What is the term for the NEC rule allowing an over-current device to be located 25 feet after a change in cable size?

The term that describes the rule allowing an over-current device to be located 25 feet after a change in cable size is the 25 Foot Tap Rule. This rule is significant in the National Electrical Code (NEC) as it outlines specific scenarios where larger conductors can be tapped into smaller conductors, provided certain conditions are met.

The rationale behind this rule is to maintain safety and functionality in electrical installations. By permitting the installation of an over-current device within 25 feet of a conductor change in size, it acknowledges that short runs of cable, when properly sized and protected, can help ensure the effective and efficient operation of electrical systems.

This regulatory flexibility is essential for electrical design, as it allows for more practical arrangements while still enforcing necessary safety measures to prevent overcurrents and potential overloads in the system.

Other options do not accurately reflect this specific NEC guideline, which is why they are less suitable.