It doesn't make any difference *what* the device is, it still doesn't matter.
Think about it: people connect 1-amp (or less) devices to 15- or 20-amp
circuits all the time. Nobody except Stormin Mormon ever dreams there's a
problem with plugging a table lamp into a circuit with a 15A breaker.
The exception you're thinking of with regard to welders refers to (for
example) using a 30-amp device on a circuit with a 20-amp breaker.
Read Article 630 of the NEC. Welders have special rules on the size
of branch circuit conductors, because the duty cycle may be less than
100%. They are also exempt from the small conductor ampacity rule
240.4(D), so it may be allowed to use a #14 copper conductor on a
breaker larger than 15 amps.
The real; problem with this idea is most small MIGs use a regular 5-15
plug so that will be considered a general use receptacle. Overloading
with other equipment down the road is a very real possibility.
If you are going to violate the code, his idea of paralleling the 14ga
is a lot safer violation. (if there is such a thing)
Well, if the welder has a 5-15 plug and #14 calcs out as an acceptable
branch circuit for the welder, I don't see any violation there. But
as you point it, it would be advisable to use a single receptacle and
to label it as for welder use only.
The panel is in the basement, about 50 ft laterally from the garage with all
drywalled walls and ceilings in between. (Its now in a bedroom)
I don't know why the DOOFUS electrician didn't put the panel in the
(attached) garage whe they were building the house. It would have been
about 40 ft more "copper" to put it in there.
I'da paid it.
Does the welder have a NEMA 5-15 plug or a 5-20 plug? If it's a -15
plug (has parallel prongs) they are not serious about the 20A rating and
you can ignore it -- see what happens, you can run a new circuit later
if you need to.
You've already figured out by now that you can't do a "ring" circuit
(like I think they do in England) with the 14 ga cables.
Ok, you've discussed in depth doubling 14/2's to increase the
amperage, but here's a similar question with a twist.
Could I double 12/2's while keeping it protected with a 20A breaker?
I'm thinking of a long run where I would be trying to compensate for
voltage drop rather than trying to increase current capacity. The
broke wire senario wouldn't apply since the circuit would still be in
specs. And yeah, I could buy 10/2 but I've got a lot of spare 12/2.
The National Electric Code only allows that with really big conductors
(*really* big, but I don't remember the cutoff size, something like
4/0.) But I can't think of any reason it would be unsafe if you just
did it anyway and didn't tell anybody.
How far are you running? The voltage drop in 12ga wire is not as much
as you'd think.
One very important reason for codes is to insure that when you
are working on a system someone else put in, you know what to expect.
When working with wiring, the unexpected is what is dangerous.
Code is code, it is there for a reason. If you don't know why
it is the way it is, then it is even more important that you follow
the code exactly. If you think you know what it is the way it is,
then that is also a good reason to follow the code.
I have a triple gang box in the basement. Two of the switches are running
from the normal/expected breaker but the third is a "3 way" which has power
running to it from a different breaker. What does the "code" say about how
to alert the "next guy" about this ? So far, I've written this info on the
back of the decora plate with a Sharpie hoping the next guy can READ.
Not legally, no. In general, conductors smaller than 1/0 are not allowed to be
connected in parallel. There are a few exceptions, but none of them apply in
residential situations. [2005 National Electrical Code, Article 310.4]
Its a 5-15, Bob. The manual says it will work on "position 1" (Lowest
setting) on 15A circuit.
Guess I'll fire it up on a 15 and see what happens if I switch to 2, 3, and
Sounds like I can work thru the unused 30A "RV" outlet on the outside of the
garage and end up with a 20A "inside"
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