Multi wire branch circuits

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sharan

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I have a gym space. I want to connect lighting at 277volts, single phase - 3 circuits with one neutral ( i.e. 3 hot and a neutral) in 3/4" conduit. Is this considered a MWBC - multi wire branch circuit? Will NEC 2008 - 210.4(B) apply here? Thanks.
 
Yes, what you have described is a multiwire branch circuit and 210.4(B) would apply.

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.
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Chris
 
Sharan,

As Chris has noted, what you describe is a multiwire branch circuit. Meaning ALL of Section 210.4 would be applicable to your installation.


While you did not ask, you did say:
sharan said:
I have a gym space. I want to connect lighting at 277volts, single phase - 3 circuits with one neutral ( i.e. 3 hot and a neutral) in 3/4" conduit. Is this considered a MWBC - multi wire branch circuit? Will NEC 2008 - 210.4(B) apply here? Thanks.
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...and while I hate to continue to stir this particular pot...

I thought it important to note that since you are utilizing 277-volts, this makes your lighting choices limited to pretty much ballasted lighting. This means that (at a minimum) parts of your installation are most likely subject to the requirements of Section 310.15(B)(4)(c)...

I do hope this is helpful...

mweaver
 
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Grouped

Grouped

I believe it is to be "grouped" by wire tie or other similar means. Circuit marking the neutral while not required is an excellent idea
 
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