About Thin-film photovoltaic panel grounding wire requirements
Always use #6 AWG bare copper wire for outdoor grounding to meet National Electric Code requirements and pass inspections.
Always use #6 AWG bare copper wire for outdoor grounding to meet National Electric Code requirements and pass inspections.
Address two key issues: There are a limited numbers of approved (listed) grounding methods, despite a wide variety of installation methods for grounding module frames. Lack of confidence in existing approved grounding methods, due largely to failures in the field from loss of mechanical integrity, installation error, and damage from corrosion.
The UL 1703 standard does allow for PV modules and panels to be grounded with listed grounding devices. Until recently, grounding devices could be certified to a few standards which included UL 1703; UL 467, Grounding and Bonding Equipment; and, subject UL 2703, Mounting Systems, Mounting Devices, Clamping/Retention Devices, and Ground Lugs for .
The NEC is the primary guiding document for the safe designing and installation practices of solar PV systems in the residential and commercial markets in the United States. The summary outlined below can be used by a solar PV practitioner; however, it is highly recommended that section 690.41, 690.42, 690.43, 690.45 and 690.47 always be read .
The equipment in direct current (DC) portions of the PV system may be grounded using conductors as outlined above with appropriate connections to each metal surface. In general, when a copper wire is connected to a metal surface to be grounded, some sort of certified/listed grounding device must be used.
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6 FAQs about [Thin-film photovoltaic panel grounding wire requirements]
What are equipment grounding requirements for PV systems?
Equipment grounding requirements for PV systems are covered in 690.43. These requirements include the bonding and grounding requirements for exposed metal parts of PV systems such as metallic module frames, electrical equipment, and conductor enclosures [690.43 (A)].
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 ungrounded PV systems need ground protection?
In all cases, an ungrounded array must be provided with equivalent protection for ground faults, as required by NEC 690.35. A PV system is defined as a grounded system when one of the DC conductors (either positive or negative) is connected to the grounding system, which in turn is connected to the earth.
Does a photovoltaic system have a DC grounding system?
Photovoltaic systems having dc circuits and ac circuits with no direct connection between the dc grounded conductor and ac grounded conductor shall have a dc grounding system. The dc grounding system shall be bonded to the ac grounding system by one of the methods in (1), (2), or (3).
Where should a grounded PV system conductor be grounded?
The location where grounded PV system conductors must be grounded is covered in 690.42. It states that a grounded PV array must be grounded at the ground-fault protection device—and at no other location.
Why is proper grounding of a photovoltaic power system important?
Proper grounding of a photovoltaic (PV) power system is critical to ensuring the safety of the public during the installation’s decades-long life. Although all components of a PV system may not be fully functional for this period of time, the basic PV module can produce potentially dangerous currents and voltages for the life of the system.