What is the minimum height above finished grade for receptacles located outside?

The minimum height for receptacles located outside is established to ensure safety and functionality, particularly in relation to weather exposure. Placing these receptacles at least 18 inches above finished grade helps prevent water intrusion, which can lead to electrical shock hazards or damage to the equipment. This height is particularly important in areas where snow, rain, or flooding is a possibility, as it helps keep the receptacle above the risk of contact with water.

While lower heights may seem convenient for accessibility, they increase the risk of hazardous situations. The 18-inch minimum ensures that receptacles are still accessible for use while minimizing potential electrical dangers stemming from inclement weather or standing water. This guideline is consistent with the National Electrical Code (NEC) requirements regarding outdoor receptacle installations.