I usually call the stuff armored conduit, but I'm referring to the
galvanized tubes that wiring runs through. Is there a code reason why you
shouldn't use it to channel wiring through the walls?
I was thinking of it in terms of making it easier to pull the cable should
the need to pull come up in the future, as well as a way to protect the
wires from insects and rodents chewing on the cables.
I cannot think of a code reason per se unless the wire will generate too
much heat inside the piping (called EMT) but it
will add considerable cost to the install. Why not just pull oversize
wires for those you think you'll need to upgrade later
right up front. I might add as well, that I'm no code expert so take my
words with a grain of salt.
Not at all -- in fact, in some places (Chicago springs to mind), it's
Well, if you're going to pull cable through it, it better be big. Usually,
individual conductors are pulled instead.
Also make sure to observe the limitation on the number of bends between boxes
(no more than four 90-degree bends in one run).
Doug Miller (alphageek at milmac dot com)
A good compromise is ENT, AKA "smurf tube". It is that blue corrogated
stuff at the Home Depot. It is a fairly low labor factor wiring method
that is just a bit more than Romex to install. It still alows easy
changes. I used a mix of smurf and Romex in my own home, selecting
trhe places where I might change my mind. Smurf is also good for low
I would say the amount of labor involved in running the conduit would
be the biggest problem. The plastic tubing around here (in LI) in not
allowed to be run inside walls... (guess if there is a fire they dont
you to die from the fumes if this stuff when it burns)
If you wanted added protection from rodents etc, why not just bx
wire??? I'd recommend a nice 12/2 wire that can handle 20 amps
if you need it.
... Speaking of wire... WOW COPPER GOT EXPENSIVE!!!!
I was over at HD and noticed romex 250ft 12/2 for $$$102.00
2-3 months ago I bought bx for 81 for 250ft. Romex at that time
Ain't that the truth. I've had to buy wire at several different times in the
last year and a half for various projects. Cost of 250 feet of 12-2:
Feb '05 $32
Nov '05 $38
Jan '06 $56
May '06 $103 -- almost tripled in the last six months.
Doug Miller (alphageek at milmac dot com)
On 16 Jun 2006 06:54:55 -0700, firstname.lastname@example.org wrote:
This sounds more like a testament to the power of the IBEW than the
dangers of ENT. It is basically the same plastic as the jacket of
Romex or what is in RNC (PVC). I bet they can't use PVC plumbing there
If you are going to sleeve the Romex, it should be run as a complete system
from one box to the next so that it is properly grounded. If you want to
run it from one box to a point before the next box, that would be okay if
you install a connector with a smooth bushing at the end. Better would be a
plastic insulated bushing. What you don't want is an isolated length of
conduit with the wires running through it. Without being grounded, a
voltage could be induced into the ferrous metal pipe, turning it into a
capacitor. Now should it be a capacitor and a nail from the sheet rock be
touching it, one might touch the nail and get a good amount of electricity
run through him as he drained the build up to ground.
If you just stick a raw piece of unreamed EMT through the holes of the studs
and run wire through it, you want to know what will happen? Probably
nothing! Probably about the same thing that would happen if you just left
it like it was. Some of us IBEW members need situations like this so we can
show you how much we know.
Personally, I like the smurf tube if your not going to install conduit as a
complete system. I had ancient cloth covered Romex in my old house. I
replaced it with new Romex. I wished I'd left it alone. The squirrels love
the outer sheath of the new Romex. They eat it. Now when I shine a
flashlight in my attic I get these little reflections bouncing back at me.
Some are squirrel eyes and some are bare spots in the Romex. It might be a
bad idea to sleeve these intermittently bare conductors with EMT now, don't
Randy R. Cox
My main gripe is gophers and direct-buried UF cable.
Consider this scenario:
AWG 2-0 aluminum, to a 200A subpanel, in a building
about 100 yards away. UF, direct buried. Gopher city.
What a pain in the @$$. Too cheap to bury conduit?
You'll make up for it in labor costs a couple of years
down the road.
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