Mating connectors for PV equipment shall be polarized and have a configuration that is noninterchangeable with receptacles in other electrical systems on the premises.

• A. noninterchangeable
• B. compatible
• C. consistent
• D. interchangeable

Answer: (A)

The safety principle here is preventing cross-connection between PV equipment and other building electrical systems. Mating connectors for PV must be polarized and noninterchangeable so they cannot fit receptacles from other systems on the premises. This stops accidental miswiring, backfeeding, or energizing non-PV circuits, which could create shock or fire hazards. If a connector were compatible or interchangeable with other systems, it could be plugged into the wrong receptacle, posing a real safety risk. Noninterchangeable conveys the necessary protection more clearly than the other terms.