steve66 Senior Member Location Illinois Occupation Engineer May 4, 2012 #1 Table 310.77 lists the ampacity of 500 KCM copper cable at 505 amps for 105 deg. C cable. Doesn't the same 75 deg. termination limit apply to HV cable that applies to wire under 600 volts??
Table 310.77 lists the ampacity of 500 KCM copper cable at 505 amps for 105 deg. C cable. Doesn't the same 75 deg. termination limit apply to HV cable that applies to wire under 600 volts??
J jim dungar Moderator Staff member Location Wisconsin Occupation PE (Retired) - Power Systems May 4, 2012 #2 steve66 said: Table 310.77 lists the ampacity of 500 KCM copper cable at 505 amps for 105 deg. C cable. Doesn't the same 75 deg. termination limit apply to HV cable that applies to wire under 600 volts?? Click to expand... Yes, kind of. The NEC requires you to consider the temperature rating of the termination, it does not list a specific value. Most MV terminations are rated at 90?C minimum while most <600V are at 75?C.
steve66 said: Table 310.77 lists the ampacity of 500 KCM copper cable at 505 amps for 105 deg. C cable. Doesn't the same 75 deg. termination limit apply to HV cable that applies to wire under 600 volts?? Click to expand... Yes, kind of. The NEC requires you to consider the temperature rating of the termination, it does not list a specific value. Most MV terminations are rated at 90?C minimum while most <600V are at 75?C.
