I need to temporarily run a length of romex 6/2 with ground ( rated for
inside use) across my flat roof.. I expect it'll be up there maybe two or
three weeks. Is it o.k. as is...or should I run it in electrical pvc
conduit to keep the sun off it while it is in temporary use ? (live in
Phoenix...still about 98-103 during the days)
I'm just curious, and not meaning to start a flame war here, but where in
the code does it prohibit romex to be in conduit. I remember threads in
the past where this was discussed and I can't remember what the outcome was.
a) Don't matter what the NEC says if your local inspector shoots it
b) As I understand it you can run Romex in conduit. I have run 100's
of Romex wires inside conduit for additional physical protection. You
just can't run it inside a "conduit system" which means conduit
attached to a box at both ends or for extended lengths. You also must
provide a large enough conduit to prevent overheating. I try to use
3/4" for a single 12-2 or 12-3 NM cable to be on the safe side.
c) Today I ran 2 12-2 NM's inside a single 1/2" piece of EMT for 8 feet
with the yellow jacket stripped except for a few inches at the end for
a clamp. It's safe but you might have someone complain because the
wires inside NM don't have THHN written on them even though they are
rated at 90-105C.
Hope this helps,
Thanks William. Your letter (a) is right on! I tell ya, trying to figure
out all the code requirements is harder than the actual wiring of just about
anything! I just ran some circuits in my garage and I spent more time
thumbing through the code book looking for stuff than I did doing the actual
work. Probably why Electrician's charge so much!
The problem with sleeving NM cable through metal conduit is that it's not
bonded to the conduit and if it gets cut on the edge, the conduit could
become live. One issue with running NM in a conduit system which would make
it illegal is possibly the location of the conduit system. NM cable, like
THHN wire are not for wet locations. Therefore running those inside a
conduit system that is in a wet location, like underground would be illegal.
There is however no reason not to sleeve NM through PVC in a dry location
for added protection
You keep saying that -- and I, and several others, keep asking you to cite the
article of the Code that backs you up. You haven't -- because you can't. Fact
is, the NEC _explicitly_permits_ the use of conduit to protect NM cable from
Doug Miller (alphageek at milmac dot com)
It depends on whether you tell anyone or not. Seriously. (I would
probably run aluminum triplex cable cuz it's cheap and it's designed for
outdoor use -- but it's not really rated for this application either.)
Attach it with a plug instead of hardwiring it and it won't matter so
much whether it meets code or not.
Bob <-- not an electrician
Assuming the wire is the correct size for the load to be carried 30 days of
fun and sun should be no problem. Does it meet any national or local codes?
I doubt that it does. Exceptions to code are normally limited to 3 or 5
days when submitted by a licensed person.
Just because your usage is temporary does not mean it is exempt from a safe
and proper installation. The air temperature may be 98 -103, but the actual
roof temperature could be a few hundred degrees. Running romex across a
roof is definitely not a safe way to go. Without additional information as
to what you are trying to accomplish, I cannot provide you with a solution
that is viable.
Well, it not "OKAY"
But I won't tell anyone.
Just wondering why you need such a heavy cable for only a "temporary" feed.
Obviously this is for more than just using a skill saw, while you build a
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