This article was posted 10/20/2006 and is most likely outdated.

Article 210 Branch Circuits 210.4
 

 
Subject - Article 210 Branch Circuits 210.4

October 20, 2006  

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Branch Circuits

210.4 Multiwire Branch Circuits

Part I. General Provisions

New FPN alerts the Code user to ensure that the continuity of the grounded neutral conductor of a multiwire circuit isnít interrupted (open), because doing so can result in a fire and/or destruction of electrical equipment because of under- or over-voltage.
(C) Line-to-Neutral Loads. Multiwire branch circuits must supply only line-to-neutral loads.
Ex 1: A multiwire branch circuit is permitted to supply line-to-line utilization equipment, such as a range or dryer.

Ex 2: A multiwire branch circuit is permitted to supply both line-to-line and line-to-neutral loads if the circuit protection device opens all ungrounded conductors of the multiwire branch circuit simultaneously under a fault condition (multipole circuit breaker with common internal trip). Figure 210-1

FPN: See 300.13(B) for the requirements relating to the continuity of grounded neutral conductor on multiwire circuits.

CAUTION: If the continuity of the grounded neutral conductor of a multiwire circuit is interrupted (open), the resultant over- or undervoltage could cause a fire and/or destruction to electrical equipment. Figure 210-2



Figure 210-1
(Click on image to enlarge)


Figure 210-2
(Click on image to enlarge)

     

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Comments
  • Resistive and capacitive loads are in relation to whether the current or voltage is leading or lagging in the phase angle. Tnis can affect the power factor and play a part in harmonic distortion. The nuetral does not care what type of load you have when it is being shared as long as the ungrounded conductors are on opposing phases.

    Benjamin Brown

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