(a slight followup first for those of you who were reading my subpanel
thread a few days ago)
I decided not to use the 100amp box. I found a proper 12 postion
subpanel at the borg. I've already started the install. I'm using
3/4" emt with #6 wire, 60 amp breaker in the main box, a 75' run, all
Originally, I was going to run four wires through the 3/4" pipe (red,
white, black, and green). The electrical guy at home depot said that
if you're using emt, you don't need the separate ground wire since the
boxes are grounded together through the emt. Does this sound right?
So far, I've run the other three. It's a bit of a long run so I'd
rather not do the fourth wire.
If you're using THHN or THWN conductors, that's ok. If TW, THW, RHW, or RHH,
you have a code violation already. They're probably THHN, but you oughta check
just to make sure. It's stamped on the insulation.
The NEC _explicitly_permits_ the use of EMT as an equipment grounding
conductor. [Article 250-91(b)]
Doug Miller (alphageek at milmac dot com)
There is one other thing to consider and that is three 6s in 3/4"
conduit, even thought permitted, can be a tough pull (especially over
75'. Can it hurt you to put in 1" instead? You'll probably have to use
It was tough. I finished it last night. I used 90 degree fittings
also which made it that much worse. Half way through the project, I
started threading sections of emt as I assembled them. That made the
job a lot easier. I didn't look at the price for 1" conduit. I know
the 1 1/4" conduit I would have used for the #3 100amp wire was $15 for
an 8' segment. That was three times more than the $5 for the 3/4". So
I went with the 60 amp parts. If I had to do it again, I would buy the
pipe bender. That tool would probably have been cheaper than the cost
of all the fittings and it would have made pulling the wire easier.
On Tue, 07 Jun 2005 18:15:58 GMT, Doug Miller wrote:
I *think* he meant as in "threading a needle". Rather than pull the wires
through a fully assembled conduit run, he's pushing the conduit sections onto
the cable, one at a time.
At least, that's what I think he meant.
Since you were buying pre bent 90s anyway you could have bought
conduit bodies and had an installed pull point at all the ugly bends.
Bigger pipe is always easier to pull. It just comes down to labor/pain
And what world is that? See the NEC. EMT is explicitly
allowed as the grounding conductor. BX and armoured cable
are explicitly disallowed (as of 1999?).
If I were doing it, using the EMT as the grounding
means, I'd use compression fittings rather than setscrew.
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