A listed relay must be located within how many feet of the controlled circuit appliance?

A listed relay must be located within how many feet of the controlled circuit appliance?

• A. 1 foot
• B. 5 feet
• C. 7 feet
• D. 3 feet

Answer: (D)

The key idea is proximity of the control relay to the device it will operate. Keeping a listed relay within a short distance of the controlled circuit appliance helps ensure reliable operation by minimizing control-wiring length, reducing voltage drop and potential interference, and speeding up the relay’s response when the circuit is actuated. The correct distance reflects the maximum allowed by the standard: not more than three feet away. So three feet is the distance the test is asking about. Distances longer than three feet would not meet the requirement, while anything within three feet is acceptable.

The key idea is proximity of the control relay to the device it will operate. Keeping a listed relay within a short distance of the controlled circuit appliance helps ensure reliable operation by minimizing control-wiring length, reducing voltage drop and potential interference, and speeding up the relay’s response when the circuit is actuated.

The correct distance reflects the maximum allowed by the standard: not more than three feet away. So three feet is the distance the test is asking about. Distances longer than three feet would not meet the requirement, while anything within three feet is acceptable.