I need to fish some 240v wiring as follows: From the breaker panel
into an existing 3/4 inch conduit that goes vertical umtil it hits the
ground. Once in the ground it nakes several 90 degree turns until it
comes back out of the ground about 25 feet away. A great portion of
the underground run is in conduit that is under concrete. There are
wires in the conduit now but they are the wrong guage for what I am
trying to do. What is the easiest way to remove the old wiring and
then run new wiring without tearing everything up?
Left out most important part besides what others already said -- what
size/number of existing and proposed wires? What type of conduit?
You'll undoubtedly need to lube the new when pulling it, too. How easy
it will be to pull the old will be very much dependent on what is there
and how the run actually goes and what condition it is in underground.
A lot there will depend on how long it's been in place.
On Tue, 01 Apr 2008 07:44:53 -0700, The Midnight Gardener <The
Midnight Gardener> wrote:
Pulling the wires out one at a time will probably be hard to do.
The most practical way would be to pull out the old wire with a string
attached to the wire. Use the string to pull in a pull rope that
would be reusable.
Pulling out the old wire will give you a chance to measure the length
for the new wire.
Don't forget to use wire soap. It really helps one person is pushing
on the wire while the other is pulling. 1,2,3 pull 1,2,3 pull
There is a limit to how many wires you can put in a 3/4 pipe. I am
guessing that because the existing pipe is in concrete you may find
out what that limit is. :)
I am not sure what the record is. Let us know.
If you have to pull out the old wire, and you do, wouldn't it be a
good idea to solder the new wires to the old wire?
That way you wouldn't have to worry abou tthe pull string breaking, or
coming loose from the wire.
Or you could do both if you wanted. Solder the wires and also pull
the pull string through. I assume the string (nylon?) won't be very
thick and will go through easily. If the wires go through on the
first time, you can leave the string in place in case you need to add
an additional wire later.
He should be able to estimate pretty well, and how hard is it to have
10 or 20 feet extra just in case.
he will have to be certain the old conduit is large enough for the new
larger wiring gauge......
since theres no reason to thiner wiring.....
even worse if he needs to add another conductor, like a real neutral
Thanks for ll of the good advice everyone. This is going to be one of
my honetdews in the coming weeks. The wires are for a spa that someone
gave my wife. I wish the thing would just go away!
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