Firstly, all three devices are designed for dust explosion protection and fall under the category of secondary explosion-proof equipment. The explosion-proof ratings are as follows: AT < BT < CT.
| תחום השימוש | סיווג גזים | גז מייצג | אנרגיה מינימלית של ניצוץ ההצתה |
|---|---|---|---|
| מתחת למכרה | I | מתאן | 0.280 mJ |
| מפעלים מחוץ למכרה | IIA | פרופאן | 0.180 mJ |
| IIB | אתילן | 0.060 mJ | |
| IIC | מימן | 0.019 mJ |
CT devices feature a superior dust-proof rating and may be utilized in areas designated for AT and BT. However, AT and BT devices are not suitable for areas that require CT standards.
In other words, CT devices can substitute for AT and BT, but AT and BT devices cannot substitute for CT.
