ElecPwrPEOct11
Well-known member
For 300kcmil, TW, 60 degree cable the question asks what's the largest allowable overcurrent device:
A) 150A
B ) 180A
C) 200A
D) 225A
The allowable ampacity of the conductor is 190A from the NEC. However this is not a standard ampere rating per 240.6. NEC 240.4 (B ) allows you to round up to the next highest standard size 200A, except in a couple of very specific instances. Due to this, 200A is the correct answer. Can someone explain why the given solution of 180A is instead correct? Thanks.
A) 150A
B ) 180A
C) 200A
D) 225A
The allowable ampacity of the conductor is 190A from the NEC. However this is not a standard ampere rating per 240.6. NEC 240.4 (B ) allows you to round up to the next highest standard size 200A, except in a couple of very specific instances. Due to this, 200A is the correct answer. Can someone explain why the given solution of 180A is instead correct? Thanks.