wrote in message
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On Sun, 24 Jun 2007 11:36:02 -0400, "RBM" rbm2(remove
wrote:

Yes, but what Bill Allerman posted is important as well. The feeder cable
must be sized for a 40 amp breaker, which would be at least #8. Look on
the
unit's name plate for an amperage rating or even a recommended circuit
breaker size. The full load amperage will determine the size wire and
breaker required

Nope, not on an HVAC condenser. Read the label on the condenser and
size the breaker/wire accordingly
You should see miminum circuit ampacity, that is the wire size based
on 301.16 (not 240.4(D) so 12ga is good for 25a, 14ga 20a.

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It is a violation of code to put a 20a breaker on 14ga wire! 12ga is
required!!!!!!!


Then look at maximum branch circuit over protection size and that is
the breaker you can use.
It will NOT be what you would think. This is for short circuit
protection, not overload protection, that is internal in the
compressor as a general rule.
You can very well see a 40a breaker on 14 ga wire.

All that said you still have to wire and protect the heater strips in
the air handler like a regular circuit, using the 310.16 rating on the
wire. Again that will be in the installation instructions as to what
wire and breaker combo you need for each heater option size.