The term ampacity describes the conductor's ability to carry current.

• A. Voltage rating
• B. Dielectric strength
• C. Current carrying capacity
• D. Conductor resistance

Answer: (C)

Ampacity is about how much current a conductor can carry safely over a period of time. It reflects the heating that results from electrical current and the ability of the conductor’s insulation and surroundings to dissipate that heat without exceeding temperature limits. So ampacity is best described as the current carrying capacity.

This isn’t about voltage rating—the maximum voltage the insulation can withstand. It isn’t about dielectric strength—the insulation’s resistance to electrical breakdown. And it isn’t about conductor resistance—the inherent opposition to current that causes some heating, but that resistance value alone doesn’t define how much current can be run continuously without overheating.