690.35 Ungrounded Photovoltaic Power Systems.
power systems shall be permitted to operate with
ungrounded photovoltaic source and output circuits where
the system complies with 690.35(A) through (G).
All photovoltaic source and output circuit
conductors shall have disconnects complying with 690,
(B) Overcurrent Protection.
All photovoltaic source and
output circuit conductors shall have overcurrent protection
complying with 690.9.
(C) Ground-Fault Protection
. All photovoltaic source and
output circuits shall be provided with a ground-fault protection
device or system that complies with (1) through (3):
(1) Detects a ground fault.
(2) Indicates that a ground fault has occurred
(3) Automatically disconnects all conductors or causes the
inverter or charge controller connected to the faulted
circuit to automatically cease supplying power to output
The photovoltaic source conductors shall consist of the
(1) Nonmetallic jacketed multiconductor cables
(2) Conductors installed in raceways, or
(3) Conductors listed and identified as Photovoltaic (PV)
Wire installed as exposed, single conductors.
The photovoltaic power system direct-current circuits
shall be permitted to be used with ungrounded battery systems
complying with 690.71(G).
The photovoltaic power source shall be labeled with the
following warning at each junction box, combiner box, disconnect
and device where energized, ungrounded circuits
may be exposed during service:
ELECTRIC SHOCK HAZARD.
THE DC CONDUCTORS OF THIS
PHOTOVOLTAIC SYSTEM ARE UNGROUNDED
AND MAY BE ENERGIZED.
The inverters or charge controllers used in systems
with ungrounded photovoltaic source and output circuits
shall be listed for the purpose.