Originally Posted by ALEXT
i believe they call this a multiwire branch ciruit. 210.4 the biggest problem i see with that setup is that it's awfully risky. if that super nuetral ever got cut or unhooked there could end up being 240v on all 4 circuits. a lot of equipment would get fried.


Alex, in reality there could not be 240 volts on any one of the circuits if the neutral were lost, the voltage on each load would be the determined by it's resistance and if they were all equal nothing would happen and the circuits would keep working like nothing was missing.

Below is an illustration of a multiwire circuit with a broke neutral, using the formula I x R = E calculate what the voltage dropped across each load would be, you will see that neither load will see 240 volts.

[Linked Image]

Roger