A bank of batteries with capability of supplying 250A and a maximum voltage of 325V is housed in a concrete structure in a very humid location. There is service access alsie between rows of batteries. What is the REQUIRED safety distance between the rows of batteries.

A PV system equipped with rapid shutdown requires a label stating ''RAPID SHUTDOWN SWITCH FOR SOLAR PV SYSTEM''.
Which is the BEST description of where this label is required?

A AWG THWN-2 PV output conductors from two PV arrays are run in the same 3 in, conduit to their respective functionally grounded inverters in the building. The three PV source circuits are each protected by a
15A fuse in the combiner box at the array. The conduit, which is strapped directly to the roof,is exposed to design temperatures of 140' F (60'C) during its 30 ft.
Exposed run. What is the MAXIMUM current carrying capability value of the PV output conductors?

According to the NEC, where on a residential PV system MUST the labeling describing the type of rapid shutdown be located?

An installer troubleshooting a ground-mounted array finds It to be performing as expected most of the time, but a ground-fault error is indicated on hot days. The inverter is in a shaded location. Which of the following should theinstaller check for FIRST when troubleshooting this array?