This may be a bit off topic, however, I have just wired in an electric
heater for my shop. The heater is a 208/240V @ 19.6 amps. The breaker that
supplies my shop (detached) is a double pole 10A 10AWG 3+ground.
Question is: If the main breaker from the panel is 10A, is that per voltage
lead, or overall. If the heater requires almost 20A, then do I want a 220
single pole (double 20A with trip cap on top) or double 10A.
Any help appreciated
The good news is the cable is correct for the heater. The bad (sorta)
news is that the double pole 10 amp breaker is going to limit you to 10
amps at 240V. What you need is a 2 pole 30 (yes, thirty) amp breaker. As
a rule, no circuit should be loaded to more than 80% of capacity, which
is 18 amps on a 20 amp circuit.
Code calls for #10 AWG wire for a 30 amp load, so the cable is OK,
just replace the breaker with a 2 pole 30 Amp one, hook one colored wire
(red or black) to each of the poles, and you should be good to go.
Just one thing else: get the receptacle to match the plug on the
heater cord, or if no cord, get a 250VAC, 30 Amp plug and receptacle,
and some 10/3 SO cord to hook it up, and you are well on your way....
Brian Klar wrote:
I have changed the breaker in the home box to 30A. For a test, I turned the
heater on, all the lights, and ceiling fan, along with the table saw and
miter saw. All went fine, without a hitch.
Thanks to all,
Bob Walters wrote:
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