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Open Neutral Multi-wire Circuit

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Multi-wire Branch Circuit with Open Neutral

Multi-wire Branch Circuit with Open Neutral

The wire connector that connects the neutral wires together is removed to check for loose wiring.

In the diagram above, the A phase circuit breaker is turned off on a multi-wire branch circuit. The wire connector is removed from the neutral wires for inspection in an A phase receptacle electrical box. In the A phase receptacle box:

Multi-wire Branch Circuit Open Neutral Diagram 2

In the diagram above, the A  and B phase circuit breakers are turned on on a multi-wire branch circuit. If the neutral wire is removed from the A phase receptacle, there will be 0 V on this neutral wire. There is an unbroken current path from the B phase receptacle to the neutral bar in the main electrical panel.