Rewiring an old house to put more plug ins etc. Fishing wire down the walls
to the basement. Now I have a bunch of wires I want to put on a few
circuits. I want to run wires from breakers to a large junction box, then
tie the wires together in there that will go to each circuit. As long as I
don't go over the boxes rating for wires, can more than one circuit be
served by one box? Or should I have a separate box for each circuit?
I did a net search for this and only found one post where a fellow said it
was ok if you put a warning on the box cover that it is served by more than
I want this to be to code.
Also found one fellow who said he was an electrician and said that all power
to that junction box must be killed by the flipping of a breaker. So it
could only service a maximum of two breakers that were tied together.
The amount of time and expense compared with the cost of the wire, it might
be easier to run all of the wires back to the panel. I believe you should
consider professional help on the lay out. Might save you a lot of money and
I don't need professional help with a layout. I have a code book and they
give circuit runs for a sample house. I don't think you under stand what I
am doing. I am running wires from the upper floor and attic to the basement
to put new wires in for plugs, light switches and ceiling lights. Often it
is MUCH easier to run a wire from each box right to the basement and then
tie wires together and then run one wire every so often as dependent on what
one circuit will draw back to the breaker box. I do this because to have to
run a wire to the basement from a box and then back up to the next box and
then back down, would probably more than double the time it is taking me to
drop a wire each time. I am connecting the wires in accessible metal boxes
with less wire and marrets than the code allows and covering with a metal
plates. No headaches - I just wanted to know if I can run more than one
circuit in a junction box as my code book does not address it. From the
responses it seems like it is allowed, but I think I will use one box for
one circuit. I know what I did, but the next homeowner will not.
If you label them (which you'll almost have to do anyway or pull and
connect them separately) then you'll plus anyone else can tell at any
time....as long as you have large enough boxes for the number of wires,
Code doesn't specify, but your local jurisdiction may have an
interpretation that does. The NEC doesn't require a warning, but it's
not a bad idea. I'd label the box with the breaker numbers. But
personally, I'd use one box per circuit anyway.
Small boxes are cheap. Use a separate box for each circuit. It's normal
to make the junctions at a light or wall receptacle, by running the
wire farther out. Don't forget a new owner or a tenant won't be aware
of your wiring tricks. He'll think flipping one breaker will make him
OK then, and remember junction boxes are not allowed to be closed in,
covered up in any way, which is why inspectors don't like them,
especially in an unfinished area, where the temptation will be to
drywall right over them later on. Eventual corrosion of the wire ends
is probably the concern there. So it is always best to pull more wire
through and go to an outlet, where your junctions will always be
No reason you can't, as long as all the connections are properly
contained within wiring boxes and the expected loads are within the
current capability of the breaker/wire size, which it sounds like they
should easily be.
(Don't forget the ground leads.)
If I remeber correctly, your power supply is a transformer? Check the
capacity of the power supply and make sure it can handle the load(lights).
I'm assuming the lights are all the same voltage rating.
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