John,
I don't think you will be able to get 3 #4's and a #10 into a 1"
conduit, even if it were a straight piece of conduit. You may have to
consider thinner insulation on the wire. I don't have a code manual
handy, but I recall that there are some. As to whether code will allow
those wires in a 1" conduit, I don't know.
You may have to replace the conduit, which isn't as hard as it might
seem. You can water drill a new conduit under the driveway, but you will
need a rather long hole at one end so you can get a new piece of conduit
horizontal.
If you can pull out the old conduit you can connect the new conduit to
it and pull it into place. Drill holes in the old conduit near where the
two conduits join so water can jet out and enlarge the hole in the dirt
to allow room for the larger conduit. You may have to cut the 1" conduit
in short lengths to get it out of the hole, but it is expendable.
Use pull boxes at the ends of the horizontal run if possible to make
pulling wire easier.
Good luck.
Peace,
Pat
john matthews wrote:
>
> 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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