I have just enough 10/3 to run a circuit in my garage if I run the cable
under an aluminum threashold. It fits under there like it was designed for
the purpose, but that doesn't mean it is okay... The cable will go through
studs on a wall, down under the threashold, and continue through the wall on
the other side.
Obviously I will have to be careful to avoid snagging the jacket on any
edges, but other than that is there any inherent reason not to do it?
The alternative is to go over the door, and I would have to buy a roll of
cable to do that. Since I don't anticipate ever using 10/3 again, I would
really like to use up what I have rather than buying even more.
I won't address the "under the threshold" question 'cuz even though it
doesn't sound like it would be OK, I really don't know. However...
Any decent electrical supply house, like a lighting store with a parts
counter, will sell you any length of 10/3 that you need, by the foot.
Your borg might also stock it on spindles and sell it by the foot. No
need to buy a whole roll.
An electroction waiting to happen at worst, a failed future home
inspection at best. Why not splice your 10/3 in an outlet box near
the door. You can avoid the full roll by buying a short piece
'by the foot'. Outlets are always handy.
How do you figure it is an electrocution waiting to happen? It would have
to penetrate the jacket and the insulation on a hot without making contact
with the ground, neutral, or other hot. And then someone would have to
touch the threashold and be a better ground than the what the threashold is
mounted on. I doubt you could do all that if you tried. A short maybe, but
an electrocution is all but impossible.
Why would it fail a house inspection? I guess that is my question; is it
somehow improper. To me, it appears that the threashold is protecting the
cable as it crosses the doorway, but it might somehow be forbidden.
Oh, please. I usually try the same technique, making a point to use
the word, and spelling it correctly. But someone else did that and it
didn't work here.
It affects the answer. As I said, if you want more info than you got
here, like from the web or groups.google, you have to spell it right.
Well, maybe it would correct you, but I didn't think of that.
This was not a flame, meaant to irritate you. It was a correction,
meant to help you. You ought to be able to handle that.
I'd not do it. While it may last 100 years, it may be a problem in two
years. Thresholds often get wet and dirty. Doors get replaced. It is not
the common "workman like manner" to have a wire. If the next owner decides
to replace the door, he may chop or cut into the threshold and cut the wire
as it is not expected to be there. It may even be you once senility sets
Edwin has hit on my thinking...
If it isn't the only way to route the cable for other reasons than the
initial want to save a few pennies, I'd vote for "No" for those reasons.
_IF_ (the proverbial big if which I think has already been ruled out
here) it were the only rational way across the doorway, and I were
confronted w/ the problem I don't believe I would simply lay the cable
under an Al (I presume) threshold but would make a cable channel in the
sill plate or subflooring and protect that per Code for nailing into by
a metal plate over it (not that I'm recommending doing that or
anything... :) )...
It's a very unusual place to run a wire, and that means that no one
would hesitate to take a Sawzall or crowbar to the door and threshold
to remove it. Someone might try to throw in a couple extra screws to
hold the threshold down if it loosens over the years.
As someone who performs selective house surgery during remodeling for
others, I have encountered far too many "it seemed like a good idea at
the time" solutions. Your threshold-as-conduit solution is one of
them. Could it work? Sure. Is it a good idea? No.
I realize you're trying to utilize the cable remnant, but saving money
doesn't factor into the safety issue. The difference in price doesn't
justify the lazy man's solution. BTW, you could always sell the 10/3
you have on Craiglist and buy what you need.
Reasons not to do it...
Some tiler or carpenter in 5 years is going to come along and drive a
screw or nail through it because nobody expects a wire to be there.
When the threshold gets loose a future homeowner will drill a hole in
the aluminum and shoot a screw there to tighten it, (provided they get
to the screwing part after the shock of drilling into it).
If movement causes the hot to contact the aluminum you have an
If movement causes the neutral to contact the aluminum you have a
hidden danger in that your whole circuit has lost its proper ground,
because potentially a portion of the ground path is now carrying the
load or portion thereof.
It doesnt pass the "snicker" test even if the code books dont address
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