105 degree C wire

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charlie said:
Internal WH wiring for 4500 W elements is normally #12 and rated for 105? C. :)
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Well sure, its a confined space :), some outside lamps ask for it to!
There was a nice thread sometime back about that wire and lamps. AIR!

I thought all "Appliance's" internal wiring was 105?, isn't this where NEMA comes in?
 
bob said:
Are you sure its 600 volt? 105C is generally associated with higher voltage conductor.
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How would that be a code problem using a higher voltage rating than what is required? Kinda like using a # 10 AWG on a 20-amp circuit.
 
dereckbc said:
How would that be a code problem using a higher voltage rating than what is required?
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This is the first thing I noticed.

And also, if you're involved in equipment that has these kind of requirements, Shouldn't you already know of this stuff.

I apologize for being rather unsympathetic, and I do actually mean that, but what you're asking about you should already know.
 
bwyllie said:
don't think i can use AWM since that wiring would be listed for appliances.
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If it is a Branch Panel circuit or any kind of feeder circuit there is no requirement for it to be 105 C wiring in the NEC I know of. Doesn't mean you cannot use it if you want to spend that kind of money, but there is no justification or safety reason you need to use it. There are no terminations made for 105 C.

Now if it is part of the appliance wiring itself, that is another story, but that is a UL issue and not NEC. :confused:
 
physis said:
This is the first thing I noticed.

And also, if you're involved in equipment that has these kind of requirements, Shouldn't you already know of this stuff.

I apologize for being rather unsympathetic, and I do actually mean that, but what you're asking about you should already know.
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I am actually working on reviewing a design & installation that was done by another engineer and electrical contractor. While reviewing the manufs specification it said to use 105 degree rated insulation for the feeders, so to answer your question, I am not already involved with this equipment, this is the first time I have seen this requirement and thus why I am looking to see if anybody else has come across this. no need to apologize for being unsympathetic but you could work on your arrogance.

I know there is no code requirement for the feeders to be 105 degree C but because it is part of the manufs specs it needs to be followed.
 
This is an unusual requirement for branch/feeder ckt type wiring.

What is the actual application?
Maybe call the manufacturer and see what is what. It sounds like maybe this wiring is for the equipment itself where internally heat is an issue.
 
Pierre C Belarge said:
It sounds like maybe this wiring is for the equipment itself where internally heat is an issue.
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That is what I was thinking and why I asked leading questions. If it is for the feeders, heat is a function of current, cable size, raceway, and number of current carrying conductors. You could use 105 C wire for derating calculation purposes, but still the terminal equipment is not rated for 105C terminations. Is it a high heat enviroment or something like a boiler room or furnace?
 
bwyllie said:
. . . While reviewing the manufs specification it said to use 105 degree rated insulation for the feeders . . .
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Did it say "feeders"?
Did they also say "branch circuit"?

. . . I know there is no code requirement for the feeders to be 105 degree C but because it is part of the manufs specs it needs to be followed.
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If the manufacturer doesn't keep that straight, then bummer about replacing feeder conductors. If they mean it, still a bummer.
 
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