Sharing a neutral on a 3 phase system

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poushey

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In a previous post, the reply was as long as the ckts are on different phases it is code compliant.
I cannot find any mention in the NEC about sharing one neutral for three individual single- phase circuits on a 3 phase 208/120 system. I did find paragraph 250-122(c) which discusses sharing one neutral for multiple circuits. However, it does not mention single-phase circuits. The example in the NEC handbook only discusses sharing a neutral for 3-phase ciruits. Does anyone know the paragraph in the NEC that permits the use of one neutral to be shared with multiple single-phase circuits?
 
iwire

iwire

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Re: Sharing a neutral on a 3 phase system

The circuit you are talking about is a multiwire branch circuit.

Here it is in article 100

Branch Circuit, Multiwire. A branch circuit that consists of two or more ungrounded conductors that have a voltage between them, and a grounded conductor that has equal voltage between it and each ungrounded conductor of the circuit and that is connected to the neutral or grounded conductor of the system.
Click to expand...
The term shows up about 30 more times in the code but you can start here.

210.4 Multiwire Branch Circuits.
 
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