I know I have seen this on the forum before but when searching for "DLO" it came up with no results, so hoping someone can help me out. for a installation using DLO cable manufacturers typically list the ampacity of the 90? Free air rating, where would you find the calc. to find the 75?C rating for installations in conduit? I aslo assume the derating factor for more than three CCC in a raceway or conduit would still match what is listed in the code.
DLO Cable Ampacity
- Thread starter Mike01
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Your cable must also listed with an insulation that is recognized by the NEC, you must use the proper column in Table 310.16 and choose a row that is the next lower standard wire size to then figure the ampacity.
Try this link for cables in conduits.
http://www.generalcable.com/NR/rdon...6-E527283DB631/0/Pg27_SVTrnWldgTy_RHH_RHW.pdf
http://www.generalcable.com/NR/rdon...6-E527283DB631/0/Pg27_SVTrnWldgTy_RHH_RHW.pdf
- Location
- Illinois
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- retired electrician
The ampacities in the 600 volt chart on that link are the 90?C Table 310.17 (free air) ampacities and cannot be used for a conduit installation. The cable is listed as RHH/RHW and can be used for NEC applications, but you would have to use the ampacities in T310.16.
ampacity
ampacity
Don, thanks I was not sure if there was a calc. for this when I get back to the office I was going to double check in the IEEE Brown book the cable specifications sheet indicated DLO-RHW cable so I would just use 310.16 but for the 535 cable would you use the 500kcmil??
ampacity
Don, thanks I was not sure if there was a calc. for this when I get back to the office I was going to double check in the IEEE Brown book the cable specifications sheet indicated DLO-RHW cable so I would just use 310.16 but for the 535 cable would you use the 500kcmil??
Yes he would, he has stated as such in the past.
- Location
- Illinois
- Occupation
- retired electrician
I would be ok with running the 535 at 400 amps, but can't support that with the code. The amps/cm go down as the size of the cable increases, so there is no easy way to get the NEC ampacity of a 535 kcmil conductor.
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