A 1" conduit is rated for four #4 THHN wires so 3 and a ground should be no
problem if the conduit is still sound. Use a good pulling lube and a steel
fishtape. It should go easily.
Steve the Electrician
> Hi,
>
> I'm finally about to rewire my shop and need to pull new wire for a
> sub-panel. The problem is my electrician specified #4 thhn wire and I
> only have a 1" conduit. The conduit runs under a concrete slab so I
> don't really want to replace it. Any tips for getting three #4 and one
> #10 wires through the conduit? There are at least two 90 degree turns
> I know of.
>
> Thanks,
>
> John
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