, or creation of additional short circuits, potentially resulting in the explosion of the circuit breaker and the equipment that it is installed in. Therefore, circuit breakers must incorporate various features to divide and extinguish the arc.
The maximum short-circuit current that a breaker can interrupt is determined by testing. Application of a breaker in a circuit with a prospective short-circuit current higher than the breaker's interrupting capacity rating may result in failure of the breaker to safely interrupt a fault. In a worst-case scenario the breaker may successfully interrupt the fault, only to explode when reset.
Typical domestic panel circuit breakers are rated to interrupt 7004100000000000000♠10 kA (7004100000000000000♠10000 A) short-circuit current.
Miniature circuit breakers used to protect control circuits or small appliances may not have sufficient interrupting capacity to use at a panel board; these circuit breakers are called "supplemental circuit protectors" to distinguish them from distribution-type circuit breakers.
Standard current ratings[edit]
Time till trip versus current as multiple of nominal current
Circuit breakers are manufactured in standard sizes, using a system of preferred numbers to cover a range of ratings. Miniature circuit breakers have a fixed trip setting; changing the operating current value requires changing the whole circuit breaker. Larger circuit breakers can have adjustable trip settings, allowing standardized elements to be applied but with a setting intended to improve protection. For example, a circuit breaker with a 400 ampere "frame size" might have its overcurrent detection set to operate at only 300 amperes, to protect a feeder cable.
International Standards, IEC 60898-1 and European Standard EN 60898-1, define the rated current In of a circuit breaker for low voltage distribution applications as the maximum current that the breaker is designed to carry continuously (at an ambient air temperature of 30 °C). The commonly available preferred values for the rated current are1A,2A,4A, 6 A, 10 A, 13 A, 16 A, 20 A, 25 A, 32 A, 40 A, 50 A, 63 A, 80 A, 100 A,[5] and 125 A (similar to the R10 Renard series, but using 6, 13, and 32 instead of 6.3, 12.5, and 31.5 – it includes the 13 A current limit of British BS 1363 sockets). The circuit breaker is labeled with the rated current in amperes, but excluding the unit symbol, A. Instead, the ampere figure is preceded by a letter, B, C, or D, which indicates the instantaneous tripping current — that is, the minimum value of current that causes the circuit breaker to trip without intentional time delay (i.e., in less than 100 ms), expressed in terms of In:
Type
Instantaneous tripping current
B Above 3 In
C Above 5 In up to and including 10 In
D Above 10 In up to and including 20 In
K Above 8 In up to and including 12 In
For the protection of loads that cause frequent short duration (approximately 400 ms to 2 s) current peaks in normal operation.
Z Above 2 In up to and including 3 In for periods in the order of tens of seconds.
For the protection of loads such as semiconductor devices or measuring circuits using current transformers.
Circuit breakers are also rated by the maximum fault current that they can interrupt; this allows use of more economical devices on systems unlikely to develop the high short-circuit current found on, for example, a large commercial building distribution system.
In the United States, Underwriters Laboratories (UL) certifies equipment ratings, called Series Ratings (or "integrated equipment ratings") for circuit breaker equipment used for buildings. Power circuit breakers and medium- and high-voltage circuit breakers used for industrial or electric power systems are designed and tested to ANSI or IEEE standards in the C37 series.
Types[edit]
Front panel of a 1250 A air circuit breaker manufactured by ABB. This low voltage power circuit breaker can be withdrawn from its housing for servicing. Trip characteristics are configurable via DIP switches on the front panel.
Many classifications of circuit breakers can be made, based on their features such as voltage class, construction type, interrupting type, and structural features.
Low-voltage[edit]
Low-voltage (less than 1,000 VAC) types are common in domestic, commercial and industrial application, and include:
Miniature circuit breaker (MCB)—rated current not more than 100 A. Trip characteristics normally not adjustable. Thermal or thermal-magnetic operation. Breakers illustrated above are in this category.
Molded Case Circuit Breaker (MCCB)—rated current up to 2,500 A. Thermal or thermal-magnetic operation. Trip current may be adjustable in larger ratings.
Low-voltage power circuit breakers can be mounted in multi-tiers in low-voltage switchboards or switchgear cabinets.
The characteristics of low-voltage circuit breakers are given by international standards such as IEC 947. These circuit breakers are often installed in draw-out enclosures that allow removal and interchange without dismantling the switchgear.
Large low-voltage molded case and power circuit breakers may have electric motor operators so they can open and close under remote control. These may form part of an automatic transfer switch system for standby power.
Low-voltage circuit breakers are also made for direct-current (DC) applications, such as DC for subway lines. Direct current requires special breakers because the arc is continuous—unlike an AC arc, which tends to go out on each half cycle. A direct current circuit breaker has blow-out coils that generate a magnetic field that rapidly stretches the arc. Small circuit breakers are either installed directly in equipment, or are arranged in a breaker panel.
Inside of a circuit breaker
The DIN rail-mounted thermal-magnetic miniature circuit breaker is the most common style in modern domestic consumer units and commercial electrical distribution boards throughout Europe. The design includes the following components:
Actuator lever - used to manually trip and reset the circuit breaker. Also indicates the status of the circuit breaker (On or Off/tripped). Most breakers are designed so they can still trip even if the lever is held or locked in the "on" position. This is sometimes referred to as "free trip" or "positive trip" operation.
Actuator mechanism - forces the contacts together or apart.
Contacts - allow current when touching and break the current when moved apart.
Terminals
Bimetallic strip - separates contacts in response to smaller, longer-term overcurrents
Calibration screw - allows the manufacturer to precisely adjust the trip current of the device after assembly.
Solenoid - separates contacts rapidly in response to high overcurrents
Arc divider/extinguisher
Magnetic[edit]
Magnetic circuit breakers use a solenoid (electromagnet) whose pulling force increases with the current. Certain designs utilize electromagnetic forces in addition to those of the solenoid. The circuit breaker contacts are held closed by a latch. As the current in the solenoid increases beyond the rating of the circuit breaker, the solenoid's pull releases the latch, which lets the contacts open by spring action. They are the most commonly used circuit breakers.
Thermal-magnetic[edit]
Shihlin Electric MCCB with SHT
Thermal magnetic circuit breakers, which are the type found in most distribution boards, incorporate both techniques with the electromagnet responding instantaneously to large surges in current (short circuits) and the bimetallic strip responding to less extreme but longer-term over-current conditions. The thermal portion of the circuit breaker provides a time response feature, that trips the circuit breaker sooner for larger overcurrents but allows smaller overloads to persist for a longer time. This allows short current spikes such as are produced when a motor or other non-resistive load is switched on. With very large over-currents during a short-circuit, the magnetic element trips the circuit breaker with no intentional additional delay.[6]
Magnetic-hydraulic[edit]
A magnetic-hydraulic circuit breaker uses a solenoid coil to provide operating force to open the contacts. Magnetic-hydraulic breakers incorporate a hydraulic time delay feature using a viscous fluid. A spring restrains the core until the current exceeds the breaker rating. During an overload, the speed of the solenoid motion is restricted by the fluid. The delay permits brief current surges beyond normal running current for motor starting, energizing equipment, etc. Short-circuit currents provide sufficient solenoid force to release the latch regardless of core position thus bypassing the delay feature. Ambient temperature affects the time delay but does not affect the current rating of a magnetic breaker. [7]
Large power circuit breakers, applied in circuits of more than 1000 volts, may incorporate hydraulic elements in the contact operating mechanism. Hydraulic energy may be supplied by a pump, or stored in accumulators. These form a distinct type from oil-filled circuit breakers where oil is the arc extinguishing medium. [8]
Common trip breakers[edit]
Three-pole common trip breaker for supplying a three-phase device. This breaker has a 2 A rating.
When supplying a branch circuit with more than one live conductor, each live conductor must be protected by a breaker pole. To ensure that all live conductors are interrupted when any pole trips, a "common trip" breaker must be used. These may either contain two or three tripping mechanisms within one case, or for small breakers, may externally tie the poles together via their operating handles. Two-pole common trip breakers are common on 120/240-volt systems where 240 volt loads (including major appliances or further distribution boards) span the two live wires. Three-pole common trip breakers are typically used to supply three-phase electric power to large motors or further distribution boards.
Two- and four-pole breakers are used when there is a need to disconnect multiple phase AC, or to disconnect the neutral wire to ensure that no current flows through the neutral wire from other loads connected to the same network when workers may touch the wires during maintenance. Separate circuit breakers must never be used for live and neutral, because if the neutral is disconnected while the live conductor stays connected, a dangerous condition arises: the circuit appears de-energized (appliances don't work), but wires remain live and some residual-current devices (RCDs) may not trip if someone touches the live wire (because some RCDs need power to trip). This is why only common trip breakers must be used when neutral wire switching is needed.
Medium-voltage[edit]
Medium-voltage circuit breakers rated between 1 and 72 kV may be assembled into metal-enclosed switchgear line ups for indoor use, or may be individual components installed outdoors in a substation. Air-break circuit breakers replaced oil-filled units for indoor applications, but are now themselves being replaced by vacuum circuit breakers (up to about 40.5 kV). Like the high voltage circuit breakers described below, these are also operated by current sensing protective relays operated through current transformers. The characteristics of MV breakers are given by international standards such as IEC 62271. Medium-voltage circuit breakers nearly always use separate current sensors and protective relays, instead of relying on built-in thermal or magnetic overcurrent sensors.
Medium-voltage circuit breakers can be classified by the medium used to extinguish the arc:
Vacuum circuit breakers—With rated current up to 6,300 A, and higher for generator circuit breakers application ( up to 16,000 A & 140 kA). These breakers interrupt the current by creating and extinguishing the arc in a vacuum container - aka "bottle". Long life bellows are designed to travel the 6–10 mm the contacts must part. These are generally applied for voltages up to about 40,500 V,[9] which corresponds roughly to the medium-voltage range of power systems. Vacuum circuit breakers have longer life expectancy between overhaul than do other circuit breakers. In addition their Global Warming Potential is by far lower than SF6 circuit breaker.
Air circuit breakers—Rated current up to 6,300 A and higher for generator circuit breakers. Trip characteristics are often fully adjustable including configurable trip thresholds and delays. Usually electronically controlled, though some models are microprocessor controlled via an integral electronic trip unit. Often used for main power distribution in large industrial plant, where the breakers are arranged in draw-out enclosures for ease of maintenance.
SF6 circuit breakers extinguish the arc in a chamber filled with sulfur hexafluoride gas.
Medium-voltage circuit breakers may be connected into the circuit by bolted connections to bus bars or wires, especially in outdoor switchyards. Medium-voltage circuit breakers in switchgear line-ups are often built with draw-out construction, allowing breaker removal without disturbing power circuit connections, using a motor-operated or hand-cranked mechanism to separate the breaker from its enclosure. Some important manufacturer of vacuum circuit breakers from 3.3 kV to 38 kV are ABB, Schneider Electric, Eaton, Siemens, HHI (Hyundai Heavy Industry), S&C Electric Company, Jyoti and BHEL.
High-voltage[edit]
Main article: High-voltage switchgear
Three single phase Soviet/Russian 110 kV oil circuit breakers
400 kV SF6 live tank circuit breakers
72.5 kV hybrid switchgear module
Electrical power transmission networks are protected and controlled by high-voltage breakers. The definition of high voltage varies but in power transmission work is usually thought to be 72.5 kV or higher, according to a recent definition by the International Electrotechnical Commission (IEC). High-voltage breakers are nearly always solenoid-operated, with current sensing protective relays operated through current transformers. In substations the protective relay scheme can be complex, protecting equipment and buses from various types of overload or ground/earth fault.
High-voltage breakers are broadly classified by the medium used to extinguish the arc:
Bulk oil
Minimum oil
Air blast
Vacuum
SF6
CO2
Due to environmental and cost concerns over insulating oil spills, most new breakers use SF6 gas to quench the arc.
Circuit breakers can be classified as live tank, where the enclosure that contains the breaking mechanism is at line potential, or dead tank with the enclosure at earth potential. High-voltage AC circuit breakers are routinely available with ratings up to 765 kV. 1,200 kV breakers were launched by Siemens in November 2011,[10] followed by ABB in April the following year.[11]
High-voltage circuit breakers used on transmission systems may be arranged to allow a single pole of a three-phase line to trip, instead of tripping all three poles; for some classes of faults this improves the system stability and availability.
High-voltage direct current circuit breakers are still a field of research as of 2015. Such breakers would be useful to interconnect HVDC transmission systems.[12]
Sulfur hexafluoride (SF6) high-voltage[edit]
Main article: Sulfur hexafluoride circuit breaker
A sulfur hexafluoride circuit breaker uses contacts surrounded by sulfur hexafluoride gas to quench the arc. They are most often used for transmission-level voltages and may be incorporated into compact gas-insulated switchgear. In cold climates, supplemental heating or de-rating of the circuit breakers may be required due to liquefaction of the SF6 gas.
Disconnecting circuit breaker (DCB)[edit]
72.5 kV carbon dioxide high-voltage circuit breaker
The disconnecting circuit breaker (DCB) was introduced in 2000[13] and is a high-voltage circuit breaker modeled after the SF6-breaker. It presents a technical solution where the disconnecting function is integrated in the breaking chamber, eliminating the need for separate disconnectors. This increases the availability, since open-air disconnecting switch main contacts need maintenance every 2–6 years, while modern circuit breakers have maintenance intervals of 15 years. Implementing a DCB solution also reduces the space requirements within the substation, and increases the reliability, due to the lack of separate disconnectors.[14][15]
In order to further reduce the required space of substation, as well as simplifying the design and engineering of the substation, a fiber optic current sensor (FOCS) can be integrated with the DCB. A 420 kV DCB with integrated FOCS can reduce a substation’s footprint with over 50% compared to a conventional solution of live tank breakers with disconnectors and current transformers, due to reduced material and no additional insulation medium.[16]
Carbon dioxide (CO2) high-voltage[edit]
In 2012 ABB presented a 75 kV high-voltage breaker that uses carbon dioxide as the medium to extinguish the arc. The carbon dioxide breaker works on the same principles as an SF6 breaker and can also be produced as a disconnecting circuit breaker. By switching from SF6 to CO2 it is possible to reduce the CO2 emissions by 10 tons during the product’s life cycle.[17]
"Smart" circuit breakers[edit]
Several firms have looked at adding monitoring for appliances via electronics or using a digital circuit breaker to monitor the breakers remotely. Utility companies in the United States have been reviewing use of the technology to turn on and off appliances, as well as potentially turning off charging of electric cars during periods of high electrical grid load. These devices under research and testing would have wireless capability to monitor the electrical in a house via a smartphone app or other means.[18]
Atom Power, a company based in North Carolina, is also considering adopting "smart" circuit breakers for industrial applications, which may have greater benefits. Siemens has publicly said that the circuit breaker technology shows “great promise” for future applications.[18]
Other breakers[edit]
Residual current circuit breaker with overload protection
The following types are described in separate articles.
Breakers for protections against earth faults too small to trip an over-current device:
RCCB (Residual Current Operated Circuit-Breaker without Integral Overcurrent Protection) as a type of Residual-current device (RCD, formerly known as a residual current device) — detects current imbalance, but does not provide over-current protection. In the United States and Canada these are called ground fault circuit interrupters (GFCI).
Residual current breaker with over-current protection (RCBO) — combines the functions of an RCD and an MCB in one package. In the United States and Canada these are called GFCI breakers.
Earth leakage circuit breaker (ELCB) — This detects current in the earth wire directly rather than detecting imbalance. They are no longer seen in new installations as they cannot detect any dangerous condition where the current is returning to earth by another route - such as via a person on the ground or via plumbing. (also called VOELCB in the UK).
Recloser — A type of circuit breaker that closes automatically after a delay. These are used on overhead electric power distribution systems, to prevent short duration faults from causing sustained outages.
Polyswitch (polyfuse) — A small device commonly described as an automatically resetting fuse rather than a circuit breaker.
See also[edit]
Electronics portal
Arc-fault circuit interrupter
Ring Main Unit
Circuit total limitation (CTL)
Distribution board (Circuit breaker panel)
Earthing system
Hybrid switchgear module
Insulation monitoring device
Motor control center (MCC)
Network protector
Power distribution center (PDC)
Power system protection
Remote racking system
Sulfur hexafluoride circuit breaker
References[edit]
Jump up ^ Robert Friedel and Paul Israel, Edison's Electric Light: Biography of an Invention, Rutgers University Press, New Brunswick New Jersey USA,1986 ISBN 0-8135-1118-6 pp.65-66
Jump up ^ ""1920-1929 Stotz miniature circuit breaker and domestic appliances", ABB, 2006-01-09, accessed 4 July 2011". >
Jump up ^ Flurscheim, Charles H., ed. (1982). "Chapter 1". Power Circuit Breaker Theory and Design (Second ed.). IET. ISBN 0-906048-70-2.
Jump up ^ Weedy,, B. M. (1972). Electric Power Systems (Second ed.). London: John Wiley and Sons. pp. 428&ndash, 430. ISBN 0-471-92445-8.
Jump up ^ "What is an MCB and how does it work?". Consumer Unit World. 16 September 2016.
Jump up ^ John Matthews Introduction to the Design and Analysis of Building Electrical Systems Springer 1993 0442008740 page 86
Jump up ^ Hwaiyu Geng, Data Center Handbook, John Wiley & Sons,2014 page 542
Jump up ^ G R Jones (ed), Electrical Engineer's Reference Book, Butterworth - Heinemann Ltd, 1993, page 25/14
Jump up ^ A few manufacturers now offer a single-bottle vacuum breaker rated up to 72.5 kV and even 145 kV. See http://www3.interscience.wiley.com/journal/113307491/abstract?CRETRY=1&SRETRY=0 Electrical Engineering in Japan, vol 157 issue 4 pages 13-23
Jump up ^ "Siemens launches world's first 1200kV SF6 Circuit Breaker". Retrieved 14 November 2011.
Jump up ^ "ABB to develop ultra high voltage circuit breaker". Retrieved 14 August 2012.
Jump up ^ "High Voltage DC Switch Enables Supergrids for Renewable Energy, MIT Technology Review". Retrieved 19 July 2013.
Jump up ^ "Applications of Disconnecting Circuit Breakers, Michael Faxå, p.1" (PDF). Archived from the original (PDF) on 16 May 2013. Retrieved 9 July 2012.
Jump up ^ "HPL Disconnecting Circuit Breaker". Retrieved 9 July 2012.
Jump up ^ "Disconnecting Circuit Breakers, Buyer's and Application Guide, p. 10" (PDF). Retrieved 15 September 2014.
Jump up ^ "362 – 550 kV Disconnecting Circuit Breaker with FOCS: Small, smart and flexible, p.1". Retrieved 3 July 2013.
Jump up ^ "Switzerland: ABB breaks new ground with environment friendly high-voltage circuit breaker". Retrieved 7 June 2013.
^ Jump up to: a b "Smart circuit-breakers for energy-efficient homes". The Economist. Retrieved 2018-01-15.
General
BS EN 60898-1. Electrical accessories — Circuit breakers for over-current protection for household and similar installations. British Standards Institution, 2003.
Authority control
NDL: 00571798
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text:
List of Andi Mack episodes
From Wikipedia, the free encyclopedia
Jump to: navigation, search
Andi Mack is an American comedy-drama television series created by Terri Minsky that premiered on Disney Channel on April 7, 2017. The series stars Peyton Elizabeth Lee, Joshua Rush, Sofia Wylie, Asher Angel, Lilan Bowden, and Lauren Tom.
Contents
[hide]
1 Series overview
2 Episodes
2.1 Season 1 (2017)
2.2 Season 2 (2017–18)
3 References
Series overview[edit]
Season
Episodes
Originally aired
First aired
Last aired
1 12 April 7, 2017 (2017-04-07) June 23, 2017 (2017-06-23)
2 TBA October 27, 2017 (2017-10-27) TBA
Episodes[edit]
Season 1 (2017)[edit]
No.
overall
No. in
season
Title [1][2]
Directed by
Written by
Original air date [1][2]
Prod.
code [1][3]
U.S. viewers
(millions)
1
2
1
2 "13"
"Outside the Box" Paul Hoen Terri Minsky April 7, 2017 (2017-04-07) 101
102 1.24[4]
As Andi Mack celebrates her 13th birthday, she gets a surprise visit from her sister, Bex, who announces she will be moving back in with their parents, Celia and Ham. Andi is thrilled about the news and wants to know what Bex has been up to. Bex shares a box of her memories with Andi, though before she does, Celia warns her about the secrets inside it which she does not want Andi to know. Bex later discovers Andi is infatuated with a boy named Jonah Beck and arranges to have her be with him, which includes a frisbee lesson with him. Jonah realizes how good Andi becomes and wants her to join the frisbee team at school, but as she decides whether to do so, she discovers he has a girlfriend named Amber. Feeling humiliated, Andi gets upset at Bex, who tells her it is okay not to be perfect. Andi feels better after Jonah texts her. Meanwhile, against Celia's warning, Bex shows Andi a picture hidden deep inside the box which shows Andi as a baby and Bex holding her; Andi finds out the truth about her sister, who is really her mother. This infuriates Celia and Ham, but they know they must come to terms with this revelation. After taking time to process this huge change in her life, Andi eventually becomes curious about who her father is, but Bex is not ready to tell her yet. It prompts Andi to take the box to see whether her father's picture is inside it.
Andi tells her friends, Cyrus and Buffy, that she has joined the school frisbee team with Jonah, but has yet to tell them about the more important, life-changing discovery concerning her and Bex. While hanging with Andi in her shack, Cyrus and Buffy come across the picture of Bex with the newborn Andi, concluding Bex has a "secret baby", but not knowing that baby is Andi. Meanwhile, Bex tries to fit in at dinner when Andi, Celia and Ham play a memory game during the meal. Andi tries to impress Jonah by giving him a bracelet she made, a gesture which upsets Amber as she sees the two together. Later, when Cyrus and Buffy keep harping about the secret baby, Andi reveals to them that she is the secret baby while also telling them that Amber is wearing the bracelet she gave to Jonah. Both Andi and Amber stare at each other for several minutes, diverting the attention away from the secret baby talk. Cyrus and Buffy eventually get back to Andi's revelation and have some questions about it.
Guest stars: Stoney Westmoreland as Ham, Emily Skinner as Amber, Anson Bagley as Gus
Note: Disney Channel premiered these episodes as part of a double-length special episode titled "Tomorrow Starts Today", but they have subsequently been aired and sold as separate regular-length episodes titled "13" and "Outside the Box".
3
3 "Shhh!" David Warren Erin Dunlap April 14, 2017 (2017-04-14) 103 1.19[5]
Since the revelation that Bex is Andi's mother, Celia still does not want Andi to call her by different grandmother names. After seeing Mrs. Devlin is the librarian at Andi's school, and recalling that has not changed since she went there, Bex encourages Andi into watching scary movies, which Celia has kept Andi from experiencing. That evening, Andi watches a movie called Shhh!, with Bex there in case she gets too scared, though Bex ends up falling asleep. The movie indeed scares Andi so much, that the next day, she falls asleep in class and receives detention, which prevents her from attending her first Space Otters frisbee match with Jonah. Andi finds out detention is held in the library with Mrs. Devlin, whose "shhh" to quiet her winds up re-triggering her frightened state from the movie. Meanwhile, Buffy joins the track and field relay team and her obsession with winning becomes costly. Later, as Bex goes through a box of things from her youth, and Andi learns more about her, Andi also stumbles across a picture of someone from Bex's past whom she believes to be her father.
Guest star: Chelsea T. Zhang as Brittany
4
4 "Dancing in the Dark" Paul Hoen Phil Baker April 21, 2017 (2017-04-21) 104 1.27[6]
After Andi questions Bex about the identify of the man in the photo she found, Bex is hesitant and continues to avoid discussion about Andi's father. Cyrus reveals the truth about Bex being Andi's mother to his mother, who later spreads the word across town. Andi receives supportive comments from Jonah and a lot of students at her school, while Celia has an even harder time coping with this fact after her neighbor calls her "grandma", which leads her and Ham to take time away from home. In their absence, Bex persuades Andi to have her first party at the house. The party is attended by Andi's schoolmates, Jonah, and even Amber. It turns bad when Amber wants to know who Andi's real father is and asks Andi to reveal him to the guests, causing Andi to retreat to the Andi Shack. As Bex starts to talk to Andi, Cyrus warns them that Celia and Ham have returned, and the partygoers are told to leave. During the confrontation, Celia is angered at what happened and walks off without saying anything. Ham sends Andi to bed while he helps Bex clean up. As Andi heads to her bedroom, Ham comments to Bex that they came home upon the Neighborhood Watch contacting them about party music that normally does not come from their home. When Bex tells him that Andi is persistent with questions about her father, Ham tells Bex that the man who fathered Andi knows she exists because he told him.
Guest stars: Stoney Westmoreland as Ham, Emily Skinner as Amber, Chelsea T. Zhang as Brittany, Garren Stitt as Marty
5
5 "It's Not About You" Joe Menendez Rayna McClendon April 28, 2017 (2017-04-28) 105 1.40[7]
Bex is shocked that Ham informed Andi's father about Andi, but Ham made it clear that he needed to know and Andi needs to know about him. When Andi later questions Ham about her father, however, she gets no information. Although Ham has given Bex the email address of Andi's father, all that comes out of any communication is "hey".
Meanwhile, Jonah sets up Cyrus on a date with a girl named Iris, as part of a double date with Jonah and Amber. However, it goes sour when Cyrus gets sick on a carnival ride.
Buffy gets into trouble at school over her curly hair and is told by the vice-principal to change it. This leads to her not hanging out with Andi, who starts asking questions after she sees Buffy and Bex talking at the Fringe. It boils over when Andi sees the two in the bathroom at home, but she finds out none of what is going on is about her. Buffy reveals to Andi that she messed up her hair while using a flatiron to straighten it and she went to Bex to have her hair fixed, since Buffy's mother is overseas.
Andi later gives Bex a lesson on how to properly throw a frisbee. After Bex lets one fly, Andi goes to retrieve it and then sees Amber with a guy, but it is not Jonah.
Guest stars: Stoney Westmoreland as Ham, Emily Skinner as Amber, Molly Jackson as Iris
Absent: Lauren Tom as Celia Mack
6
6 "She Said, She Said" Paul Hoen Suzanne Weber May 5, 2017 (2017-05-05) 106 1.41[8]
Andi is faced with telling Jonah about seeing Amber with another guy, and after she does, Jonah tells her he will be okay. When she later receives texts to see him at his school locker, Andi rushes to meet him, but also confronts Amber, who actually sent out the texts from Jonah's phone and makes her to be a liar. Hurt by Amber's treatment, Andi questions whether she should be talking to Jonah, even though he feels bad about what happened. She is so hurt, that she wants to stay home from school and gets help from Cyrus and Buffy to make her sick.
Meanwhile, Celia sees Bex is becoming more responsible around the house and later notices her working at the Fringe. Celia also notices Brittany, whom Bex babysat years ago, is Bex's boss.
While running track, Buffy meets a familiar face from Andi's party, Marty, who informs her that she is the fastest runner at school, for a girl. She finds herself in competition with Marty, who has the school's overall fastest time.
As Andi, Bex and Celia argue over Andi's going to school, they hear the doorbell. Bex answers to find a man at the door; it is Andi's father, Bowie. Bex introduces the two, informing them of their relationship, and they look at each other in surprise.
Guest stars: Emily Skinner as Amber, Chelsea T. Zhang as Brittany, Garren Stitt as Marty, Trent Garrett as Bowie
7
7 "Dad Influence" Jerry O'Connell Elena Song May 12, 2017 (2017-05-12) 107 1.49[9]
Bowie is excited to know his daughter, Andi, by spending the day with her, but Celia reminds them it is a school day. Bowie manages to get Andi excused from school, right after she learns from Cyrus and Buffy that Jonah and Amber have broken up, and Jonah approaches her with news she hopes is good. When Cyrus and Buffy later realize Andi is not around, they text her to ask where she is and what Jonah told her, but Andi is wondering as much about Jonah and asks her friends to find out. They end up meddling instead, with Cyrus convincing Jonah to follow his heart, despite his insecurities from the break-up, hoping it will lead him to Andi. Meanwhile, Bowie makes the most of his day with Andi, but when she worries about Jonah, Bowie drives her back to school. After she discovers Jonah and Amber have reconciled, she asks Cyrus and Buffy how this could happen, but the two keep silent about their involvement. Andi also tells them she spent the day with her father, while feeling guilty about cutting their day short, realizing he had only the one day, since he is a traveling musician. After Andi talks with Bex about Bowie and learns more about their relationship, the two discover Bowie in Andi's shack.
Guest stars: Stoney Westmoreland as Ham, Emily Skinner as Amber, Trent Garrett as Bowie
8
8 "Terms of Embarrassment" Adam Weissman Sam Wolfson May 19, 2017 (2017-05-19) 108 1.48[10]
Bowie decides to delay joining his 40-city tour with the Renaissance Boys to be with Andi and Bex, but Celia allows him to stay at the Mack house for only two days. During his extended stay, Bowie meets Andi's friends at school and her teammates on the Space Otters. He records a video with them in it and asks Andi about the boy she keeps talking about, but she feels uncomfortable about her father being around her all the time. On the other hand, Celia is having a change of heart about Bowie after he cooks one of her mother's recipes. Bex and Bowie later have a serious talk at the place the two were last together before their split, with Bowie wanting to be in Andi and Bex's lives more; Bex assures him that he is already a part of their lives. Meanwhile, Cyrus gets offended over a text from Jonah which called him "girly". Buffy works on making Cyrus more like a man, but when Cyrus later asks Jonah about the text, Jonah tells him that auto-correct messed up the text and he really meant to send "gnarly".
Bowie starts to realize he has overstayed his welcome after Andi catches him in her bedroom on her computer and wants him not to invade her privacy. When Bex looks at Andi's computer, she sees the video that Bowie made and gets emotional. That prompts Andi to take a look as well and to talk with Bowie afterward, only to find him gone.
Guest stars: Stoney Westmoreland as Ham, Trent Garrett as Bowie
9
9 "She's Turning into You" Michael Grossman Erin Dunlap June 2, 2017 (2017-06-02) 109 1.41[11]
Andi misses Bowie, and Bex helps to cheer her up. The two buy a variety of vintage clothes, which Celia disapproves and causes her to start questioning Bex's being back home. After enjoying quality time with Bex, Andi begins to wonder why her mother left home at the time of her birth, and while Bex does not reveal any details to Andi, things come out at home when Celia suggests that Bex moves out.
Meanwhile, Andi is concerned after Jonah passes her in the hallway at school without saying anything. She talks to him to find things are still okay between them. She also offers to help him come up with something for Amber's birthday, including how to express his emotions on her birthday card, but Andi is taken aback when Jonah thinks of her as a "pal" instead of something more.
Buffy's competitive nature hits a new low when she discovers one of her track shoes is missing and assumes Marty stole it. She retaliates by taking Marty's shoes and inflicting water damage on them. As for the missing shoe, Cyrus reveals it was in his mother's car, coming out of Buffy's bag during one of her rides home with him.
The episode concludes with Andi and Bex moving into a new apartment.
Guest star: Garren Stitt as Marty
10
10 "Home Away from Home" Eyal Gordin Phil Baker June 9, 2017 (2017-06-09) 110 1.29[12]
Andi and Bex struggle with adjusting to their new home, and problems with the electricity and appliances are making matters worse. Andi has been removed from the home she has known for 13 years, and it is taking a toll, from issues about her laundry and the warm meals to her ability to work on her art. With her crafting supplies in the Andi Shack, she and Bex head back to the Mack house to retrieve them. Celia and Ham notice the two and are willing to welcome them back into their home, but Bex stands by her decision to move out, though she does apologize to Celia for taking Andi without giving her any notice. Ultimately, as Andi's mother, Bex begins to realize what is best for Andi and allows her to go back to Celia and Ham. After Celia returns Andi to be in her new home with Bex, Andi starts to embrace Bex as her mother.
Meanwhile, Cyrus wonders where he stands with Iris, thinking their relationship is over. Intending to spend the day at a sporting event with her, Jonah and Amber, he winds up going with just Jonah after Buffy declines to be his date and the other girls think he has moved on.
Guest star: Stoney Westmoreland as Ham
11
11 "Were We Ever?" Paul Hoen Sam Wolfson June 16, 2017 (2017-06-16) 111 1.38[13]
A new principal, Dr. Metcalf, takes over at Andi's school. He meets Andi, Cyrus and Buffy, and tells Andi her leggings violate the school's dress code. Unaware at first about this dress code, the three eventually object to it when they see all the clothing prohibited. With Bex's help, they stage a protest at the school, with the participating students wearing prison outfits. As this is also happening on picture day, Cyrus gets concerned over how he will look, but Buffy convinces him to go with what they are wearing. Jonah reminds Andi about the team picture for the Space Otters, but when she shows up, he does not see her in the team's uniform and tells her to change into it. With Jonah so focused on the picture, Andi quickly realizes his indifference to her standing up to the dress code—a fight she wins after negotiating with Dr. Metcalf about making the policy more reasonable. Andi and her friends later find out the school will redo picture day in light of the protest.
Andi and Jonah have a more serious talk about what has happened, leading her to quit the Space Otters. She stands up to Jonah, wanting him to stop asking her to do things for him. When Jonah asks if they are still friends, Andi responds, "Were we ever?"
Guest star: Oliver Vaquer as Dr. Metcalf
Absent: Lauren Tom as Celia Mack
12
12 "Best Surprise Ever" Vanessa Parise Elena Song & Suzanne Weber June 23, 2017 (2017-06-23) 112 1.94[14]
Jonah is feeling down following Andi's quitting the Space Otters and all but ignoring him after their talk. Even Amber cannot cheer him up, with her friend Kip belittling the sport he loves. Cyrus encourages Jonah to talk to Andi, but when it appears Jonah will have a chance to do so in the school hallway, he notices Andi's excitement about Bowie's return instead. Jonah becomes so depressed that he cancels the Space Otters practice. This also leads to his unequivocal break-up with Amber.
Meanwhile, Buffy gives Marty a new pair of shoes, her way of apologizing for what she did to his old ones, though Marty has wanted her to actually say she is sorry. They set a time to race each other to resolve who is faster, but when they worry about how they will react to the result, they call the race off.
Andi discovers the reason Bowie came back is tied to Bex, whom he noticed in pictures across several stops on his tour with the Renaissance Boys. Andi arranges for her parents to have a romantic evening, and she also hears a song Bowie wrote for Bex. The next morning, Andi asks Bex how the evening went and hopes the two will get back together, but Bex tells Andi it is unlikely because Bowie's unpredictability makes him inclined not to stay in one place. When Andi talks to Bowie, she realizes his feelings for Bex have changed little over the years, but Bowie agrees with what Bex told Andi. Still, there is hope when Andi sees Bowie unexpectedly take a ring out of one of the blazers he is trying on at a vintage store.
Guest stars: Emily Skinner as Amber, Trent Garrett as Bowie, Garren Stitt as Marty, CJ Strong as Kip
Absent: Lauren Tom as Celia Mack
Season 2 (2017–18)[edit]
No.
overall
No. in
season
Title [1][2]
Directed by
Written by
Original air date [1][2]
Prod.
code [1][15]
U.S. viewers
(millions)
13
1 "Hey, Who Wants Pizza?" Eyal Gordin Terri Minsky October 27, 2017 (2017-10-27) 2-99 1.62[16]
Andi talks to Bowie about proposing to Bex, while Cyrus introduces his girlfriend Iris to Andi and Buffy, and Jonah invites Andi, Cyrus and Buffy to a pizza party for the Space Otters. At first, Andi does not want to go to the party, but later changes her mind after talking with Bex. Following the party, Jonah reveals to Andi that he broke up with Amber for good, though Andi had some idea prior to the party when he returned the bracelet she made for him. Andi gives Jonah back the bracelet and gets serious about being with him.
While Cyrus is happy about seeing Andi and Jonah together again, as well as having Iris as his girlfriend, he reveals to Buffy that he is also unhappy. He confides in her that he is jealous because of his feelings for Jonah.
Bowie comes over to Andi and Bex's apartment with a pizza and, with Andi's help, finally asks Bex to marry him. Bex's response is simply "um...", but Andi is hopeful she will eventually say yes. Later, while at work, Bex receives another pizza from Bowie, who is also hopeful she will accept his proposal.
As Andi and her friends discover Amber as a waitress at The Spoon, Andi tells Buffy about how that is making her uncomfortable but also how nervous she is around Jonah. Buffy thinks Andi is not ready for a serious relationship yet. While the two are talking, Jonah is with Amber outside, which further upsets Andi. Although Jonah says nothing is going on, Buffy warns him not to hurt Andi, causing him to leave the diner. Andi later talks to Jonah and wants their relationship to grow without Amber standing in the way.
After having some time to think about Bowie's proposal, Bex reveals to Andi that she is not going to marry him.
Guest stars: Stoney Westmoreland as Ham, Trent Garrett as Bowie, Emily Skinner as Amber, Chelsea T. Zhang as Brittany, Molly Jackson as Iris
14
2 "Chinese New Year" Eyal Gordin Elena Song November 3, 2017 (2017-11-03) 202 1.66[17]
Andi is disappointed about Bex saying no to Bowie's marriage proposal and wants Bex to tell Bowie as soon as possible, as he is unaware. With the approach of the Chinese New Year, and Andi and Bex's aunt Mei and cousin Ronald coming over to Celia's house, the news will have to wait. Andi invites Jonah to the new year event, but his not understanding the customs puts Celia on edge, as well as the idea of Andi even having a boyfriend. Meanwhile, Celia wants to show Mei that she can successfully host a Chinese New Year feast and is quite appreciative of Bowie's contributions for the occasion. After Bowie announces that he may have some good news to share, Celia uses the opportunity to make the event special, until Andi hints to Bowie what she already knows and announces to the rest that Bex and Bowie are not getting married. Bowie is saddened by this and leaves.
With track season over, Buffy decides to sign up to play basketball, though the school's team consists only of men. After some practice with Marty, Buffy lets him know how confident she is of making the team, despite her actually being nervous. She feels she needs to outperform the men to secure a spot.
Andi continues to be upset that Bex let Bowie go, but when finding something to eat, she rediscovers that picture which Bex tore up, making her even more upset. She wants to know whether the person in that picture is the reason behind Bex's decision not to marry Bowie.
Guest stars: Freda Foh Shen as Mei, Stoney Westmoreland as Ham, Trent Garrett as Bowie, Garren Stitt as Marty, Alan Ko as Ronald
15
3 "Friends Like These" Adam Weissman Phil Baker November 10, 2017 (2017-11-10) 203 1.40[18]
Andi grows suspicious when Amber starts having a normal conversation with her. Jonah tells Andi that Amber just wants to be friends, but Andi thinks Amber has not gotten over Jonah. Andi, Cyrus and Buffy try another hangout place to avoid Amber at The Spoon.
Meanwhile, Buffy and Marty go through tryouts to make the basketball team, but Buffy gets annoyed by TJ, the team's captain. Despite feeling she will not make the team because of him, Buffy shares the good news with Andi and Cyrus when she does. Marty fails to make the team but is happy for Buffy.
Cyrus and Iris spend an evening together at her house and watch a movie. Things appear to go all right until he kisses her, after which he feels embarrassed by the way it happened and decides to leave.
Andi finds out more about the man in the picture Bex tore up, an ex-boyfriend named Gabriel. Bex has trouble letting him go and tells Andi he is the reason she is insecure about marrying anyone, including Bowie. Andi helps Bex find closure with Gabriel by placing his picture with those of her other ex-boyfriends in her box of memories, which leads to them taking out Bowie's picture.
Guest stars: Emily Skinner as Amber, Garren Stitt as Marty, Molly Jackson as Iris, Luke Mullen as TJ
Absent: Lauren Tom as Celia Mack
16
4 "Mama" Eyal Gordin Terri Minsky November 17, 2017 (2017-11-17) 204 1.58[19]
Celia informs Andi and Bex about a closet clean-out at the Mack house, which happens to be on the anniversary of a day Bex wishes had never happened—the day she left 13 years earlier. Both Bex and Celia tell their versions of the story behind that day to Andi, which are completely different. Bex eventually reveals that her leaving was tied to Andi's first word as a baby, "mama", which was directed at Celia. Upon hearing that, Andi feels regret that she caused Bex to leave. Bex tells Andi that her decision was for the best as she wanted her to be happy, and Celia is thankful for the sacrifice Bex made to ensure Andi would be raised in a stable environment.
Meanwhile, Jonah teaches Cyrus how to skateboard, but when Cyrus is unable to control the skateboard's movement, he ends up getting hurt and going to the hospital. Buffy becomes a friend to her neighbor Millie through a community service project she is doing for school.
Later, Celia reveals to Bex that the clean-out was about more than their opportunity to reconcile about that day 13 years ago. She plans to sell the house and leaves it to Bex to tell Andi, news which will devastate her particularly because of AndiShack. Bex delays saying anything about it to Andi.
Guest stars: Stoney Westmoreland as Ham, Juliet Mills as Millie
17
5 "The Snorpion" Eyal Gordin Erin Dunlap November 24, 2017 (2017-11-24) 205 1.18[20]
After overhearing part of a phone conversation Amber is having with her father, Andi decides to spend time with her by inviting her to a sleepover. Having warned Andi before about Amber by comparing her to a snake in one story, Buffy relays another story to Andi about a frog and a scorpion, and compares Amber to the scorpion—leading to the term "snorpion". At the sleepover, Amber tells Andi that her father lost his job, which is why she is working at The Spoon. With Andi enjoying Amber's company, the two decide to sneak out to an amusement park, where Amber convinces Andi to ride the ferris wheel. When Amber sees a call from Jonah on Andi's phone, she becomes furious and leaves Andi stranded. This lands Andi in police custody, and Bex and Bowie are left to discipline her after they get home, though Andi ends up deciding her punishment when they cannot come up with one. Meanwhile, Buffy is upset over her teammates not giving her the ball during a basketball game. When she confronts TJ about what she needs to do to change this, she realizes he simply does not want her on the team at all. Also, Bex is working toward her cosmetology certification. Her makeup skills also help Andi fool Amber by thinking that Andi injured herself trying to get down the ferris wheel.
Guest stars: Emily Skinner as Amber, Trent Garrett as Bowie, Luke Mullen as TJ
Absent: Lauren Tom as Celia Mack
18
6 "I Wanna Hold Your Wristband" Joe Menendez Sam Wolfson December 1, 2017 (2017-12-01) 206 1.45[21]
Andi is nervous about holding hands with Jonah at school, but just as she is about to, the principal, Dr. Metcalf, splits the students into two separate groups, with Andi and Cyrus in group A, and Buffy and Jonah in group B. When Andi figures out that her group has luxuries while Jonah's group struggles over what they are dealt, she decides to switch groups and encourages the rest in her group to do the same, despite Dr. Metcalf's order for the two groups to stay separate. After chaos ensues in the cafeteria over cookies, Dr. Metcalf ends his exercise, getting across to the students that what group they belong in does not give them any advantage or disadvantage. He also asks them how he decided what group they went to, and while Andi contends it was random, she realizes his selections were alphabetically based. The school day ends with Andi and Jonah both holding hands, though Jonah admits having sweaty palms like Andi. When Andi returns home, Bex finally tells her that Celia and Ham are selling the house. The news devastates Andi, prompting her to return to AndiShack.
Guest stars: Trent Garrett as Bowie, Oliver Vaquer as Dr. Metcalf, Anson Bagley as Gus
19
7 "Head Over Heels" Joe Menendez Erin Dunlap January 15, 2018 (2018-01-15) 207 1.31[22]
To help Andi take her mind off of Celia and Ham's plans to sell the Mack house, Jonah asks her on a date by inviting her to a virtual reality arcade. Buffy is also invited, but she brings Marty with her so she does not feel like a third wheel, making the occasion a double date, even though the two are not really dating. During his virtual reality adventure, Jonah slips and gets hurt. When Jonah refuses Andi's aid, she worries that he is upset with her after she briefly laughed at his mishap. Andi continues to worry and feels Jonah is avoiding her when she later gets no response to her texts. Despite Jonah denying that he is upset with her after she asked him twice, Andi turns to Bex, who tells her to ask a third time. Andi becomes frustrated waiting for Jonah at school, but when she finally has the chance, she trips and falls as she approaches him to ask the question again. Jonah briefly laughs but assures Andi that he is not upset with her. Meanwhile, Buffy feels comfortable being just friends with Marty but finds out he wants more in their relationship. Also, Cyrus asks Bex for her opinion about a screenplay he has written, but Bex's hesitation to tell him the truth about the script has him setting his sights on making the movie.
Guest stars: Garren Stitt as Marty, Chelsea T. Zhang as Brittany
Absent: Lauren Tom as Celia Mack
20
8 "There's a Mack in the Shack" Paul Hoen Elena Song January 19, 2018 (2018-01-19) 208 1.28[23]
Andi decorates her shack with numerous paper cranes, hoping Celia and Ham will notice and change their mind about selling the house. While talking with Celia, Andi springs a deal of coming over to the house more often, news which delights Celia to the point of allowing Andi to choose her breakfast or dance to loud music. Celia even invites Andi to a tape tunnel exhibit which has her missing school and worrying Bex. When Ham finds out the true reason Andi has been spending more time at the house, he wonders why Celia did not fill him in, but when Bex comes up with a better idea to save Andi Shack, and Celia and Ham explain their plans of seeing the world, Andi begins to accept that selling the house may not be a bad idea. It turns out Celia and Ham need more time to decide where they will live, so they postpone selling the house.
Meanwhile, Buffy is asked by her math teacher to tutor a failing student. She bails when she discovers it is TJ, but as he is in jeopardy of being kicked off the basketball team, she will help him if, in return, he starts passing the ball to her during games. Also, Cyrus struggles with getting his chocolate chip muffin at school, but as another concession to Buffy, TJ gives Cyrus tips on claiming it.
After Andi, Bex and Celia have fun at a dance class Celia is taking, the three stop at The Spoon. Just as they are about to order some food, Andi sees Jonah enter the diner with a girl named Natalie.
Guest stars: Stoney Westmoreland as Ham, Luke Mullen as TJ, Shelby Simmons as Natalie
21
9 "You're the One That I Want" Paul Hoen Phil Baker January 26, 2018 (2018-01-26) 209 1.28[24]
Andi finds out from Jonah that Natalie heads the ultimate frisbee team for another school in town, but is wary after Jonah says that Natalie is "just a friend". Amber warns Andi that while she was dating Jonah, he used the same words to refer to Andi. Buffy and Cyrus spy on both Jonah and Natalie at a gathering with "Furious George", one of the top ultimate discheads in the world, but cannot find anything that would make the two more than just friends. Meanwhile, Andi and Jonah have plans to go on a school trip to a Grease singalong, which Buffy and Cyrus are also attending, but Andi learns Jonah has been asked to take part in a video with Natalie and "Furious George", though Jonah says he can get out of it. Unsure whether he does, Andi races over to where the video is being shot, only to hear from Natalie that Jonah is going to the singalong, so she races back to catch the bus, which she almost misses.
Bex meets a woman named Miranda, who works at the same plant nursery Bowie does. When Miranda decides she wants to ask Bowie out and wonders how much Bex knows about him, Bex appears supportive, yet uncomfortable.
Guest stars: Emily Skinner as Amber, Trent Garrett as Bowie, Shelby Simmons as Natalie, Chloe Hurst as Miranda
Absent: Lauren Tom as Celia Mack
22
10 "A Good Hair Day" Paul Hoen and Adam Weissman Suzanne Weber February 2, 2018 (2018-02-02) 210 1.21[25]
While Andi and Bowie are having breakfast at The Spoon, Andi discovers from Bowie's driver's license that it is his birthday. Bowie does not want to make a big deal out of it, but Andi wants to throw him a huge surprise party at Celia and Ham's place. She has Bex work out the details, while she attends a Renaissance Festival for most of the day with her friends. Bex sees Bowie at work and tries to get him to Celia and Ham's for a "plant emergency", but Bowie realizes she is trying to get him to the surprise party. Bex finds out the reason Bowie is not in a celebrating mood, as his father's birthday was on the same day but he died three years ago. Despite this, Bex encourages Bowie to come to the party for Andi's sake. He does and has a wonderful time, but he is greatly touched after Andi calls him "dad" for the first time.
Meanwhile, Buffy shows Jonah her competitive side in arm wrestling, where he also matches quite well, and later at the Renaissance Festival, they square off in a medieval-style tug o' war, which ends in a draw. Also, Cyrus tries to tell Iris about his true feelings for her, with Iris figuring out he does not like her like a girlfriend; the two are okay being just friends.
Guest stars: Stoney Westmoreland as Ham, Trent Garrett as Bowie, Molly Jackson as Iris
23
11 "Miniature Gulf" Paul Hoen Suzanne Weber February 9, 2018 (2018-02-09) 211 1.14[26]
While Andi, Bex and Bowie are playing miniature golf, Bowie receives a phone call and Andi wonders who he is talking to. Sensing the body language from both of her parents, Andi is sure Bowie is seeing someone and tries to get information about it. Eventually, she finds out Bowie is dating Miranda and wants to meet her, but Bowie says it is too soon. Andi later has second thoughts about seeing Miranda because it may be too much for her to have possibly another parent-figure. When Andi and Bex go miniature golfing again, by themselves, Andi spots Bowie with Miranda and a little girl, whom she deduces is Miranda's daughter. Meanwhile, Cyrus is tapped by Dr. Metcalf to make an orientation video for new students of Jefferson Middle School and has Jonah film him, but Cyrus gets nervous in front of the camera. Also, Buffy's tutoring TJ gets nowhere as she realizes he is having difficulty even with basic math.
Guest stars: Trent Garrett as Bowie, Luke Mullen as TJ, Chloe Hurst as Miranda, Eden Grace Redfield as Morgan
Absent: Lauren Tom as Celia Mack
24
12 "We Were Never" Michelle Manning Sam Wolfson February 16, 2018 (2018-02-16) 212 1.37[27]
Andi notices Jonah is not wearing the bracelet she gave him because it is falling apart. She offers to fix it, but Jonah tells her "no rush". After Celia and Ham sense something is wrong with Andi, Celia has Andi consult the I Ching and discovers her hexagram is one of a serious nature; Andi is left to interpret what that means.
Bex receives her cosmetology certificate and delivers the speech at her graduation. Celia and Ham attend the ceremony, and while Bex is shocked they are there after telling Andi not to invite them, she is pleased when they say they are proud of her.
Cyrus prepares for his bar mitzvah and has Jonah look over his wardrobe of suits. TJ is desperate to get his math homework done ahead of a basketball game, by attempting to cheat when he asks Buffy to do it for him. At the basketball game, TJ continues his stubbornness of not passing the ball to Buffy, but when he finally does, Buffy gets a huge surprise from her mother, who is briefly home from a tour of duty and appears at the game.
After Andi fixes the bracelet, Jonah tells her that it represents the two being "boyfriend" and "girlfriend", and he does not want to wear it because he is not into labels. This devastates Andi, and after she reflects on what Jonah has done for her, she feels they were never together in the first place.
Guest stars: Stoney Westmoreland as Ham, Luke Mullen as TJ, Siena Goines as Pat Driscoll
25
13 "Cyrus' Bash-Mitzvah!" Paul Hoen Terri Minsky February 23, 2018 (2018-02-23) 213 1.39[28]
Andi continues to be troubled by Jonah when he avoids her during Cyrus' bar mitzvah and party. Cyrus tells Andi that Jonah has not actually broken up with her, but she feels otherwise. Andi also finds out Cyrus' secret concerning Jonah, which only Buffy had known.
Later at the party, Andi, Cyrus and Buffy see a fortune teller and discover one thing about each of their futures. Buffy is the most disturbed about what she finds out and hopes it will not come true, about her mother being deployed again. After Buffy confirms her mother is home for a while, she returns to the fortune teller, who reminds her about the whole vision, which suggests she is moving.
Andi wonders about having a real boyfriend, and the fortune teller indicates she will, soon. Cyrus and Buffy think it is Jonah, but Andi is not ready to talk to him. She starts spending time with Walker, a caricature artist at the party who gives her a beautiful picture he has drawn of her. Jonah becomes jealous, not knowing who this guy is, and when he asks Cyrus and Buffy about him, they have no clue either. Andi and Jonah finally talk about what is going on, but after Andi says her feelings for him have changed, Jonah suffers a panic attack. After the party, Jonah comes over to Andi's place and despite his opposition to labels, he asks her if she will be his girlfriend, to which she replies, "um...".
Meanwhile, Bowie works on discussing Miranda with both Andi and Bex. Despite his new relationship, he tells Andi, in writing he jotted down on a napkin during the party, that he could live without the "universe", but not her.
Guest stars: Stoney Westmoreland as Ham, Trent Garrett as Bowie, Luke Mullen as TJ, Darius Marcell as Walker, Peggy Ann Blow as Madame Le Doux, Danny Jacobs as Norman
Note: Before the "Mack Chat" that followed this episode, Asher Angel and Trent Garrett did a "Be Inspired" PSA about what to do if someone has a panic attack.
References[edit]
^ Jump up to: a b c d e f "Andi Mack Episode Listings". The Futon Critic.
^ Jump up to: a b c d "Andi Mack". Zap2it.
Jump up ^ "Andi Mack Episodes". Disney ABC Press. Archived from the original on September 12, 2017.
Jump up ^ Mitch Metcalf (April 10, 2017). "Top 150 Friday Cable Originals & Network Finals: 4.7.2017". Showbuzz Daily. Retrieved April 10, 2017.
Jump up ^ Mitch Metcalf (April 17, 2017). "Top 150 Friday Cable Originals & Network Finals: 4.14.2017". Showbuzz Daily. Retrieved April 17, 2017.
Jump up ^ Mitch Metcalf (April 24, 2017). "Top 150 Friday Cable Originals & Network Finals: 4.21.2017". Showbuzz Daily. Retrieved April 24, 2017.
Jump up ^ Mitch Metcalf (May 1, 2017). "Top 150 Friday Cable Originals & Network Finals: 4.28.2017". Showbuzz Daily. Retrieved May 1, 2017.
Jump up ^ Mitch Metcalf (May 8, 2017). "Top 150 Friday Cable Originals & Network Finals: 5.5.2017". Showbuzz Daily. Retrieved May 8, 2017.
Jump up ^ Mitch Metcalf (May 15, 2017). "Top 150 Friday Cable Originals & Network Finals: 5.12.2017". Showbuzz Daily. Retrieved May 15, 2017.
Jump up ^ Mitch Metcalf (May 22, 2017). "Top 150 Friday Cable Originals & Network Finals: 5.19.2017". Showbuzz Daily. Retrieved May 22, 2017.
Jump up ^ Mitch Metcalf (June 5, 2017). "Top 150 Friday Cable Originals & Network Finals: 6.2.2017". Showbuzz Daily. Retrieved June 5, 2017.
Jump up ^ Mitch Metcalf (June 12, 2017). "Top 150 Friday Cable Originals & Network Finals: 6.9.2017". Showbuzz Daily. Retrieved June 12, 2017.
Jump up ^ Mitch Metcalf (June 19, 2017). "Top 150 Friday Cable Originals & Network Finals: 6.16.2017". Showbuzz Daily. Retrieved June 19, 2017.
Jump up ^ Mitch Metcalf (June 26, 2017). "Top 150 Friday Cable Originals & Network Finals: 6.23.2017". Showbuzz Daily. Retrieved June 26, 2017.
Jump up ^ "Andi Mack Episodes". Disney ABC Press.
Jump up ^ Mitch Metcalf (October 30, 2017). "Top 150 Friday Cable Originals & Network Finals: 10.27.2017". Showbuzz Daily. Retrieved October 30, 2017.
Jump up ^ Mitch Metcalf (November 6, 2017). "Top 150 Friday Cable Originals & Network Finals: 11.3.2017". Showbuzz Daily. Retrieved November 6, 2017.
Jump up ^ Mitch Metcalf (November 13, 2017). "Top 150 Friday Cable Originals & Network Finals: 11.10.2017". Showbuzz Daily. Retrieved November 13, 2017.
Jump up ^ Mitch Metcalf (November 20, 2017). "Top 150 Friday Cable Originals & Network Finals: 11.17.2017". Showbuzz Daily. Retrieved November 20, 2017.
Jump up ^ Mitch Metcalf (November 28, 2017). "Top 150 Friday Cable Originals & Network Finals: 11.24.2017". Showbuzz Daily. Retrieved November 28, 2017.
Jump up ^ Mitch Metcalf (December 4, 2017). "Top 150 Friday Cable Originals & Network Finals: 12.1.2017". Showbuzz Daily. Retrieved December 4, 2017.
Jump up ^ Mitch Metcalf (January 17, 2018). "Top 150 Monday Cable Originals & Network Finals: 1.15.2018". Showbuzz Daily. Retrieved January 17, 2018.
Jump up ^ Mitch Metcalf (January 22, 2018). "Top 150 Friday Cable Originals & Network Finals: 1.19.2018". Showbuzz Daily. Retrieved January 22, 2018.
Jump up ^ Mitch Metcalf (January 29, 2018). "Top 150 Friday Cable Originals & Network Finals: 1.26.2018". Showbuzz Daily. Retrieved January 29, 2018.
Jump up ^ Mitch Metcalf (February 5, 2018). "Top 150 Friday Cable Originals & Network Finals: 2.2.2018". Showbuzz Daily. Retrieved February 5, 2018.
Jump up ^ Mitch Metcalf (February 12, 2018). "Top 150 Friday Cable Originals & Network Finals: 2.9.2018". Showbuzz Daily. Retrieved February 12, 2018.
Jump up ^ Mitch Metcalf (February 20, 2018). "Top 150 Friday Cable Originals & Network Finals: 2.16.2018". Showbuzz Daily. Retrieved February 20, 2018.
Jump up ^ Mitch Metcalf (February 26, 2018). "Top 150 Friday Cable Originals & Network Finals: 2.23.2018". Showbuzz Daily. Retrieved February 26, 2018.
Retrieved from "https://en.wikipedia.org/w/index.php?title=List_of_Andi_Mack_episodes&oldid=835459544"
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