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.
| Lietošanas joma | Gāzes klasifikācija | Tipiska gāze | Minimālā aizdedzes dzirksteles enerģija |
|---|---|---|---|
| Zem raktuves | I | Metāns | 0,280 mJ |
| Rūpnīcas ārpus raktuves | IIA | Propāns | 0,180 mJ |
| IIB | Etilēns | 0,060 mJ | |
| IIC | Ūdeņradis | 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.
