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The biggest misconception is the “flame” originates from outside of the Flame-proof equipment, and the equipment is specially designated to prevent it from catching fire (or explode). It’s the other way round actually.
Ex “d” = Flame-proof, which means the housing will contain the flame without allowing the flame to escape out from the housing. *commonly and incorrectly known as Explosion-proof! Professional explanation:
“Lamps, circuits and sparking devices are contained within flameproof enclosure.
• Wiring enters enclosure via flameproof cable gland or flameproof barrier.
• Joints on covers or openings are protected by the ‘flamepath’.
• Does not prevent explosion occurring but contains the explosion and prevents ignition of surrounding atmosphere.”Example of Flame-proof lighting
Example of Flame-proof barrier
Example of Flamepath
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