How to understand the class Idivision2 of IECEx/ATEX explosion-proof certification?

Release time: 2023-02-03

Class 1 division 1 motors are used for long-term explosive gas in the working environment

Class 1 division 2 motors are used in working environments where explosive gases occasionally appear

The explosion-proof grade of the motor is classified according to the three categories of class, division and group. The specific division of the three categories is as follows:

1. Classification of explosive substances in the area, mainly to distinguish explosive substances in the environment
Class I (Class I)	Flammable gas, vaporized or liquid substance
Class II	Combustible dust
Class III (Class III)	Combustible fibers or flying objects

2. The classification of hazardous areas is mainly divided into the following two categories according to the frequency and duration of hazardous substances in explosive environments:
North American General Explosive Atmospheres (UL/cUL)
Division 1	Continuous or frequent presence of flammable or explosive substances in normal environments
Division 2	A flammable or explosive substance is extremely unlikely to exist under normal circumstances

3. Explosive substance group classification (Group), which is used to subdivide the characteristics of hazardous substances as follows
North American General Explosive Atmospheres
Group A	Acetylene
Group B	Hydrogen	Applicable to Class I (Class I) explosive substances
Group C	Ethylene
Group D	propane
Group E(Group E)	Metal dust (limited area—Div1)
Group F(Group F)	Carbon dust (coal dust)	Applicable to Class II (Class II) explosive substances
Group G	Non-conductive dust (cereal dust)