1、Isolation explosive electric equipment
Withstanding for explosion pressure from interior mixed air also avoiding it spread out to exterior mixed air, mark“d”.
2、Increasing safety electric equipment
In normal condition, it withoutelectric arc spark and high temperature up to ignite mixturer, it structure adopts, safety step to avoid appearing electric, spark and high temperature, mark“e”
3、Powder&dust electric equipmentOn stated condition the enclosure can prevent dust entering or the interior dust will not ignite mixed air, so that ensure the surrounded explosive mixed air will not be ignited.
注: Note:
1、粉尘防爆电气设备的温度组别与气体防爆电气设备的组别划分相同。
2、粉尘防爆电气设备根据美标和欧标的差异，为分A、B两种型式。A、B两种采用的试验方法不同，但保护的等级是等同的。
1、Dust explosive electric equipment and air explosive electric equipment temperature classes is the same.
2、According to America and europe standard difference. There are two kinds, the test ways of A and B is different, but protective class is the same.
温度组别 Temperature class
温度组别
气体引燃温度
设备允许最高表面温度
T6
85＜T≤100
85
T5
100＜T≤135
100
T4
135＜T≤200
135
T3
200＜T≤300
200
T2
300＜T≤450
300
T1
450＜T
450
防爆标志举例 Explosive mark exemplify
1、如电气设备为ⅡB类隔爆型T3组，标志为Exd Ⅱ BT3。
2、如电气设备为Ⅱ类增安型，温度组别为T2组，标志为ExeⅡT2。
3、如电气设备采用一种以上的复合型式，则先标出主体防爆型式，后标出其它防爆型式，如主体采用增安型内装ⅡC类隔
爆部件，温度组别为T4，标志为ExedⅡCT4。如果主要部件采用隔爆型ⅡB类，T4组，其余部件为增安型，则防爆标
志为ExedⅡCT4。
4、DIPA20 TA T4，DIP表示粉尘防爆，A20表示可使用于20区的A型设备，TAT4表示设备的温度组别为T4(135℃)。
1、Class ⅡB, group T3 isolation explosive electric equipment, mark“ExdⅡBT3”.
2、Class Ⅱ, group T2 increasing safety explosive electric equipment, mark“ExeⅡT2”.
3、It adopts multiple type, First mark main explosive proof type. Then mark other explosive-proof type. The main body adopt increasing
safety and built-in classⅡC isolative explosion parts, temperature T4, mark“EexdⅡCT4”,if main part adopts isolative explosive
ⅡB T4, other adopt increasing safety, then it marks“ExdeⅡBT4”.
4、DIPA20TA, T4, DIP means dustignition explosion-proof A20
means type A explosive-proof equipment and used for Zone 20, TA T4 means temperature T4 (135℃).
