Quick Answer
Equipment bonding is required for solar installations in areas with high levels of lightning strikes or other electrical hazards, typically when the system voltage exceeds 30 volts. This requirement helps prevent electrical shock and reduces the risk of fire.
Understanding the NEC Guidelines
The National Electric Code (NEC) sets specific guidelines for solar installation safety. According to the NEC 690.5(A)(1), a bonding jumper is required for ground-fault protection in PV systems with a DC voltage of 30 volts or higher. This bonding jumper connects the grounding electrode system to the service equipment, ensuring a path to ground for fault currents and reducing the risk of electrical shock.
Calculating Bonding Requirements
To determine if equipment bonding is required, you need to calculate the DC voltage of the solar system. For a 48V system, for example, the DC voltage is 48 volts, which meets the NEC requirement. However, for a 12V system, the DC voltage is below the 30V threshold, and bonding may not be necessary. It’s essential to consult the NEC guidelines and local regulations to determine specific bonding requirements for your solar installation.
Best Practices for Equipment Bonding
When performing equipment bonding for solar installations, ensure that the bonding jumper is sized according to the NEC guidelines. A 10-gauge or smaller copper conductor is typically required for bonding jumpers in PV systems. It’s also crucial to ensure that the grounding electrode system is properly connected to the service equipment and that all equipment is securely attached to the grounding system.
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