I was going to install 1 1/2 inch PVC pipe in the wall from the
basement up to the second floor to make it easier to run more cable
(data cable, TV Coax and such) up there should I need to in the
future. I thought about just running the electric wire in the pipe too
but I though I read where someone on this group mentioned to not run
electric wire through PVC.
Did I misread something or is that true? It if is true, what is the
problem with it.
Sure seems like it would be easier to run wire in future projects. But
then if I do the job right, the won't be much reason to run more wire
for a long, long time anyway.
I just googled on the issue I posted here and it looks like there is a
heat issue if electric wires are enclosed in a conduit.
I really can't see me ever having to run more electric wire up there
as long as I live here. But I will surely run a conduit for the other
types of wire.
You can find any answer you want on a google search, most wrong.
The reality is the (heat) derating for wire in conduit is exactly the
same as it is for wire in a cable.
Also as long as the wire is in a cable, they can all live together in
the same pipe as long as that is just a duct and you are not
terminating either in the same enclosure at either end. Cable jackets
are "separation" .
Any "interference" from 60hz in negligible if you are using twisted
pairs or coax for the signal wires.
If somebody wants an elegant solution, I have 600 feet of maxcell
innerduct that will give you 3 separate cells in the pipe but you
should be running 2" pipe or larger to use it.
(All you want for the shipping)
I don't know about 1.5", but the last time I bought 1/2" and 3/4" grey
conduit at HD, it was cosiderably cheaper than the same size sched. 40
water pipe. One would think it would be the other way around. YMMV.
The problem is that the hot and ground wires will short together
inside the pvc. You will need to install a separate pipe for each
wire, unless you wrap each wire with electrical tape so they can not
short together. If you use steel wire, be sure it's galvanized or it
will rust, or get some stainless steel piano wire, which will last
longer. One other thing. Do not run water thru the pipe, or not
sewer water either. Even if you tape the wires well, the water or
sewerage will cause wires to short out.
OK, here's the scoop:
If your electrical wiring is of cable type (NM, UF, MC, or AC), then
you can run it through any kind of pipe or tube as just a sleeve. The
sleeve is not part of the electrical system, it is there just to make
If you want to run individual electrical wires (like THHN-2), then for
PVC you must use the grey electrical conduit. You also need a
complete conduit system, i.e. the conduit must start and end at
electrical boxes (where you could switch over to other wiring
In terms of overheating, you need to watch how many current carrying
conductors (CCCs) you run together for a significant length. If you
have too many together you have to "derate" each conductor so that it
carries less current, or alternatively upsize the conductor for a
given current. The rules are complicated, and derating potentially
starts at 4 CCCs. However, for NM cable in #14 and #12 sizes, you can
run up to 9 CCCs and still maintain the usual 15A and 20A capacities,
As far as mixing electrical and data wiring, it is best not to for
reasons such as interference, although it may be allowed. You'd have
to check the NEC for the details. I do know that when it is allowed,
and you are using individual electrical wires, then the data wiring
must have an insulation rating at least as high as the voltage of the
Don't just run the pipe. Inside it run some nylon string or something
strong, substantially longer than the pipe, so you can pull new wires
through easily. And leave it there even when you think you are done.
I would like to run one more wire to my attic, but it's too hard to
get it through hole in the plywood between floors one and two.
Actually, get some of that nylon pull
rope that they sell at Lowe's or HD or
at electrical places. And, when pulling
a new wire into the conduit, pull an
extra piece of the nylon stuff for the
they probably won't have it at HD, you will likely have to go to a
real electrical supply house
Thanks for the info.
Wow 59.90 for 6500 feet of the stuff.
Fishing line is a lot cheaper if you get lite stuff.
I could see where a pro could use it.
Realize that that line isn't really rated for pulling wire, it's
intended to be cheap and light weight to install in conduit and then use
to pull actual rope into the conduit to pull the wires. That "Powr-Fish"
relates to it's intended installation method where it is blown through
the conduit by air pressure attached to a little foam plug piston.
The pull line has far more stretch and much lower breaking strength than
rope. It will work ok for pulling light stuff like coax and cat5 cable.
There is a version of it that is a flat woven tape which is marked off
in feet along it's length so you can blow it through an unknown length
of conduit and get a measurement to order wire.
There are small rolls at the big box stores in the electrical wiring
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