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.
| Naudojimo sritis | Dujų klasifikacija | Tipinis dujų mišinys | Mažiausia uždegimo kibirkšties energija |
|---|---|---|---|
| Po kasykla | I | Metanas | 0,280 mJ |
| Gamyklos už kasyklos ribų | IIA | Propanas | 0,180 mJ |
| IIB | Etilenas | 0,060 mJ | |
| IIC | Vandenilis | 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.
