HVAC wire sizing NEC

E

electro7

Senior Member
Location
Northern CA, US
Occupation
Electrician, Solar and Electrical Contractor
Was wondering if #10 thhn or thwn conductors are okay feeding this HVAC equipment? Im used to sizing the wire according to the max fuse size of 40A, and that is what is protecting this unit, but was wondering about NEC motor load requirements.

Thanks ahead of time for the help.
e8b1302e8c91673b3b4aabb03b375191.jpg


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Awesome thanks. Whats the NEC code section for that for my reference.

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Another question: so you dont need to multiply the MCA by 1.25 for continuous load?

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electro7 said:
Another question: so you dont need to multiply the MCA by 1.25 for continuous load?
Click to expand...
As Augie stated no. The MCA is typically calculated by the largest load the compressor *125% plus the fan load at 100 %.
 
On average, most all 14 SEER rooftop units use 1034 watts per ton. That metric can be used to get an idea of what to expect if you get a service call for a bid on power install for an RTU. Wire sizing, disconnect, etc.

This is a 5 ton unit, or possibly a 6 ton by manufacturer?
 
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