What is the minimum height above grade for equipment containing PV system DC circuits greater than 1,000V installed on the exterior of buildings?

The minimum height above grade for equipment containing photovoltaic (PV) system direct current (DC) circuits greater than 1,000 volts installed on the exterior of buildings is specified to be 10 feet. This requirement is aimed at ensuring safety by providing a clear space that helps prevent accidental contact with energized components.

The 10-foot height requirement serves to mitigate risks associated with the high voltage present in these systems, reducing the likelihood of accidental electrocution or contact by pedestrians, maintenance personnel, or anyone accessing the area around the installation.

This height is in alignment with the overarching safety and accessibility principles outlined in the National Electrical Code (NEC), particularly for high-voltage installations, as these systems can pose significant hazards. It reflects the need for established standards to protect both individuals and property in the vicinity of electrical systems.

The other height options do not meet the NEC’s safety standards for installations dealing with DC circuits above 1,000 volts.