scott moore wrote:

By plumbing U joint you mean union. The electrical equivalent is an
Erickson coupling IIRC - also 3 piece but somewhat different
construction. It should be pretty easy to get but not likely from the
Borgs; Grainger?. Repost if it is not easy to google. Another
possibility is a rigid threadless compression fitting. Like an EMT
raintight coupling on steroids. You should cut off the threads to use
it (it us used on a cut end). PVC, as gfretwell, may be easier;
presume there is a ground wire.

bud--


U as in union, sorry. I am trying to get a 20 foot run to turn up 90
so that it will surface. You can't just twist on a 90 elbow with the
wire inside it, so I need to pull the old wire through, attach to
the old tubing, which I have already cut and re threaded. I carefully
scored around the outside of the tubing, then cracked the joint without
damage to the wire, then dressed the ends with a file, then rethreaded
with a manual ratchet threader.


Sounds like good prep but what a PITA.

I was able to find at least one reference to a union for rigid conduit,
thank you.

I think one poster here thought I was going to pull all new wire
through. Interesting, but the present wire is fine. Its actually
all ok underground, just the outside box was rusted out.

The PVC transition would be nice. The gentleman at the hardware
store told me that was against code. Still, it does not really solve
the problem at hand unless you are talking about that moisture tight
flex conduit. Are you talking about going to glued couplings? If so,
that would be great (since no twisting is involved). There is indeed
a ground wire. As long as nobody (no city inspector) is going to get
bent out of shape about transitioning from metal to PVC underground,
that sounds good.


PVC would be a female adapter on the threaded end then the usual rigid
PVC, factory 90 at the upturn, male adapter at the end, all glued
connections. All as moisture tight as the original rigid. The PVC idea
came from gfretwell who is an inspector (maybe retired) - much better
than the hardware guy. If it is going to be inspected ask your
inspector. Should be no problem with a ground wire.

Thanks for the good thoughts. I must admit I was fairly depressed today
about this, I have done a lot of work on the pump, filter, heater and
the enclosure. I thought the wiring part was not a big deal. I have done
lots of indoor wiring with romex, and thin wall indoor conduit, which
does not have these kinds of issues.


The really hard part was getting a threaded end on the pipe without
mangling the wires. Whats left should be easy.

bud--