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Multi-wire Branch Circuit Wiring
C–4 975-0012-01-02 Rev A
Identifying Multi-wire Branch Circuits
Identifying
characteristic
Multi-wire branch circuits can be identified by removing the cover on the load
center and inspecting the wiring. Conventional 120 Vac circuits are identified by a
2-wire-plus-ground (black, white, and copper) “romex” for each circuit.
Multi-wire branch circuits use a 3-wire-plus-ground arrangement (black, red,
white and copper) for each circuit run.
If this arrangement exists in the panel and it is being powered by a stand-alone
120 Vac inverter, a potential fire hazard exists! For safety, these circuits must be
rewired to meet code.
WARNING: Shock Hazard
The next step involves opening the load center, exposing live circuits. This
procedure should only be performed by qualified persons or electricians.
Figure C-4
Multi-wire Branch Circuit Wiring
Ground Bare
Copper
Single Neutral
White
Red From L2
Breaker
Red From L1
Breaker
To Branch Circuits