What is the #1 criteria for selecting cables?

The number one criterion for selecting cables is that they must safely conduct the current of the load. This is crucial because the cable's primary function is to carry electrical current without overheating or posing safety hazards. If a cable is not adequately rated to handle the current, it can lead to overheating, potential fire hazards, and failure of the electrical system.

Essentially, the current carrying capacity, often referred to as ampacity, is determined by factors like the cable's size, insulation type, and installation conditions. A cable that cannot safely conduct the required current will not only malfunction but could also compromise safety.

This critical aspect underscores the importance of ensuring that any selected cable is rated appropriately for the expected load to maintain safe and efficient operation in electrical systems.