Quick Answer
A solar DC disconnect should meet UL 1741 and UL 508A certifications, as well as be listed to the relevant national electrical codes, such as NEC 690.13 and 705.12, to ensure safe and reliable operation.
UL Certification Requirements
A solar DC disconnect must meet the UL 1741 standard for photovoltaic (PV) inverters, as well as the UL 508A standard for industrial control equipment. This ensures that the disconnect meets requirements for overcurrent protection, short-circuit protection, and other safety features. The disconnect must also be listed to the relevant national electrical codes, such as NEC 690.13 for PV systems and NEC 705.12 for grid-interconnected systems.
NEC Code Compliance
The National Electrical Code (NEC) requires that a solar DC disconnect be installed in a location that is accessible to the user, such as outside the building or in a readily accessible location within the building. The disconnect must also be rated for the maximum DC voltage and current of the PV system, which is typically 600V or less. In addition, the NEC requires that the disconnect be equipped with arc-fault protection, which is designed to prevent electrical arcs that can cause fires.
Labeling and Marking Requirements
A solar DC disconnect must be properly labeled and marked to indicate its purpose and operation. The label must include the manufacturer’s name, model number, and voltage and current ratings. The disconnect must also be marked with a warning label indicating that it is a DC voltage disconnect and should not be used for AC systems. Proper labeling and marking are critical to ensure that users understand the safe operation and use of the disconnect.
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