Table 310.15(B)(3)
- Thread starter jbolen
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- Location
- Chapel Hill, NC
- Occupation
- Retired Electrical Contractor
50% of 30 = 15 amps assuming you are using 90C wire
- Location
- New Jersey
- Occupation
- Journeyman Electrician
I agree and also assuming a dry location.
- Location
- Lockport, IL
- Occupation
- Retired Electrical Engineer
Help me out here. I see that XHHW appears in both the 75C and 90C columns. I had not noticed that before, as I never specify that type insulation. So how does one determine whether the wire you buy is the 75C version or the 90C version? :?
curt swartz
Electrical Contractor - San Jose, CA
- Location
- San Jose, CA
- Occupation
- Electrical Contractor
XHHW = 75C Wet Locations and 90C Dry Locations
XHHW-2 = 90C Wet and Dry Locations.
XHHW-2 = 90C Wet and Dry Locations.
- Location
- Chapel Hill, NC
- Occupation
- Retired Electrical Contractor
Yeah that surprised me years ago that a wire in a wet location is rated less than in a dry location. If the insulation has a -2 after the letters then it is 90C for both wet and dry as Curt mentioned above.
- Location
- Lockport, IL
- Occupation
- Retired Electrical Engineer
OK. Thanks. And now that I have learned something new today, an event that should happen every day, I can go home. Right? :lol:
- Location
- Chapel Hill, NC
- Occupation
- Retired Electrical Contractor
Enjoy the day-- it's beautiful out here in NC
- Location
- New Jersey
- Occupation
- Journeyman Electrician
Yes the devil is in the details. If this were a test question you would really need to know if the location were wet or dry. Wet drops you below 15 amps after derating.
petersonra
Senior Member
- Location
- Northern illinois
- Occupation
- engineer
I think the other posters have covered it pretty well, however, I would suggest that sometimes the answer comes in the form of another question that goes something like "why would anyone do that?".
winnie
Senior Member
- Location
- Springfield, MA, USA
- Occupation
- Electric motor research
Heck, if this were a test question you would need to know the sort of load being served. If this were a bunch of motor circuit conductors.....
-Jon
-Jon
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