Photovoltaic array support grounding requirements

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The typical electrical system of solar power plants consists of several PV panels forming an array size of capacity 1-2 MVA that are connected to a common DC collection point which is then inverted to low-voltage AC to be transformed via

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About Photovoltaic array support grounding requirements

Section 690.41 covers system grounding, allowing both grounded and ungrounded PV array conductors. Both types of systems require ground-fault detection on the PV source and output circuit conductors [690.5 and 690.35(C)] with one very restrictive exception. The only PV system that would not require ground-fault.

Equipment grounding requirements for PV systems are covered in 690.43. These requirements include the bonding and grounding requirements.

Sections 690.45 and 690.46 cover the sizing and protection of EGCs within a PV array. Since nearly all PV systems are required to have ground-fault protection, 690.45 references 250.122 for the minimum sizing of the.

The last issue related to grounding electrode systems in the 2014 NECis Section 690.47(D), Additional Auxiliary Electrodes for Array.

Section 690.47 covers the requirements for grounding electrode systems in PV systems. This section has seen many changes over the 30 years that Article 690 has been in the NEC (yes, Article 690 was introduced in the 1984.

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6 FAQs about [Photovoltaic array support grounding requirements]

What are the grounding requirements for PV array equipment?

This connection shall be in addition to any other equipment grounding conductor requirements in 690.43 (C). The PV array equipment grounding conductors shall be sized in accordance with 690.45. For specific PV system grounding configurations permitted in 690.41 (A), one of the following conditions shall apply:

What are the bonding and grounding requirements for PV systems?

The specific bonding and grounding requirements for PV systems in Article 690 are in Part V. Section 690.41 covers system grounding, allowing both grounded and ungrounded PV array conductors.

Does a PV array need a grounding conductor?

Since the PV array and other electrical equipment in PV system, e.g., inverters, are often located remotely from one another, 690.43 (B) requires that an equipment grounding conductor (EGC) be run from the array to other associated equipment.

Do I need a grounding electrode for a PV array?

While a separate grounding electrode system is still permitted to be installed for a PV array, per 690.47 (B), it is no longer required to be bonded to the premises grounding electrode system. In PV systems with string inverters, the equipment grounding conductor from the array terminates to the inverter’s grounding bus bar.

Do PV modules need a grounding conductor?

Metal parts of PV module frames, PV equipment, and enclosures containing PV system ac and dc conductors must be connected to the circuit equipment grounding conductor per 690.43 (A) through (D). (A) Photovoltaic Module Mounting Systems and Devices.

Do PV systems need equipment grounding?

Regardless of system voltage, equipment grounding is required on all PV systems. Appropriate bonding and equipment grounding limits the voltage imposed on a system by lightning, line surges and unintentional contact with higher-voltage lines.