What is the minimum output duration required for light sources used in field testing arc-flash detection relays?

The minimum output duration required for light sources used in field testing arc-flash detection relays is 1 ms. This duration is important because the arc-flash detection relays need a specific time frame to accurately detect the light produced during an arc flash event. A period of 1 ms is adequate for the relay to react and perform necessary actions, such as tripping the circuit to prevent further damage and enhance safety.

Shorter durations may not be sufficient for the relay's sensors to register the event accurately, while longer durations would exceed the necessary response requirements and could delay action in a situation where immediate response is critical. Thus, the choice of 1 ms strikes an ideal balance that meets the technical specifications for effective arc-flash detection while ensuring optimal safety measures are in place.