House Branch Circuit Diagram. This wiring diagram illustrates installing a 15 amp circuit breaker for a 120 volt branch circuit. Branch circuit amperage.
The black wire is usually the a phase 120v. A multi wire branch circuit in a residential dwelling contains two 120v wires of different phases a and b phase and share one neutral wire as return current. Each circuit can be traced from its beginning in the service panel or subpanel through various receptacles fixtures and or appliances and back.
A 15 amp circuit is usually used for wall receptacle outlets and room light fixtures.
The red wire is usually the b phase 120v. Branch circuits for 120 volt circuits are usually 15 amp or 20 amp circuits although occasionally they will be larger than that. A 15 amp circuit is usually used for wall receptacle outlets and room light fixtures. The 14 2 awg cable for this circuit includes 2 conductors and 1 ground wire.
