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This technique is often used for motors and fluorescent fixtures that have no arcing or sparking parts., this type of protection may be used in enclosures that have only terminals but no switches or relays. Hubs and connectors of the type shown on the enclosures here may be used because the enclosures use increased safety for the terminations (with flameproof switches inside) so the enclosures and fittings do not have to vent flames or hot gases.
This type of protection, along with flameproof and intrinsically safe equipment, are the most commonly used methods in Zone 1 areas.
This protection technique shall be permitted for equipment in Class I, Zone 1 or Zone 2 locations.
© Hughes Associates,Inc. 2012