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(A) PV System Grounding Configurations
One or more of the following system configurations shall be employed:
  1. 2-wire PV arrays with one functionally grounded conductor
  2. Bipolar PV arrays according to 690.7(C) with a functional ground reference (center tap)
  3. PV arrays not isolated from the grounded inverter output circuit
  4. Ungrounded PV arrays
  5. Solidly grounded PV arrays as permitted in 690.41(B)
  6. PV systems that use other methods that accomplish equivalent system protection in accordance with 250.4(A) with equipment listed and identified for the use
(B) Ground-Fault Protection
PV system dc circuits that exceed 30 volts or 8 amperes shall be provided with dc ground-fault protection meeting the requirements of 690.41(B)(1) and (B)(2) to reduce fire hazards.
Solidly grounded PV source circuits with not more than two modules in parallel and not on or in buildings shall be permitted without ground-fault protection.
Informational Note: Not all inverters, charge controllers, or dc-to-dc converters include ground-fault protection. Equipment that does not have ground-fault protection often includes the following statement in the manual: "Warning: This unit is not provided with a GFDI device."
(1) Ground-Fault Detection
The ground-fault protection device or system shall detect ground fault(s) in the PV system dc circuit conductors, including any functional grounded conductors, and be listed for providing PV ground-fault protection. For dc-to-dc converters not listed as providing ground-fault protection, where required, listed ground fault protection equipment identified for the combination of the dc-to-dc converter and ground-fault protection device shall be installed to protect the circuit.
Informational Note: Some dc-to-dc converters without integral ground-fault protection on their input (source) side can prevent other ground-fault protection equipment from properly functioning on portions of PV system dc circuits.
(2) Faulted Circuits
The faulted circuits shall be controlled by one of the following methods:
  1. The current-carrying conductors of the faulted circuit shall be automatically disconnected.
  2. The device providing ground-fault protection fed by the faulted circuit shall automatically cease to supply power to output circuits and interrupt the faulted PV system dc circuits from the ground reference in a functionally grounded system.
(3) Indication of Faults
Ground-fault protection equipment shall provide indication of ground faults at a readily accessible location.
Informational Note: Examples of indication include, but are not limited to. the following: remote indicator light, display, monitor, signal to a monitored alarm system, or receipt of notification by web-based services.

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