NEC 110.14 and 310.16
NEC 110.14 and 310.16
(OP)
Why is there a table for 75 deg C and 90 deg C for less than 100A in Table 310.16 if section 110.14 (c) (1) (a) restricts using anything other than the 60 deg C table?
When was the last time you drove down the highway without seeing a commercial truck hauling goods?
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RE: NEC 110.14 and 310.16
2) Even if you can't exceed the 60° rating you can start with 75° or 90° if/as appropriate when derating conductor ampacity.
RE: NEC 110.14 and 310.16
RE: NEC 110.14 and 310.16
RE: NEC 110.14 and 310.16
RE: NEC 110.14 and 310.16
So if you KNOW what equipment you are getting and you specify 75 deg C termination, you can use that. But remember, this has to apply at BOTH ENDS of the circuit.
The most conservative approach is to size using 60 deg C ampacity up through 110 A and then use 75 deg C above that.
RE: NEC 110.14 and 310.16
UL is loaded with people (idiots as I call them) who have no idea of the proper interpretation of the standards and go off their own guesses which in the end costs you as the customer more money because you have to fight UL on everything.
The last 2 projects I sent through UL ended up costing us twice as much as origionally quoted and that cost increase was due to use having to schedule extra meetings with their supervisors just to tell them the proper way to interpret the standards. Even though they admitted they were wrong we still had to pay for the time to meet and educate their reviewers. They get pretty nasty when you tell them you refuse to pay extra to educate them.
We just took another product through UL and they came back with 27 issues that they raised (none of which we agree with or are correct). We then took that same product (no changes at all) to ETL and it was listed without any issues.
RE: NEC 110.14 and 310.16
Woody