Reply by wdkits1

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Posted on Fishing Electric Wiring

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215 posts in 3347 days

#1 posted 03-28-2009 09:23 PM

Hi Matt
If the conduit is indeed 1” as you said and is continuous from the house to your shop the NEC allows 6 #6 THHN single copper conductors in a 1” schedule 40 PVC conduit.What you will need is 2 conductors of #6 preferably black and red [hots] ,1 #6 white [neutral] and 1 # 8 green [ground].Because this is a service for a sub-panel the green and white terminate on the same bar at the main service but terminate on separate bars at the sub-panel. By pulling a separate ground and installing a separate ground bar in the new panel a ground rod will not be required. If the conduit is not continuous then this will not work as single conductors have to be enclosed in conduit.To pull the new wires in it would be easiest to tie a pull rope 1/4” to the existing wires and pull them out pulling the rope in then tying the new wires to the rope and pulling them in using a little pulling lube [dish detergent works].
I just took another look at you pics and your conduit may be 3/4” in which case code allows 4#6 THHN copper conductors which means that what I described can still work just don’t let the wires get crossed up when you pull them in. If the conduits at each end just stubb thru the walls then you can extend them into the panels using flexible non metallic conduit.

-- Mike --

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