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Grounding



System Grounding. For a photovoltaic power source, one conductor of a two-wire system with a photovoltaic system voltage over 50 volts and the reference (center tap) conductor of a bipolar system shall be solidly grounde3d or shall use other methods that accomplish equivalent system protection in accordance with 250.4(A) and that utilize equipment listed and identified for the use.
Exception: Systems complying with 690.35.

Point of System Grounding Connection. The dc circuit grounding connection shall be made at any single point on the photovoltaic output circuit.

Equipment Grounding. Exposed non-current carrying metal parts of module frames, equipment, and conductors enclosures shall be grounded in accordance with 250.134 or 250.136(A) regardless of voltage.

Size of Equipment Grounding Conductor. Where not protected by the ground-fault protection equipment required by 690.5, the equipment-grounding conductor for photovoltaic source and photovoltaic output circuits shall be sized for 125 percent of the photovoltaic-originated short-circuit currents in that circuit. Where protected by the ground-fault protection equipment required by 690.5, the equipment-ground conductors for photovoltaic source and photovoltaic output circuits shall be sized in accordance with 250.122.

Grounding Electrode System.


Alternating-Current Systems. If installing an ac system, a grounding electrode system shall be provided in accordance with 250.50 through 250.60. The grounding electrode conductor shall be installed in accordance with 250.64.

Direct-Current Systems. If installing a dc system, a grounding electrode system shall be provided in accordance with 250.166 for grounded systems or 250.169 for ungrounded systems. The grounding electrode conductor shall be installed in accordance with 250.64.
,br> Systems with Alternating-Current and Direct-Current Grounding Requirements. Photovoltaic power systems with both alternating-current and direct-current (dc)grounding requirements shall be permitted to be grounded as described bellow:
  1. A grounding-electrode conductor shall be connected between the identified dc grounding point to a separate dc grounding electrode. The dc grounding-electrode to make a grounding electrode system according to 250.52 and 250.53. The bonding conductor shall be no smaller than the largest grounding electrode conductor, either ac or dc.

  2. The dc grounding electrode conductor and ac grounding electrode conductor shall be connected to a single grounding electrode. The separate grounding electrode conductors shall be sized as required by 250.66 (ac) and 250.166 (dc).



Continuity of Equipment Grounding Systems. Where the removal of equipment disconnects the bonding connection between the grounding electrode conductor and exposed conducting surfaces in the photovoltaic source or output circuit equipment, a bonding jumper shall be installed while the equipment is removed.

Continuity of Photovoltaic Source and Output Circuit Grounded Conductors. Where the removal of the utility-interactive inverter or other equipment disconnects the bonding connection between the grounding electrode conductor and the photovoltaic source and/or photovoltaic output circuit grounded conductor, a bonding jumper shall be installed to maintain the system grounding while the inverter or other equipment is removed.



North American Electrical Code Introduction
PV Systems - General Information 690.1 - 690.3
PV Systems - General Information (1 of 2) 690.1 - 690.3
PV Systems - General Information (2 of 2) 690.1 - 690.3
PV Systems - Circuit Requirements 690.7
PV Systems - Circuit Sizing and Current 690.8
PV Systems - Overcurrent Protection 690.9
PV Systems - Stand-Alone Systems 690.10
PV Systems - Disconnecting Means 690.13 - 690.18
PV Systems - Wiring Methods 690.31 - 690.35
PV Systems - Grounding 690.41 - 690.49
PV Systems - Marking 690.51 - 690.56
PV Systems - Connections to Other Sources 690.60 - 690.64
PV Systems - Storage Batteries 690.71 - 690.74
PV Systems - Systems Over 600 Volts 690.80 - 690.85
Storage Batteries - General 480.1 - 480.4
Storage Batteries - Installation 480.8 - 480.10
 

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