conduit touching another conduit
#1
02-27-14, 10:48 AM
conduit touching another conduit
Is it code compliant if one piece of emt is touching another piece of emt?
Is that bad practice? Ie grounding etc?
Is that bad practice? Ie grounding etc?
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#2
02-27-14, 11:24 AM
In commercial installation you often have multiple runs of conduit fastened to Unistrut. The Unistrut is metal and the bracket is metal with no insulator so you could say conduit electrically touching conduit is the norm and certainly not a code violation. In fact code says when you have multiple branch circuits in the same junction box all grounds must be connected together.
#4
02-27-14, 12:41 PM
ALL metallic parts in a building that might become energized, even under fault conditions, are supposed to be bonded and ultimately back to the earth. In other words, the conduits are supposed to be "connected" together in an electrical sense. the only thing to be concerned about is if the two conduits are rubbing rather than being stationary. Rubbing can wear a hole in the conduits over a period of time.
#6
02-27-14, 02:20 PM
Another thing...
I have to run emt in my basement from the ceiling which is exposed joists. I was able to get in one circuit with only some conduit touching. However, the other one has to go across copper pipe. Problem is the copper pipe is slightly lower than the joists bottoms where I intended to strap my emt too.... I really don't want to strap the emt tight to the copper plus the dissimilar metal thing cant be good.
Any idea how to tackle something like this? Essentially I have to get emt lower than the water pipes but the water pipes are sticking out lower than the joists in spots.
I have to run emt in my basement from the ceiling which is exposed joists. I was able to get in one circuit with only some conduit touching. However, the other one has to go across copper pipe. Problem is the copper pipe is slightly lower than the joists bottoms where I intended to strap my emt too.... I really don't want to strap the emt tight to the copper plus the dissimilar metal thing cant be good.
Any idea how to tackle something like this? Essentially I have to get emt lower than the water pipes but the water pipes are sticking out lower than the joists in spots.
#8
02-27-14, 06:07 PM
Member
Good call on the copper pipe.
When I worked maintenance, an office area got renos and the plumbers and electricians butt heads over who was going to have to move some runs in one area of the ceiling. Neither side caved and the result was a piece of EMT bucked right against a bare copper pipe. A few months later, a hole had been eaten in the copper pipe and part of the offices flooded.
Never mix dissimilar metals.
pcboss gave the best answer. Check this page out.
Offset Bends
When I worked maintenance, an office area got renos and the plumbers and electricians butt heads over who was going to have to move some runs in one area of the ceiling. Neither side caved and the result was a piece of EMT bucked right against a bare copper pipe. A few months later, a hole had been eaten in the copper pipe and part of the offices flooded.
Never mix dissimilar metals.
pcboss gave the best answer. Check this page out.
Offset Bends
#9
02-28-14, 05:32 AM
Wow, you had to mention it. Upo closer look I found one place where a 3/4 copper is touching a 3/4 rigid conduit.
Obviously I cannot move either. What can I do to separate this metals, theres hardly any play in the pipes.. perhaps enough to wrap tape around the conduit?
Obviously I cannot move either. What can I do to separate this metals, theres hardly any play in the pipes.. perhaps enough to wrap tape around the conduit?
