Conductors in Exhaust Plenum
Conductors in Exhaust Plenum
(OP)
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
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






RE: Conductors in Exhaust Plenum
http://www.ecmag.com/section/codes-standards/wirin...
RE: Conductors in Exhaust Plenum
For cable in conduit in air you may use IEEE 835/1994 IEEE Standard Power Cable Ampacity Tables- Horizontal Conduit in Air [type 1 5 kV unshielded or Type 3 for shielded.]