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ASTTBC RFPT — Emergency Lighting (EM) · Question

Under CAN/ULC-S572, photoluminescent exit signs must be tested for visibility by ensuring they are exposed to a specific minimum illumination level. What is this standard charging light level?

CAN/ULC-S572 specifies that photoluminescent signs must be charged with a minimum of 54 lux (5 foot-candles) of illumination at all times the building is occupi

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Question: Under CAN/ULC-S572, photoluminescent exit signs must be tested for visibility by ensuring they are exposed to a specific minimum illumination level. What is this standard charging light level?

Answer options:

  • 22 lux (2 foot-candles) ✅ 54 lux (5 foot-candles)
  • 108 lux (10 foot-candles)
  • 215 lux (20 foot-candles)

Correct answer: 54 lux (5 foot-candles)

Explanation: CAN/ULC-S572 specifies that photoluminescent signs must be charged with a minimum of 54 lux (5 foot-candles) of illumination at all times the building is occupied to ensure the required luminance duration in an emergency.

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