Wire Sizing- NEC VS Manufacturer Spec Sheets

[Davinjw]

I'm looking for High Flex cable good for Cable Trays and able to carry 400A. (800A Paralleled)

According to NEC, using the 75*C Column I need 500KCM to carry 400A.

according to the quote I got back with the following spec sheet, my cable is good for 704 Amps, and a 262KCM would carry my 400A load.

Trying to figure out if a Spec Sheet for a UL'ed product supersedes the NEC.

Thanks!

http://distributorwire.com/specs/2kvdlo.html

 

[Jraef]

I'm looking for High Flex cable good for Cable Trays and able to carry 400A. (800A Paralleled)

According to NEC, using the 75*C Column I need 500KCM to carry 400A.

according to the quote I got back with the following spec sheet, my cable is good for 704 Amps, and a 262KCM would carry my 400A load.

Trying to figure out if a Spec Sheet for a UL'ed product supersedes the NEC.

Thanks!

http://distributorwire.com/specs/2kvdlo.html

Their rating is for 90deg C as "Locomotive" cable, you cannot use that rating. So you must use it based on the RH/RHW rating in the NEC table for 75C, which by the way says 500kCMIL is 380A for 3 conductors, but if you parallel, you have to de-rate to 80% for 6 conductors. So for 800A you will need 2 x 900kCMIL, or if you want to use that 262 DLO, you would need 4/phase.

Using DLO is not as straightforward as the vendors want you to think. You also MUST use approved lugs for Type K stranding or better, and very few mechanical lugs are approved for that. So you then usually end up having to use approved compression lugs and the special dies for them.

 

[iceworm]

Their rating is for 90deg C as "Locomotive" cable, you cannot use that rating. So you must use it based on the RH/RHW rating in the NEC table for 75C, which by the way says 500kCMIL is 380A for 3 conductors, but if you parallel, you have to de-rate to 80% for 6 conductors. So for 800A you will need 2 x 900kCMIL, or if you want to use that 262 DLO, you would need 4/phase. ....

Just asking: The OP said "cable tray". Does one need to derate to 80%?

ice

 

[don_resqcapt19]

In general all of the manufacturer's ampacities for the "DLO" type cables are based on 90°C and the cable being in free air. It is not too often that you can use those ampacities for an NEC application.