In follow-up of the original question, are Amp insulated crimp type
spices acceptable for this purpose? Is their insulation sufficient
for the application (115 volt branches), or should they be
additionally shrink-wrapped or covered with electrical tape?
I know this method will work, but my question is: Will it be up to
It depends on the splice and the tool you use. Inspectors may ask to see the
I wouldn't use the ones at the radio shack or on the low voltage aisle at Home
You can say all the bad things you want about wirenuts but the inspectors are
used to seeing them.
I would give you a conditional yes. The rule is actually sort of confusing,
using language like "...the conductors, splices and taps shall not fill the
wiring space at any cross section to more than 75%" 2002 NEC art 312.8.
Generally speaking, if you do neat work and don't clutter up the "wiring space"
any reasonable inspector will hold his nose and say OK.
If you end up with a huge number of wires that need splicing it is probably
better to put in a big junction box. Home Depot has them up to 12x12 I think. I
ended up with one about 9x9 when I did my panel upgrade. I got some barrier
strip terminal blocks and made the box easy to deal with. I kept the neutrals
and hots together on adjacent strips, one next to the other and used one big
common bar for the grounds. That was bonded to the main with a 4ga copper.
Instead of splicing to get the original wires to the bottom of the column of
breakers, I'd suggest arranging all of the "old" wires to the upper part of
the new box. (half on the right side, and the other half on the left side)
And then any new wiring you do would be added to the bottom portion. (right
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