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#99851 - 09/22/06 01:17 PM NEC - Separation between control and power lines  
Currently  Offline
Member
Joined: Apr 2002
Posts: 53
TN
My book is at home now and I have this question for the industrial control people here.

Is there anything in the NEC that dictates a defined separation between control wiring and power wiring?

I.E. 14 inches per kilovolt ....


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#99852 - 09/22/06 03:09 PM Re: NEC - Separation between control and power lines  
earlydean  Offline
Member
Joined: Dec 2003
Posts: 751
Griswold, CT, USA
so long as the wiring is separated by an enclosed wiring method, (NM cable, conduit, etc.) no.


Earl

#99853 - 09/26/06 12:38 PM Re: NEC - Separation between control and power lines  
jwhite  Offline
Member
Joined: Dec 2005
Posts: 64
Trenton, NC, USA
1/4 inch for class two and three. Or a suitable barrier.


#99854 - 09/26/06 01:14 PM Re: NEC - Separation between control and power lines  
George Little  Offline
Member
Joined: Jan 2004
Posts: 1,489
Michigan USA
Need to know what the control wiring is controling. If it is Class 1 wiring and it is functionally associated with the power wiring there is no problem having it in the same raceway as long as the insulation on all the conductors has a high enough rating. If the control wiring is Class 2 then it can not be in the same raceway with the power wiring without a barrier. 725.26(B)(1), 725.55(A)


George Little


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