What is the purpose of electrical interlock switches on panel doors?

What is the purpose of electrical interlock switches on panel doors?

• A. To monitor temperature
• B. To interrupt local power for personal protection
• C. To indicate door open status
• D. To adjust voltage

Answer: (B)

Electrical interlock switches on panel doors are safety devices that cut power to the panel when the door is opened. The main purpose is to protect personnel by ensuring the equipment isn’t energized while someone could be exposed to live parts. When the door is opened, the interlock interrupts the local power circuit, so the equipment must be reset or closed to restore power. They aren’t intended for monitoring temperature, indicating door status, or adjusting voltage.

Electrical interlock switches on panel doors are safety devices that cut power to the panel when the door is opened. The main purpose is to protect personnel by ensuring the equipment isn’t energized while someone could be exposed to live parts. When the door is opened, the interlock interrupts the local power circuit, so the equipment must be reset or closed to restore power. They aren’t intended for monitoring temperature, indicating door status, or adjusting voltage.