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BS 7535 1992 Edition, August 15, 1992
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Electrical Apparatus Complying with BS 5501 or BS 6941 in the Presence of Combustible Dusts
Additional Comments: W/D NO S/S
Page Count:60
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Electrical apparatus intended for use in explosive gas atmospheres under conditions where the hazard will be from combustible dust. Electrical apparatus is considered acceptable if it operates safely in an enclosure with a maximum dust layer thickness of five millimetres on its external surface.