Is it allowed to run both 110v wire (either THHN or Romex) and low
voltage alarm wire (e.g., 4 conductor 22 gauge) in the same 1/2" rigid
I probably will have one 2-conductor #14 Romex wire for overhead
garage light plus a couple of alarm cables for the window, door, and
No. I think the code is you must run the same guage wire for the
highest voltage running through the conduit. So if your running 14
guage Romex for your HV, you must also run at least 14 guage for the
LV. Thats what I did for my garage. I ran 14 guage for the electrical,
then I ran 2-14 guage for my alarm circuits.
The LV wire does not need to be in conduit. Unless you have a
specific reason to run it thru conduit, just staple it to the floor
joists and/or wall studs. I have also seen places where it follows
along the outside of the conduit and is taped to the pipe with
electrical tape about every 12 to 16 inches. This is particularly
common for thermostat wiring.
I'm not an electrician but some thoughts... unless there is a risk of
the conductors becoming overheated for some reason I don't see why not.
I think when you have two or runs of NM in any kind of conduit what
you want to avoid is the cables pulling the same voltage, or you might
have inductive heating problems? I think the NEC goes into detail
about not pulling two cables through conduit that will be on the same
circuit??? If I am correct I think you would be OK with what you
On 6-Jul-2005, firstname.lastname@example.org wrote:
I'm not trying to be a usenet cop or anything but speculating about
electrical issues does no one any good.
If you know the answer, great, post away. If you don't know the answer,
then just let someone who does post it.
Agreed. The NEC dictates a lot of things that wouldn't be obvious to the
average person via speculation.
And this goes to pretty much everyone in the thread, not just this reply.
If you can't cite the proper code, you probably shouldn't respond.
So you're saying that it's not OK for me to speculate from the
viewpoint of risk avoidance in inductive heating in electrical circuits
(which I made pretty clear I was doing, because I'm not an
electrician), bit it **IS OK** that he should be doing his own
electrical work when the OP seemingly doesn't know where to find or how
to open an NEC manual or other suitable reference to determine
requirements for running conductors in conduit??? Who gives a rat's
ass about citing the correct code chapter and verse if you don't know
what the hell you are doing to begin with???
I'm going to bake a cake and I don't know how to turn the oven on. The
mixing spoon is too cracked and I'm short three eggs. If the OP
insists on doing the work himself and comes to usenet for help, well...
that's his problem.
For the OP, www.nfpa.org sells residential wiring textbooks and
inspector checklists for the uninitiated for about $60 each. They are
based on the NEC. Easy to follow and read. They expire every three
years. 2005 is a good time to buy since the NEC was recently revised.
There is a difference between not knowing basic electrical code and
wiring vs. not knowing a specific and rarely used detail such as in my
question. I asked the question here to expand my knowledge and at
least get some directional pointers to the right answer -- who knows,
maybe my question has a simple and unanimously agreed upon answer or
maybe it doesn't in which case I will need to look elsewhere...
Just as an anecdote, I recently hired licensed master electricians to
rewire major portions of our house and I can assure you that they did
not know details of the code outside of their daily work habits -- I
am also pretty sure that they are not the book types that would be
adept at skimming and interpreting the arcane details of code that
they were not trained in. That does not mean that they are not capable
of doing the wiring if informed of what is allowed.
I agree with you blueman, I was actually trying to help with my limited
knowledge of using conduit and what I've read in the NEC about
inductive heating, might be something you can look into and expand your
knowledge of electrical. I hope you didn't mistake me for a real
electrician and inadvertently burn your house down while reading my
original response to your post. ;)
I wasn't seriously suggesting that you couldn't open a book. But I do
think it is rediculous for individuals on usenet to tell others to keep
their thoughts to themselves in a prevelently DIY forum. The free flow
and exchange of ideas must not be impeded.
And I say that because I am now more knowledgeable of cabling
requirements in conduit. I only had a part of the story with voltage
issues and inductive heating. Perhaps you were not aware of inductive
heating issues and therefore a mutual exhange may have occured.
Good luck with your project blueman
Correct. He has asked for help here in this newsgroup. The fact that he's
asking and not just cramming as many as he can in the conduit shows that he
wants to do it right. Not everyone can/wants to understand the code books.
On the other hand, if you're going to reply to his response, you should know
what you're talking about.
Replies like "this should work" or "I don't think that would be a problem"
are of little help when the code says Yes or No directly.
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