where in the nec 2008 states that 3 phase branch circuits sharing same neutral have t

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cowboyjwc

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Location
Simi Valley, CA
What Rob said, and I always suggest that you look at 210.4(D) also, depending on your wiring method. Oh and it's not just 3 phase, it's any MWBC.
 

LEO2854

Esteemed Member
Location
Ma
where in the nec does it state that 1-pole circuits in a 3phases system 120/208 volt sharing the same neutral need to be tied together other than terminatating at the same yoke or equiptment?


210.4 (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.
(C) Line-to-Neutral Loads. Multiwire branch circuits
shall supply only line-to-neutral loads.
Exception No. 1: A multiwire branch circuit that supplies
only one utilization equipment.
Exception No. 2: Where all ungrounded conductors of the
multiwire branch circuit are opened simultaneously by the
branch-circuit overcurrent device.
Informational Note: See 300.13(B) for continuity of
grounded conductor on multiwire circuits.
 

LEO2854

Esteemed Member
Location
Ma
where in the 2008 nec states that 3 phase multi-wire branch circuits sharing same neutral have to be tie barred together?


210.4(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.
(C) Line-to-Neutral Loads. Multiwire branch circuits
shall supply only line-to-neutral loads.
Exception No. 1: A multiwire branch circuit that supplies
only one utilization equipment.
Exception No. 2: Where all ungrounded conductors of the
multiwire branch circuit are opened simultaneously by the
branch-circuit overcurrent device.
Informational Note: See 300.13(B) for continuity of
grounded conductor on multiwire circuits.

Welcome to the forum.....:thumbsup:
 
im seeing whats up here now the 2005 nec 210.4b has wording of same yoke or device of multiwire branch circuits being tie barred together which is electrical 101 but 2008 nec has left out same yoke,device or equiptment and thus being interpeted as all multi wire branch circuits sharing same neutral to be tie barred together
 

infinity

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Staff member
Location
New Jersey
Occupation
Journeyman Electrician
im seeing whats up here now the 2005 nec 210.4b has wording of same yoke or device of multiwire branch circuits being tie barred together which is electrical 101 but 2008 nec has left out same yoke,device or equiptment and thus being interpeted as all multi wire branch circuits sharing same neutral to be tie barred together

That's what it says in 210.4(B).
 

Dennis Alwon

Moderator
Staff member
Location
Chapel Hill, NC
Occupation
Retired Electrical Contractor
If you have a pc go to start-all programs-accessories-system tools-character map. From there it will show the keystroke for all the characters on the bottom right.
Hold down the alt key and press the given numbers- square root is alt+251. Use the number pad as it doesn't work with the numbers on top

√4 = 2
 
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