Which principle ensures emergency lighting remains functional during a power outage?

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Multiple Choice

Which principle ensures emergency lighting remains functional during a power outage?

Explanation:
Emergency lighting must stay lit when the building loses power, so it relies on an independent power source dedicated to the emergency system. This means lights have their own backup energy—such as rechargeable batteries or a separate standby power supply—that automatically takes over when the normal electrical supply fails. With this independence, the lighting can illuminate egress routes even during an outage. Tying emergency lighting to the building’s main power would leave it dark once power is out, and relying on solar alone isn’t dependable indoors or under all conditions. Battery-backed or otherwise independent backups ensure the lights function whenever they’re needed for safe evacuation.

Emergency lighting must stay lit when the building loses power, so it relies on an independent power source dedicated to the emergency system. This means lights have their own backup energy—such as rechargeable batteries or a separate standby power supply—that automatically takes over when the normal electrical supply fails. With this independence, the lighting can illuminate egress routes even during an outage. Tying emergency lighting to the building’s main power would leave it dark once power is out, and relying on solar alone isn’t dependable indoors or under all conditions. Battery-backed or otherwise independent backups ensure the lights function whenever they’re needed for safe evacuation.

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