Basic Knowledge of Explosion-Proof Electrical Equipment in Explosion-Proof Electric Heaters

I. Selection of Explosion-Proof Electrical Equipment

1. Select the type of explosion-proof electrical equipment according to the zone category

	EN60079-15	NEC500	GB3836.15
Zone 0	ia Intrinsically safe electrical equipment and circuits
Zone 1	d, p, e, i, q, o, m	Flameproof, intrinsically safe capable of withstanding 2 faults, pressurized	d, p, e (limited to junction boxes, enclosures, single-pin fluorescent lamps, etc.) i, q, o, m
Zone 2	(1) Equipment for Zone 1 　(2) Type "n" 　(3) Equipment that does not produce sparks under normal operation	(1) Equipment for Zone 1 　(2) Type "n" 　(3) Equipment that does not produce sparks under normal operation	(1) Equipment for Zone 1 　(2) Type "n"
Note 1:	For special type equipment marked with "S", it should be selected according to the zone type indicated on the equipment, and special conditions for installation and use should be noted.
Note 2:	According to the actual situation in China, the "e" type equipment allowed for use in Zone 1 is limited to: a) Junction boxes and enclosures that do not produce sparks, arcs, or dangerous temperatures under normal operation, including electrical products with main body type "d" or "m" and wiring part type "e". b) "e" type low-voltage asynchronous motors (except those with frequent starting or harsh environmental conditions) equipped with suitable thermal protection devices (GB3836.4 Appendix D). c) Single-pin "e" type fluorescent lamps.

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