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1. 隔爆型電氣設備

 具有能承受內部爆炸性氣體混合物的爆炸壓力，并阻止內部的爆炸向外殼周圍爆炸性混合物傳播的外殼電氣設備，標志為“d"。

2. 增安型電氣設備

 在正常運行條件下不會產生電弧、火花或可能點燃爆炸性混合物的高溫，結構上采取措施提高安全裕度，以避免在正常和認可的過

 載條件下出現電弧、火花或高溫電氣設備，其標志為“e"。

3. 粉塵防爆電氣設備

 按規定條件設計制造，使其外殼能阻可燃粉塵進入或進入量不會防礙設備安全運行，內部堆積的粉塵也不易的產生點燃，從而保證

 使用時不會引起周圍爆炸性混合物的爆炸的電氣設備。

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's without electric arc spark and high temperature up to ignite mixturer, it's structure adopts, safety step to avoid

 appearing electric, spark and high temperature, mark "e".

3. Powder&dust electric equipment

 On 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：

1. 粉塵防爆電氣設備的溫度組別與氣體防爆電氣設備的組別劃分相同。

2. 粉塵防爆電氣設備根據美標和歐標的差異分為A、B兩種型式。A、B兩種采用的試驗方法不同，但保護的等級是等同的。

Note:

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.