UL-1995 requires while ASHRAE recommends that all HVAC access points (doors/panels) be secured with a safety interlock switch that automatically de-energizes the UV-C system when opened. The switch is a ‘normal open’ circuit that is depressed when the door is closed, energizing the UV-C system. When any access door is opened, the safety switch “breaks” the circuit, turning off all UV-C fixturing.
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