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Conductors in Exhaust Plenum

davidkien68

Dec 26, 2014
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Dec 26, 2014
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Hi all.

We have a condition where existing 5kv conductors in RGS cannot be moved. To accommodate a new short run (25') of exhaust duct work that will only be exhausting air from a utility substation, the exhaust ductwork will wrap around the existing 5kV conductors in RGS. Don't worry about the plenum rating of conductors for now. Just looking for the procedure to determine the derating of the conductors in the exhaust duct. I think this is simple as looking at the NEC table for the specific exhaust temperature air and conductor derating factor.

Am I missing something else?

Thanks.
b
 
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