Quick Answer
To ensure proper DC disconnect compliance, a qualified electrician must document the installation, including a load calculation, circuit diagram, and certification of the disconnect device.
Required Documentation
To comply with the National Electric Code (NEC) and ensure safe installation, a qualified electrician must document the DC disconnect installation. This documentation includes a load calculation to determine the correct size of the disconnect device and the main electrical panel. The load calculation should take into account the maximum inverter output, battery bank capacity, and any other electrical loads connected to the DC system. The document should also include a circuit diagram showing the DC disconnect location, size, and rating.
Certification of DC Disconnect Device
The DC disconnect device must be certified by a recognized testing laboratory, such as UL (Underwriters Laboratories) or ETL (Intertek). The certification label should be attached to the disconnect device and include the device’s rating, such as amperage and voltage. The certified document should also include the device’s compliance with relevant NEC standards, such as NEC 690.
Record Keeping and Inspection
After installation, the DC disconnect installation should be inspected and certified by a qualified electrician. The inspection should include verification of the load calculation, circuit diagram, and certification of the disconnect device. The qualified electrician should keep a record of the inspection, including photos and documentation of the DC disconnect installation. This record should be kept on file and available for future reference or inspection.
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