NEC Ampacity Tables

[lakshmipathi23]

I am working on a LV (6ooV)cable sizing calculation using NEC. My installations are are 1C core cables in concrete ducts using conduits. Can any body tell me which is the NEC ampacity table that i have to use for Single conductor cables in the above mentioned laying conditions. And also please let me know what is the NEC table to be used for group derating for the above cables.

 

[S'mise]

1c Core cable? What is that? Can you elaborate? Ambient temp, wire or cable type? Type conduit? Forget about the concrete ducts, its in a raceway.

Around here 1 conductor cable is called wire.

 

[beanland]

Engineering

Engineering

None of the NEC tables will be applicable for single phase wires in single conduits in concrete duct banks. You will need to use the alternate methods to calculate rating. Perhaps the manufacturer has already done this for you?