You can bundle cables togther, but you will have to derate as shown by 310.15(B)(2)(a)
You said 10-15 cables, I figure 12 2 wire circuits makes 24 current carrying conductors, derate to 45% so
240.4(B) allows next standard OCPD
#14 = 11.25 amps Still on 15 amp breaker
#12 = 13.5 amps now on 15 amp breaker
#10 = 18 amps now on 20 amp breaker
I have added the following:
Curt pointed out (see below)I was wrong with the application of 240.B, going up to the next standard breaker is prohibited for outlet circuits which some of these are likely to be.
In this case the #14 and #12 would be on 10 amp OCPDs and the # 10s on 15 amp OCPD
[This message has been edited by iwire (edited 02-15-2003).]
