Which term describes the continuous current-carrying capacity of a conductor under prescribed conditions?

• A. Ampacity
• B. The lesser
• C. The greater
• D. Neither A nor B

Answer: (A)

Ampacity is the maximum current a conductor can carry continuously under specific use conditions without the insulation or its temperature rating being exceeded. This takes into account factors like the conductor material and size, insulation type, ambient temperature, and how the conductors are installed (in air, in a conduit, underground, and how many conductors share a raceway). The idea is to ensure the conductor won’t overheat during ongoing, long-duration operation. The other terms shown aren’t standard descriptors for this concept, and choosing them wouldn’t reflect the actual rating used to size conductors for safe, continuous operation.