Articel 210.4

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jusme123 said:
It would than be legal to run a 10/4 to the dryer and grab a 20 amp MWBC off the dryers nuetral and handle tie the two breakers?
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Nope. Besides not being able to do it physically, that would place more than one circuit per phase on one conductor.

Now, if you had a dryer that did not require the neutral, you'd be okay.
 
LarryFine said:
Nope. Besides not being able to do it physically, that would place more than one circuit per phase on one conductor.

Now, if you had a dryer that did not require the neutral, you'd be okay.
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My fault Larry, I am an industrial/commercial electrician that works with three phase.
 
roger said:
Take the dryer for example, it utilizes a two pole MWBC and can use handle ties or a multi-pole breaker, a "two pole" breaker is not mandatory for this circuit, see 240.15(B)(2)

Roger
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Doesn't the language of 210.4(C) prevent you from using handle ties in this situation? It appears to say the OCPD must open BOTH ungrounded conductors.

Nevermind... I guess EX 1 allows it for the dryer...
 
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Mike Stewart said:
Can someone help me understand this article, the way it is being explained is that for every "hot" you have to have a neutral, or you can install a three pole breaker, have three hots and one neutral.
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If you have a 3phase load that requires a neutral then use a 3pole breaker.

If you have 3 circuits supllying 3 seprate loads then use single pole circuit breakers

You do not have to have 3 seprate neutrals unless it is spec by the engineer..
 
Twoskinsoneman said:
Doesn't the language of 210.4(C) prevent you from using handle ties in this situation? It appears to say the OCPD must open BOTH ungrounded conductors.

Nevermind... I guess EX 1 allows it for the dryer...
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210.4(B) 2011 NEC.

(B) Disconnecting Means. Each multiwire branch circuit
shall be provided with a means that will simultaneously
disconnect all ungrounded conductors at the point where
the branch circuit originates.
Informational Note: See 240.15(B) for information on the
use of single-pole circuit breakers as the disconnecting
means.
 
LEO2854 said:
210.4(B) 2011 NEC.

(B) Disconnecting Means. Each multiwire branch circuit
shall be provided with a means that will simultaneously
disconnect all ungrounded conductors at the point where
the branch circuit originates.
Informational Note: See 240.15(B) for information on the
use of single-pole circuit breakers as the disconnecting
means.
Click to expand...

So I guess in 2011 we will no longer be able to use fuses?:confused: never seen a common trip fuse:roll:
 
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