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520.47 Backstage Lamps (Bare Bulbs)
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Lamps (bare bulbs) installed in backstage and ancillary areas where they can come in contact with scenery shall be located and guarded so as to be free from physical damage and shall provide an air space of not less than 50 mm (2 in.) between such lamps and any combustible material.
Exception: Decorative lamps installed in scenery shall not be considered to be backstage lamps for the purpose of this section.
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