Where the conductors of more than one PV system occupy the same junction box or raceway with removable cover(s), the AC and DC conductors of each system shall be grouped separately by wire ties or similar means at least once, and then shall be grouped at intervals not to exceed _____.
a) 6 in.
b) 12 in.
c) 36 in.
d) 6 ft
See answer and applicable Code reference
The correct answer is: d) 6 ft
PV system installation requirements are outlined in Sec. 690.4 of the 2011 NEC. As noted in 690.4(B)(4), the grouping of conductors of more than one PV system occupying the same junction box or raceway shall be grouped at intervals not exceeding 6 ft.