Wiring 15kw heat stips

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augie47 said:
true, but 310 lsits the ampaciy of the conductor.
240.6 allows you to go to the next standard OCP device, but does not permit you to exceed the conductor's ampacity.
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Yes you are correct, but we are talking about 10KW heatstrips that only pulls 52.083333 including 125% so #6 and a 60a breaker is good.
 
can you provide any documentation that Romex is either THHN or THWN ???:D

(save you some searching... it's not)

battle-weary.. good night
 
William1978 said:
We are talking about 10KW heat strips right? and not any other loads.
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Not in your quote in post #31, Augie's statement was that the conductor can not exceed 55 amps which is correct, 240.4 does not change the ampacity of a conductor.

Roger
 
augie47 said:
can you provide any documentation that Romex is either THHN or THWN ???:D

(save you some searching... it's not)

battle-weary.. good night
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yeah, i thought i read it in the code book...i may be wrong, but don't you derate at the 90 table?....wouldn't that be pretty much saying its thhn(considering also thats it rated for the same places as thhn?)
 
NolaTigaBait said:
i think he's confused...i did say thhn, but i meant thhn in romex(which has thhn conductors)...but should be used at 60
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NM doesn't have marked conductors as required in 310.11, so even though they are a 90 deg type of insulation, they are just 60 deg conductors.

Roger
 
What augie and I both said in our earlier posts was if the calculated load is more than 55A then you can not use the #6NM on a 60A breaker. We did not say the load was more than 55A just if it is then you can't do it.
 
roger said:
NM doesn't have marked conductors as required in 310.11, so even though they are a 90 deg type of insulation, they are just 60 deg conductors.

Roger
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right, i justthought that i read somewhere that the conductors were that of thhn...but bviously i can't use them as 90 conductors...
 
Hey isn't the going thing is to just leave the forum from what I've seen lately that is what you do after a discussion like this.:roll: :-?
 
NolaTigaBait said:
and what we said was that the load was not 55 amps...jeeez
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We are just saying be careful. Sometimes in a situation with 10KW strip heat plus the air handler itself you can exceed 55A

Just don't assume it is ok, make sure up front. That is all we are saying.
 
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