Technical information

FEEDER AND BRANCH CIRCUITS
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An example of feeders and branch circuits
Figure: Feeder circuit
Feeder: all the conductors and the circuits up line from the supply side of the
branch circuit overcurrent protective device.
BCPD: Overload protection device (e.g. circuit breaker,fuses).
Branch Circuit: the conductors and the components down line from the last
over current protective device and the load Branch Circuit #1 Branch Circuit #2
In branch # 1 the branch circuit begins at the fuse connection power blocks
(branch circuit protection). In the case of circuit # 2 the transformer and the
relative protection at the primary should be considered part of the feeder,
therefore in cases of transformers and/or autotransformers, the Branch Circuit
always begins at the secondary of the transformer/autotransformer.
1.2 Power circuits and control circuits
The circuits inside electrical equipment are sub-divided between:
•Power circuits
•Command and control circuits (remote control circuits)
Command and control circuits are considered the circuits that power and control
loads such as:
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