PV system dc and ac conductors in the same enclosure or wireway must be grouped separately with cable ties or similar means at least once and at intervals not to exceed 6 ft [690.
Because of the intrinsic temperature characteristics of photovoltaic modules, an increase in temperature results in a loss of output power. In hot summer conditions, the back side of a module can reach up to 70 °C, while the working layer of the solar cells inside may exceed 80 °C.