Quick Answer
Yes, specific mounting heights are recommended for solar disconnects to ensure safe and reliable operation. The mounting height depends on the type of disconnect and its application. Typically, the disconnect should be mounted between 3 to 6 feet off the ground.
Recommended Mounting Heights
The National Electric Code (NEC) and other industry standards provide guidelines for mounting heights of solar disconnects. For example, according to the NEC, a disconnect for a 480-volt system should be mounted at least 7 feet 6 inches above grade, while a disconnect for a 600-volt system should be mounted at least 10 feet above grade.
Sizing Considerations
When sizing a solar disconnect, one must consider the total fault current that could flow through the system. This includes the short-circuit current of the solar array, the inverter, and any other equipment connected to the system. A disconnect rated for 1000 amps or more is typically required for systems with high short-circuit currents. The disconnect should be sized to handle the maximum fault current, taking into account any derating factors.
Safety Considerations
Proper installation and mounting of solar disconnects are critical for ensuring safe and reliable operation. In addition to following the recommended mounting heights, solar disconnects should be installed in a location where they are easily accessible for maintenance and operation. The disconnect should also be protected from the elements and physical damage.
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