Bonding prevents a host of possible risks and dangers. “Imagine: the insulation on a PV source circuit wire becomes damaged, and the current-carrying part of the conductor makes contact with a frame or rail,” said Brian Mehalic, PV Curriculum Developer and Instructor at Solar Energy International.
Excluding modules, the majority of components in PV systems are bonded like any other electrical system. For example, grounding busbars are connected to the metal chassis of enclosures, such as disconnect switches, combiner boxes and inverters, and then an equipment grounding conductor (EGC) is connected to the busbar, Mehalic explained.
“Bonding and grounding PV systems ensures public safety, as well as the safety of PV installers and field electricians,” said Andy Zwit, Codes and Standards Manager at ILSCO. Excluding modules, the majority of components in PV systems are bonded like any other electrical system.
This oxide layer was electrically insulative and compromised the conductive integrity of the module/lug connection. Lugs and wire can still be used for bonding PV modules, but the lugs are now required to be listed for the application, per 690.43 (A).
That being said, PV equipment needs to be properly bonded so that the low current flows on metal parts can open smaller string level overcurrent devices, if installed, and also facilitate the operation of dc ground-fault protective devices. Figure 1. Location of Grounding Conductors in a Grounded PV System
A number of factors make the grounding and bonding of a PV system difficult. PV systems are exposed to the elements, which can result in atypical situations where the usual practices for bonding may not perform as intended.
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