Splices on branch circuits

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tjmicsak

tjmicsak

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Location
NY
When relocating house panels I have always run new romex leads and JBs out to each of the circuits in accessable places and spliced them to the new panel feeds. I know you cannot put different class wiring in the same box, but if possible could I use one large splice box and do it all in one box? This would be using the same box to make several branch circuit splices and also have 120V and 240V splices in the same box. I would size the box per wire fill. I don't know if this is code, but then again I see it in wireways and gutters all the time. Am I over using the code stipulation of not having 2 seperate systems in one box?
 
What code section says that two systems cannot be in the same box?
200.6(D) tells you how to identify the grounded conductors of different systems in the same raceway, box, etc.
300.3(C) tells you that "...ac circuits, and dc circuits shall be permitted to occupy the same equipment wiring enclosure, cable, or raceway."
I think you are trying to meet a requirement that does not exist.
 
Re: Splices on branch circuits

tjmicsak said:
When relocating house panels I have always run new romex leads and JBs out to each of the circuits in accessable places and spliced them to the new panel feeds. I know you cannot put different class wiring in the same box, but if possible could I use one large splice box and do it all in one box? This would be using the same box to make several branch circuit splices and also have 120V and 240V splices in the same box. I would size the box per wire fill. I don't know if this is code, but then again I see it in wireways and gutters all the time. Am I over using the code stipulation of not having 2 seperate systems in one box?
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Just out of curiousity, are you a licensed electrician?
 
Splices

Splices

Yes I am licensed, and it was actully an instructor who told of an example of a switch box that had another voltage circuit passing through it and he said it was not code. Also there was an example in a magazine a while back where someone had taken a horizontal 4x4 gutter, bore verticaly straight through it and ran a 3/4" conduit through it for another circuit. If memory serves me it was cited as not code because two seperate systems could not share the same box. I can see alot of other reasons not to do this, but that, I believe was the reason. Also fire systems I believe cannot be in the same box with other circuits. So based on the information I have seen, I posed the question as to what is and isn't Ok here.
 
If the two switches have a potential of more than 300 volts between them, then your instructor was correct. See 404.8(B). Switches are not wiring. Do not try to oversimplify the code. Some signalling circuits cannot be installed with circuit conductors, but you can't make a blanket statement that different systems cannot be installed in the same raceway or box.
 
If you had a normal system and an emergency system than the two systems can not share the same raceway, cable or box, etc.
 
when you say house panels, are you taoking about residential?
if you are, then even though you have 120v and 240v in the same jbox, they are not seperate systems. they both come from the same panel and eventually, the same source (the service)
 
Why can't you run a conduit through a wireway? I've seen it done many times to keep intrinsically safe circuits away from power/control wires. Conduit enters the bottom and exists the top w/no fittings.
 
hardworkingstiff said:
Why can't you run a conduit through a wireway? I've seen it done many times to keep intrinsically safe circuits away from power/control wires. Conduit enters the bottom and exists the top w/no fittings.
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Been in that jam before,space not being the issue i see no violation.120 /240 same junction ? Why not they came from same panel.
 
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