What is a requirement for outdoor boxes under the NEC?

Outdoor electrical boxes must be securely mounted to resist moisture, which is critical for ensuring safety and functionality in electrical installations. The National Electrical Code emphasizes the importance of protecting electrical equipment from environmental factors, particularly in outdoor locations where exposure to water and adverse weather conditions can occur. A securely mounted outdoor box helps to create a proper seal and prevents moisture ingress, thereby reducing the risk of electrical failures, short circuits, or hazardous situations.

Furthermore, the materials used for outdoor boxes and their design must adhere to specific standards that account for weather resistance, requiring proper mounting techniques that consider wind load and other environmental stresses. By ensuring boxes are adequately secured, practitioners can help maintain the integrity of electrical systems installed in outdoor settings.