designer82
Senior Member
- Location
- Boston
I have a situation where the contractor needs to install parallel sets of cables in an underground conduit for the service.
System is 120-208, 3ph-4w
Occupancy is Multi-Family residential
I have to derate for more than 3 CCc per Table 310.15(C)(1)
Question is do you use 4-6 or 7-9 for number of conductors?
I believe the neutral would not count as a CCC but Table 310.15(C)(1) says Number of Conductors (not Number of CCC conductors).
Of course, to complicate things the asterisk below the table says:
*Number of conductors is the total number of conductors in the raceway or cable, including spare conductors. The count shall be adjusted in accordance with 310.15(E) and (F).
System is 120-208, 3ph-4w
Occupancy is Multi-Family residential
I have to derate for more than 3 CCc per Table 310.15(C)(1)
Question is do you use 4-6 or 7-9 for number of conductors?
I believe the neutral would not count as a CCC but Table 310.15(C)(1) says Number of Conductors (not Number of CCC conductors).
Of course, to complicate things the asterisk below the table says:
*Number of conductors is the total number of conductors in the raceway or cable, including spare conductors. The count shall be adjusted in accordance with 310.15(E) and (F).