In a residential setting my boss orders the conduit/wire or NM cable based on the 60C table for pretty much everything up to #1 or 100A. I have mentioned HVAC / motor exceptions before and he shrugs it off. Its simpler that way I guess.
HVAC wire size?
- Thread starter Daja7
- Start date
- Location
- New Jersey
- Occupation
- Journeyman Electrician (retired)
It's his money that he's wasting.
LarryFine
Master Electrician Electric Contractor Richmond VA
- Location
- Henrico County, VA
- Occupation
- Electrical Contractor
If I see an MCA of 16.6a, I'm going to use #12 for the entire run.
electrofelon
Senior Member
- Location
- Cherry Valley NY, Seattle, WA
- Occupation
- Electrician
Yeah, who even keeps #14 THHN on hand
I suggested it a few times, he says it saves money, fewer call backs, more passed inspections, faster job completions, easier layout chart, fewer hassles when HVAC contractor shows up on site a completely different unit, less dancing around with 430 and 440 code sections for all the various AHJ inspectors, home inspectors and owners. This is just residential and mostly NM cable and or liquid-tight 90% 60C anyway.