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Photoluminescent Exit Sign ("PL")

Photoluminescent Exit Sign ("PL")

A Photoluminescent (PL) exit sign, also known as externally illuminated exit sign is a type of single-purpose exit sign and passive safety device used in buildings to indicate the path of travel to a required exit.

These signs rely on photoluminescent materials that absorb and store light energy from a continuous light source (minimum 100 lux at the sign face with a colour temperature of at least 4000 K). In the event of a power failure, they must emit stored energy in the form of light, maintaining a luminance of at least 30 mcd/m² for a minimum of 90 minutes.

Photoluminescent exit signs exit signs must comply with specific criteria outlined in Section 5 and Appendix D of AS/NZS 2293.1, as modified by Specification S25C of the National Construction Code (NCC).

Key requirements include:

  • Illumination Standards: Continuous charging by a dedicated light source and testing under ASTM E2073-10.
  • Pictorial Elements: Enlarged elements with photoluminescent borders for visibility.
  • Viewing Distance: A maximum allowable distance of 24 metres.

It is important to note that PL exit signs are a passive safety measure and differ from active, electrically illuminated exit signs required for compliance with AS/NZS 2293.1 and Part E4 of the NCC. They are not substitutes for emergency lighting systems and certain exit lighting systems but can complement them in appropriate settings.

    Disclaimer

    In preparing this definition, we have drawn from various sources including Legislation, Codes, Standards and industry information, research and knowledge.  Like the english language, these definitions may subtly change from time to time. As such these definitions are provided solely on the basis that users will be responsible for making their own assessment of the definition and and are advised to verify all relevant representations, statements and information.