S7VEN
Member
- Location
- Los Angeles, Ca
hello, I'm practicing some conductor ampacitie adjustment factors in emt and I would like to know what Iam doing wrong.
for example:
what's the allowable ampacitie of 9 #12 THHN current carrying conductors in a 1/2 EMT?
1/2 EMT - 9 #12 THHN
7-9 Adj. 70%
#12 THHN 90?c - 30 amps
30 x .70% = 21 amps
so good for a 20 amp breaker ?
although the ** by #12 sends you to 240.4(D)
that's only referring to max ocpd
so you still derate at 30 amps correct ?
9 wires in 1/2 at 20 amps.
doesnt sound like anyone would do that..
help ?
thank you
for example:
what's the allowable ampacitie of 9 #12 THHN current carrying conductors in a 1/2 EMT?
1/2 EMT - 9 #12 THHN
7-9 Adj. 70%
#12 THHN 90?c - 30 amps
30 x .70% = 21 amps
so good for a 20 amp breaker ?
although the ** by #12 sends you to 240.4(D)
that's only referring to max ocpd
so you still derate at 30 amps correct ?
9 wires in 1/2 at 20 amps.
doesnt sound like anyone would do that..
help ?
thank you