Scooter250
Member
- Location
- Los Angeles
I have 4000A and 2500A underground feeders from two main services to the building disconnects. A code official has concerns with the heat effects of the cables in conduit due their proximity to eachother. It has been stated that the cable ampacities in NEC table 310.15 do not apply because "underground conduit" is not one of the scenerios listed on the table (i.e "Raceway, Cable, or Earth - direct buried).
I have been referring to articles 310.15c - Engineering Supervision and Annex B in an attempt to determine the required ampacity of conductors in this scenerio, however I am coming up unsuccessful.
Does anyone have experience with this and how to find or calculate the adjusted ampacities?
Thanks.
I have been referring to articles 310.15c - Engineering Supervision and Annex B in an attempt to determine the required ampacity of conductors in this scenerio, however I am coming up unsuccessful.
Does anyone have experience with this and how to find or calculate the adjusted ampacities?
Thanks.