I have a stove that uses a 60A circuit. I am going to be replacing it
with two devices: One a 240V 40A device, the other a 240V 20 A
Question: Can I use the 60A wire as a source for both the 40A and 20A
circuits, by putting in a small 60 or 70A breaker box behind the new
oven, and add 20A and 40A breakers to get the configuration I need?
Or do I just have to abandon the current wire, and run two new ones
from the main box?
Just be sure that the existing wire has 4 conductors (2 hot, 1
neutral, 1 ground). You'll need all 4 to wire up the new sub-panel. I
just tried to do the same thing with a 50 amp circuit that was
powering a dryer. Once I started looking into things, I discovered
that the dryer had a 3 prong plug. I ended up running new 6/3 wire
from the main box to the new sub, and using the old wire to go from
the sub to the dryer.
50 or 60? Range circuits are usually 50.
If both of these are listed to be on a 50a circuit you can just
connect them directly. The pigtails are considered "taps" and
specifically allowed in the NEC
210.19 (A)(3) ex1
Exception No. 1: Tap conductors supplying electric ranges,
wall-mounted electric ovens, and counter-mounted electric cooking
units from a 50-ampere branch circuit shall have an ampacity of not
less than 20 and shall be sufficient for the load to be served. These
tap conductors include any conductors that are a part of the leads
supplied with the appliance that are smaller than the branch circuit
conductors. The taps shall not be longer than necessary for servicing
Any breaker box you install has to be easily accessible. It can't be "behind
the new oven". You also must have separate neutral and ground conductors in
the feeder cable and keep them separate in the new breaker box if either of
your new loads requires a neutral for 120 volts.
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