branch circuit

branch circuit

[¦branch ¦sər·kət]
(electricity)
A portion of a wiring system in the interior of a structure that extends from a final overload protective device to a plug receptable or a load such as a lighting fixture, motor, or heater.

Branch circuit

The portion of an electrical wiring system that extends beyond the final, automatic overcurrent protective device (circuit breaker or fuse), which is recognized by the National Electrical Code for use as a branch-circuit overcurrent protector, and that terminates at the utilization device (such as a lighting fixture, motor, or heater). Thermal cutouts, motor overload devices, and fuses in luminaires or plug connections are not approved for branch-circuit protection and do not establish the point of origin of a branch circuit.

Branch circuits serving more than one outlet or load are limited by the National Electrical Code to three types:

  • 1.  Circuits of 15 or 20 A may serve lights and appliances; the rating of one portable appliance may not exceed 80% of the circuit capacity; the total rating of fixed appliances may not exceed 50% of circuit capacity if lights or portable appliances are also supplied.
  • 2.  Circuits of 30 A may serve fixed lighting units with heavy-duty lampholders in other than dwellings or appliances in any occupancy.
  • 3.  Circuits of 40 or 50 A may serve fixed lighting with heavy-duty lampholders in other than dwellings, fixed cooking appliances, or infrared heating units.

branch circuit

The portion of an electric wiring system that extends beyond the final overcurrent device (such as a fuse) protecting the circuit.
References in periodicals archive ?
ABB's electrification scope ranged from substation level to socket, including transformers, medium-voltage switchgear, circuit breakers, SMISSLINE TP, CMS-700 branch circuit monitoring devices, and industrial plugs and sockets.
Monitor electricity usage per branch circuit or appliance,
The transition from open-loop switch to a running state performed immediately (jump) and transition from a running state to off--a smooth increase in resistance and inductance phase branch circuit breaker during certain specified time (corresponding real-time switching) for objectified law as a function of time.
An intelligent panelboard simplifies system design and installation by integrating branch circuit protection and lighting control functions in a single panel enclosure.
RLA is not the same as the Branch Circuit Selection Current described in code Section 440.22(C).
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Low voltage energy specialist, SOCOMEC, has launched the latest addition to the DIRIS A range of multi-function meters--the DIRIS Branch Circuit Monitoring System (BCMS) 720 system.
To the issue at hand, where do we find the correct answer to the question of minimum conductor size on a 20A branch circuit? It lies in a succession of sections in chapters 1 through 4 of the NEC, as follows:
A variable frequency drive, emergency stop button, fused rotary disconnect switch, branch circuit protection, interlocking safety circuitry and fan shrouds are included.
Although the multifrequency strategy in the framework of dispersion engineering of artificial TLs draws some analogies with [20], the fully-printed resonant-type structures and the introduction of more operating bands on the basis of new dual-shunt branch circuit theory distinguish completely from that work by utilizing the nonresonant-type artificial TLs.
If you aren't using liquid-tight flexible metal conduit, you can still color code your branch circuit power whips for primary and secondary power sources using our colored faceplates and boxes.
International Resource News-October 3, 2012--Leviton launches new SmartlockPro(R) Outlet Branch Circuit Arc Fault Circuit Interrupter(C)1994-2012 ENPublishing - http://www.enpublishing.co.uk

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