National Electrical Code (NEC) Article 690 Practice Test

The maximum distance allowed between supports for single-conductor PV wire in outdoor cable trays is 12 inches. This requirement is established to ensure that the wires are adequately secured and do not sag or become damaged due to environmental factors or physical interference. Adequate support helps maintain the integrity of the wiring system, minimizes the risk of mechanical stress, and enhances electrical safety and performance.

The 12-inch support requirement is in line with best practices for securing electrical conductors, which help to mitigate issues related to sagging and potential damage from environmental conditions, such as wind or rain. By adhering to this standard distance, installers can ensure that the installation is compliant with the National Electrical Code, promoting safety and efficiency in solar energy applications.