2 4ton cac units 125' from panel.

[aftershock]

Single phase residential.
What size NM wire would you run and why?

 

[aftershock]

I'm going to run 4/2 nm.

 

[texie]

Single phase residential.
What size NM wire would you run and why?

CAC..condenser a/c unit?
If so, can't answer this without the MCA from the nameplate.

 

[aftershock]

CAC..condenser a/c unit?
If so, can't answer this without the MCA from the nameplate.

A seer 10 would pull about 7.5 amps per ton.
A 13 about 7 amps.

 

[texie]

A seer 10 would pull about 7.5 amps per ton.
A 13 about 7 amps.

Well, that may be a good round number but you still need the MCA to properly and safely size this circuit.

 

[aftershock]

Well, that may be a good round number but you still need the MCA to properly and safely size this circuit.

I never get to see the nameplate until trim out.

 

[Gregg Harris]

I'm going to run 4/2 nm.

Most 4 tons depending scroll or recp compressor will be 26 to 30 MCA. If you have model # or equipment brand I can probably give you the MCA.

 

[texie]

I never get to see the nameplate until trim out.

Kind of like roughing in a kichen without a final cabinet plan and complete appliance specs, it usually does not end well.

 

[A/A Fuel GTX]

I'm going to run 4/2 nm.

I'd say #8CU would be more than adequate.

 

[stickboy1375]

I'm going to run 4/2 nm.

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.

 

[aftershock]

Kind of like roughing in a kichen without a final cabinet plan and complete appliance specs, it usually does not end well.

actually I don't have that info either just the aerial view.

 

[aftershock]

Most 4 tons depending scroll or recp compressor will be 26 to 30 MCA. If you have model # or equipment brand I can probably give you the MCA.

I do know Goodman will be the brand.

 

[Gregg Harris]

I do know Goodman will be the brand.

Package unit or split system?

 

[kwired]

I'd say #8CU would be more than adequate.

For supplying two units? Remember NM cable is also sized per 60^oC 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 @ 60^oC 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.

 

[aftershock]

Package unit or split system?

split.

 

[aftershock]

For supplying two units? Remember NM cable is also sized per 60^oC 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 @ 60^oC 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.

that is why I chose #4

 

[Gregg Harris]

split.

GSC 13=23.9 MCA # 8

GSX 13= 26.3 MCA # 8

SSX14 =26.4 MCA # 6

SSX 16 = 26.4 MCA # 6

DSX 16 = 27.5 MCA # 6

DSX 18 =29.3 MCA # 6

 

[A/A Fuel GTX]

For supplying two units? Remember NM cable is also sized per 60^oC ampacity tables.

.

I was assuming they were two separate 4 ton units. That would put the MCA around 30A for each one.

 

[kwired]

I was assuming they were two separate 4 ton units. That would put the MCA around 30A for each one.

:You suggested 8 AWG would be fine, OP is asking about size of feeder supplying both units not an individual branch circuit.

 

[aftershock]

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.