Quick Answer
NEC compliance for ground-mounted solar systems requires careful planning and consideration of the National Electric Code (NEC) requirements, particularly for rapid shutdown (RSD) systems.
Understanding NEC 690.12 for Ground-Mounted Systems
Ground-mounted solar systems must comply with NEC 690.12, which addresses rapid shutdown requirements for systems over 80 VDC. This involves installing a rapid shutdown device (RSD) that can reduce the system voltage to 30 VDC or less within 10 seconds when a shutdown signal is detected. The RSD must be connected to the DC disconnect switch and be accessible from the ground.
RSD Installation Techniques and NEC Requirements
When installing a RSD, it’s essential to follow the manufacturer’s instructions and ensure that the device is properly sized for the system. NEC 690.12 requires the RSD to be installed in a location that is accessible from the ground, typically within 10 feet of the DC disconnect switch. The RSD should also be installed in an enclosure that is rated for the environment and protects the device from the elements.
Example Application for Ground-Mounted Systems
For a ground-mounted solar system with a DC voltage of 400 VDC, a RSD with a maximum output current of 60 A is required to meet NEC 690.12 requirements. The RSD should be installed in a location that is accessible from the ground and within 10 feet of the DC disconnect switch. Additionally, the RSD should be sized to handle the system’s maximum DC current, which in this case would be 60 A.
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