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![]() May I apply the handrail marking in my emergency staircases on the wall behind the handrail?Ī: No. You find a list of OSHA approved NRTLs at OSHA, Occupational Safety and Health Administration has recognized certain testing facilities that provide product safety testing and certification services to manufacturers, e.g., in compliance with photoluminescence-related standards such as UL924 for code-compliant EXIT signs and UL1994 for code-compliant Egress Path Marking Systems. NRTL stands for Nationally Recognized Testing Laboratory.
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