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#99851 - 09/22/06 10:17 AM NEC - Separation between control and power lines
Currently Offline

Registered: 04/21/02
Posts: 54
Loc: 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 ....

2014 / 2011 NEC & Related Books and Study Guides
#99852 - 09/22/06 12:09 PM Re: NEC - Separation between control and power lines
earlydean Offline

Registered: 12/22/03
Posts: 749
Loc: Griswold, CT, USA
so long as the wiring is separated by an enclosed wiring method, (NM cable, conduit, etc.) no.

#99853 - 09/26/06 09:38 AM Re: NEC - Separation between control and power lines
jwhite Offline

Registered: 12/01/05
Posts: 67
Loc: Trenton, NC, USA
1/4 inch for class two and three. Or a suitable barrier.

#99854 - 09/26/06 10:14 AM Re: NEC - Separation between control and power lines
George Little Offline

Registered: 01/18/04
Posts: 1492
Loc: 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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