Single Phasing

[laketime]

Can someone please explain how you get 220v from "singe phasing" a house. Ran into it the other day, 220v hot to neutral in a receptacle. Opened the box and found the h.r. neutral had come out of the wire nut.

 

[Ken9876]

With a MWBC if the neutral comes undone the circuit becomes a series circuit with the loads plugged into the recs completing the circuit. Then the voltage between the two hots 240 is dropped across the different loads, depending on the resistance of that load.

 

[480sparky]

"Single Phasing" is a term generally used to describe the loss of one phase in a 3-ph system.

Sure you're not thinking of an Open Neutral?

 

[mivey]

It is called an open neutral as the others posted (nice example 480).

In comparing with the 3-phase version of "single-phasing", you would have "lost one leg" and have 120 volts to neutral on one leg and 0 or ?? volts to neutral on the other. To describe it as "single-phasing" in this case, you would have to subscribe to the notion that 120/240 is a two-phase service. While technically correct, it is not industry-standard nomenclature for this type service.