I will be running 200 amps from a service main with pass through in the barn to the house. Can I put anything else in this conduit, or does that violate the code? I would like to run 3-way switched power between the house and barn for lighting and a swithced receptical dedicated to the engine block heater on the tractor.
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If I recall correctly you are not to place unfused lines with fused lines in the same conduit.
I think that the NEC would allow this, but I, personally, wouldn't bother.
Why not? Because the wires go to different places. They come from different places. It's really no big deal, with the ditch already dug, to lay another pipe in it.
Or, are we being a little misleading? Are we thinking of adding wires to an existing pipe. If that is the case, the answer is probably "DON'T do it."
I say this because the existing pipe is likely no larger than it has to be. Adding wires will exceed the allowed wire fill. Or, that you greatly increase your chances of damaging the existing wires when you pull in the new wires. Pipe in the ground always gets wet, and this can result in swollen insulation ... making an even tighter fit.
Simple truth. $100 for an additional pipe and a lot more versatilty makes sense. Thanks.