I'm having to "second guess" the term, but, if we are using a neutral designated for a different circuit then you stand the possibility of overloading the neutral and setting up a "backfeed" on the neutral from your circuit. 210.4 was added in '08 to prevent such conditions.
Can someone please explain to me what a borrowed neutral is I cant seem to figure out what we are talking about here.
I believe it is using a neutral from a different circuit. This is not only illegal, unless it is part of a mwbc, but cause unwanted emf's.
It would be like taking a neutral from a circuit that has nothing to do with the circuit you are using. Think of 2- two wire circuits and let's say there is a switch on one circuit that doesn't have a neutral in it- just a hot and return. Now you want to add a receptacle in that switch but the closest ad easiest place is to steal a neutral from that other circuit.I'm getting confused with the terminology here.
What is the difference between a borrowed neutral and one that is part of a mwbc? It is my understanding that a mwbc has multiple "hot" circuits sharing one common neutral. Is this correct?
It would be like taking a neutral from a circuit that has nothing to do with the circuit you are using. Think of 2- two wire circuits and let's say there is a switch on one circuit that doesn't have a neutral in it- just a hot and return. Now you want to add a receptacle in that switch but the closest ad easiest place is to steal a neutral from that other circuit.
Two issues:I thought this is esentially what a mwbc was. Two circuits that share a common neutral. I guess I am wrong about this. Can you explain a mwbc then?
I thought this is esentially what a mwbc was. Two circuits that share a common neutral. I guess I am wrong about this. Can you explain a mwbc then?
Even though a MWBC "shares" a neutral with it's ungrounded conductors and can be considered multiple circuits it is only "one" circuit in reality, so the neutral is not borrowed, it is part of the "one" circuit.
Roger
Say you run a 12/3 to a kitchen counter top to supply the required two SA circuits, the neutral would be a part of the circuit and not borrowed.Can you please give an example of a mwbc?
Say you run a 12/3 to a kitchen counter top to supply the required two SA circuits, the neutral would be a part of the circuit and not borrowed.
It would serve the purpose as shown below.
Roger
In the picture example that you showed if this were a (3) phase system and these two phases were connected to the neutral as shown would this be considered a mwbc or borrowed neutral?