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 ?
The innovative design also enables users to switch out branch circuit breakers with no rewiring required.
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.
It works with branch circuit monitoring systems to monitor and manage their power system information, whether its a large corporate data center or a colocation facility.
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.
Flexible cord shall be protected, where supplied by a branch circuit, in accordance with one of the methods described in 240.
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.
To make data center management easier, PDU Cables, the first branch circuit power whip manufacturer to offer colored conduit, now offers colored faceplates and boxes painted to match its eleven colors of liquid tight flexible metal conduit.
International Resource News-October 3, 2012--Leviton launches new SmartlockPro(R) Outlet Branch Circuit Arc Fault Circuit Interrupter(C)1994-2012 ENPublishing - http://www.
branch circuit monitoring to provide capacity utilization if no metered PDUs
The full voltage rating up to 600 V ac (80 V dc) allows installation flexibility in many applications where feeder and branch circuit protection are required.