The average temp in my area in the summer is about 90- 105. as per sec, 310.16 table, if the temp exceeds 86 F ,a correction factor is required, as to derate the ampacity of the conductors. most of the electricians in my area do not apply the rules of 310.16 and 310.15(2)b tables. do you apply the rules of derating ?
Wonder if your AHJ has allowed the non-derated temp to remain as the "accepted" one, since the temp is not year-round, and (hopefully) it gets cooler during the evening. I couldn't find anything specific for this during a (very) brief Code check.
You know the saying..."when in doubt, ask your AHJ"
Re: derating ampacties of service conductors ?#36887 04/18/0410:11 AM04/18/0410:11 AM
Keep in mind, in places with uncommon temperatures, that the equipment within the service itself is raited for certain temp. For instance, if lugs are not supplied with the switch gear, you must make sure they are rated the same temp as the switchgear... lugs come in several temperature ratings, and if they don't say, then they are asumed bye the AHJ to be the lowest rated. just something to add to the mix! Brian