How should cables installed under metal-corrugated sheet roof decking be positioned in relation to the lowest part of the roof?

Cables installed under metal-corrugated sheet roof decking should be positioned at least 1.5 inches above the lowest part of the roof. This requirement is in place to ensure that the cables are adequately safeguarded from potential hazards such as moisture, debris, or physical damage that can occur from environmental exposure.

By maintaining this clearance, a buffer is created that minimizes the risk of water accumulation or condensation that could lead to short circuits or other electrical failures. Furthermore, this height helps to ensure compliance with electrical codes that dictate safe installation practices to protect both the integrity of the electrical system and the safety of the surrounding environment.

It's important to adhere to these established clearances to meet safety standards and regulatory requirements within electrical installations, which ultimately contributes to the longevity and reliability of the system.