Disconnection of grounded conductor

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ner

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I have been told that a two pole switch can serve as the disconnect for a MWBC to a shed. What about article 225.38 (C) 2005 NEC that says the neutral needs to be disconnected too. Do you install a terminal with pressure connectors in the box with the two pole switch or add another single pole switch or a three pole disconnect to satisfy this requirement? There is one 20 amp 120/208 volt MWBC in this situation.
 
225.38 (exception)
If this is residential you can stop at the exception right after 225.38 and you dont need to have a disconnect on the neutral.
 
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ner said:
It is not residental.
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I would use a small A/C disconnect, and add a neutral buss inside it, cheap and easy. That way you have your neutral point terminals.
 
acrwc10 said:
I would use a small A/C disconnect, and add a neutral buss inside it, cheap and easy. That way you have your neutral point terminals.
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Do they make neutral bars for those cheap disco's and are they service rated?
 
acrwc10 said:
I would use a small A/C disconnect, and add a neutral buss inside it, cheap and easy. That way you have your neutral point terminals.
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And that would not be compliant unless that disco was suitable for service equipment. Most a/c disco are not.
 
Dennis Alwon said:
And that would not be compliant unless that disco was suitable for service equipment. Most a/c disco are not.
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Good point, I don't think most are service rated but there are some cheap discos that are dervice rated. (Does it need to be service rated, since it is disconnecting a branch circuit?)
 
acrwc10 said:
Good point, I don't think most are service rated but there are some cheap discos that are dervice rated. (Does it need to be service rated, since it is disconnecting a branch circuit?)
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Yes. I think Raider wrote a proposal to get that changed.
 
Ok if I run a feed out to a subpanel into a garage i need to provide a disconnect for the two ungrounded conductors AND the neutral conductor? Would a 3 phase service rated disco suffice?
 
Dexie123 said:
Ok if I run a feed out to a subpanel into a garage i need to provide a disconnect for the two ungrounded conductors AND the neutral conductor? Would a 3 phase service rated disco suffice?
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Look at 225.38(C) ......"a terminal or bus to which all grounded conductors can be attached"........
a Neutral bus, just like any other panel, with lugs/terminals are fine. You really don't want a switch on the neutral if you can avoid it.
 
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