2 4ton cac units 125' from panel.

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aftershock said:
I'm going to run 4/2 nm.
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I'd pull # 2/3 SER AL., just to cover my ass and charge accordingly because the specs were not present. Plus this gives options later on when they need to add something. Win/Win in my book. I bet i come out cheaper than the copper you propose to run.
 
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A/A Fuel GTX said:
I'd say #8CU would be more than adequate.
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For supplying two units? Remember NM cable is also sized per 60oC ampacity tables.

Depending on just what the nameplates of the units say 6 AWG may work, but could be close to being too small, with 125 feet of length 4 AWG may be a good idea for voltage drop purposes even if 6 is acceptable for ampacity reasons.

I say this without any calculations other than simple ones from memory, but I think is fairly accurate. I know 6AWG @ 60oC is only good for 55 amps, so if MCA of units is over 27.5 amps you need to look pretty carefully before selecting 6 AWG NM cable.
 
kwired said:
For supplying two units? Remember NM cable is also sized per 60oC ampacity tables.

Depending on just what the nameplates of the units say 6 AWG may work, but could be close to being too small, with 125 feet of length 4 AWG may be a good idea for voltage drop purposes even if 6 is acceptable for ampacity reasons.

I say this without any calculations other than simple ones from memory, but I think is fairly accurate. I know 6AWG @ 60oC is only good for 55 amps, so if MCA of units is over 27.5 amps you need to look pretty carefully before selecting 6 AWG NM cable.
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that is why I chose #4
 
Reason I brought this up is because of a TC. Same units, older house shorter run, but #6 was used and the units were tripping the 60 amp breaker. Now I am fixing to wire similar but longer run.
 
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