This may be pure ignorance on my part. Never the less, I'll post the question because I am confident in the level of expertise and knowledge within this forum. I'm constantly impressed.
I recently received bid documents which specified the use of Houston Wire # HW254 "Diesel Locomotive Car Wiring (DLO) 2000 volt, 90 deg C, RHW-2 or RHH cable for underground feed via (3) 4" conduits from A/C drive to 1000 HP A/C motor.
A fellow competitor said this cable was specified beause it has greater ampacity capacity than THHN/THWN. Is there any truth to this?
The bid docs do not provide termination ratings for the A/C drive.
With respect to Article 310.10, 310.15 and 310.16, where is a provision to allow greater ampacity other than 310.15(C) or Annex B " which require engineering supervision".
Thanks for the insight.
I recently received bid documents which specified the use of Houston Wire # HW254 "Diesel Locomotive Car Wiring (DLO) 2000 volt, 90 deg C, RHW-2 or RHH cable for underground feed via (3) 4" conduits from A/C drive to 1000 HP A/C motor.
A fellow competitor said this cable was specified beause it has greater ampacity capacity than THHN/THWN. Is there any truth to this?
The bid docs do not provide termination ratings for the A/C drive.
With respect to Article 310.10, 310.15 and 310.16, where is a provision to allow greater ampacity other than 310.15(C) or Annex B " which require engineering supervision".
Thanks for the insight.