Provided emergency lighting must put out at least a 0.1 foot-candle, and on average should provide a 1 foot-candle.Emergency lighting must be provided for at least 90 minutes if the building lighting fails.This permits photoluminescent, externally illuminated, or internally illuminated sources of lighting. Every sign must be suitably illuminated by a reliable source of light.It sets out the following general standards: The National Fire Protection Association (NFPA) dictates the standards for the illumination of self-powered exit signs in the USA in the Life Safety Code. This helps maintain illumination if the building loses power and can help buildings remain compliant with regulations. What would happen if, during an emergency, the exit signs became invisible?Īlthough electric exit signs exist, it is usually a better option for exit signs to be self-powered. Exit signs are intended to guide people to safety in an emergency.
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