About Requirements for grounding resistance of photovoltaic combiner box
The grounding resistance value should not exceed 4 ohms; otherwise, rectification of the grounding grid should be carried out to ensure lightning protection effectiveness.
The grounding resistance value should not exceed 4 ohms; otherwise, rectification of the grounding grid should be carried out to ensure lightning protection effectiveness.
Study Outline. Address gap in requirements and methods for reliable grounding of PV module frame and mounting components. Preliminary “lay‐of‐the‐land” Report (BEW) ‐ Published 3/2011. Summary of existing conditions, problem statement. Survey of existing issues and experiences from stakeholders.
b) Photovoltaic combiner box A photovoltaic combiner box is permitted to be installed on the roof and it is preferred to be as close as possible to the PV modules forming the array. The purpose of the combiner box is to group the wiring from the array into one cable run to other combiners or to the inverter, which reflects the logic of having .
The safety requirements related to bonding and grounding PV system equipment is experiencing dramatic improvements as products certified to UL 2703 become readily available. For the next year, products certified to UL 467 may be acceptable to AHJs provided the devices have been tested to verify use in aboveground, outdoor locations.
The connecting wires should be as short and straight as possible, with a cross-sectional area of not less than 16 square millimeters. The grounding resistance value should not exceed 4 ohms; otherwise, rectification of the grounding grid should be carried out to ensure lightning protection effectiveness.
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