Explosion-Proof Classification
| Область застосування | Класифікація газів | Типовий газ | Мінімальна енергія іскри запалювання |
|---|---|---|---|
| Під шахтою | I | Метан | 0,280 мДж |
| Заводи за межами шахти | IIA | Пропан | 0,180 мДж |
| IIB | Етилен | 0,060 мДж | |
| IIC | Водень | 0,019 мДж |
Перший клас: Electrical equipment designated for use in underground coal mines;
Другий клас: Electrical equipment intended for use in explosive gas environments, excluding coal mines and underground settings;
Class II is subdivided into IIA, IIB, and IIC. Devices labeled as IIB are suitable for environments where IIA devices are used; IIC devices can be utilized in conditions appropriate for both IIA and IIB equipment.
Distinctions between ExdIICT4 and ExdIIBT4
They cater to different groups of gases.
Ethylene is the typical gas associated with BT4.
Hydrogen and acetylene are the typical gases for CT4.
Products rated CT4 surpass those rated BT4 in specifications, as CT4 devices can be utilized in environments suitable for BT4, whereas BT4 devices are not applicable in environments appropriate for CT4.
