Pulling cables through a JB

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rdcain

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Littleton, CO
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Electrical Engineer
Is it ok per the NEC to pull some of the cables through a junction box without terminating them? Thanks in advance
 
Do you mean conductors or cables? I guess it doesn't matter however the box needs to be grounded if your raceway isn't metallic and that would change things for the equipment grounding conductor.
 
First I'd have some large 12Pr 'trunk' instrumentation cables that I'm pulling into the junction box and terminating there. From those terminals I'd run smaller cables out to field devices. The cables are entering and leaving the JB through conduit.
Then I'd have a second group of smaller Instrumentation cables (4Pr) that I'd like to only pull through the JB. They'd enter the JB through their own conduit but leave the JB in the same conduits as the smaller cables in the first group. So I'd be using the JB as a pull.box for this second group of cables. Will the NEC allow this?
 
I assume that all the conductors are rated the same voltage

300.3(C) Conductors of Different Systems.
(1) 1000 Volts, Nominal, or Less. Conductors of ac and dc
circuits, rated 1000 volts, nominal, or less, shall be permitted to
occupy the same equipment wiring enclosure, cable, or raceway.
All conductors shall have an insulation rating equal to at
least the maximum circuit voltage applied to any conductor
within the enclosure, cable, or raceway.
Click to expand...
 
Well, unless they are Class 1 (which I doubt) you don't even need a J box. If you do use one you are free to do anything you want. (Except mix them with other cables or conductors of Class 1 or power within it.)

-Hal
 
hbiss said:
Well, unless they are Class 1 (which I doubt) you don't even need a J box. If you do use one you are free to do anything you want. (Except mix them with other cables or conductors of Class 1 or power within it.)

-Hal
Click to expand...
While you may not need a box, what ever you install is covered by the NEC and all of the rules apply.
 
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