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Basic explosion-proof knowledge
The relationship among the temperature group, surface temperature, and ignite temperature
Temperature group
Max surface temp.
Ignite temp.for gas or vapor
T1
450℃
＞450℃
T2
300℃
＞300℃
T3
200℃
＞200℃
T4
135℃
＞135℃
T5
100℃
＞100℃
T6
85℃
＞85℃
Max surface temperature for electric equipment is max surface temperature for explosion -proof electric equipment under the environment of blast gas, and the temperature should lower than ignite temperature for the gas and vapor of this dangerous area.
The ignite temperature is the gas or steam’s burning temperature under the environment of blast gas, which is the character of the gas and vapor.
3、Classification of gas and vapor/permmitted apparatus classitication/relationship
Classification of gas and vapor
Permmitted apparatus classitication/Relationship
ⅡA（For example:Propane, Pentane, Benzene, gasoline, Ethanol, Aldehyde, Acetone. methylamine） ⅡA、ⅡB or ⅡC
ⅡB（For example:Ethene, climethyl ether, coke oven gas,
 ⅡA、ⅡB
ⅡC（For example:Hydrogen, Acetylene, and carbon bisulphide） ⅡC
Using criterion：
GB3836.1-2000（Means IEC60079-0:1998）:《Electrical apparatus for explosive atmospheres-Part 1: General requirements》
GB3836.2-2000（Means IEC60079-1:1990）:《Electrical apparatus for explosive atmospheres-Part 1：Flame-proof“d”》
GB3836.3-2000（Means IEC60079-7:1990）:《Electrical apparatus for explosive atmospheres-Part 3:Increased safety“e”》
GB3836.4-2000（Means IEC60079-11:1990）:《Electrical apparatus for explosive atmospheres-Part4：Intrinsic safety“i”》
GB3836.13-2000（Means IEC60079-13:1990）:《Electrical apparatus for explosive atmospheres-Part13：Repairing the electric equipment for explosive gas atmosphere》
GB3836.14-2000（Means IEC60079-10:1990）:《Electrical apparatus for explosive atmospheres-Part14：Dangerous area classification 》
GB3836.15-2000（Means IEC60079-14:1990）:《Electrical apparatus for explosive atmospheres-Part15：Electric fixing at the dangerous area （Except coal mine）》
GB50058-92《Design criterion for electric equipment at explosive and fire area 》

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