What is the group based on in the class division system?

What is the group based on in the class division system?

Group Definition Materials have been placed in groups based on their ignition temperatures and explosion pressures. Class I and Class II Divisions are further subdivided into Groups of hazardous materials. The Groups define substances by rating their flammable nature in relation to other known substances.

What is Zone area classification?

Hazardous areas are classified into 3 zones based upon the frequency of the occurrence and duration. of an explosive gas atmosphere, as follows: Zone 0. Area in which an explosive gas atmosphere is present continuously or for long periods or frequently.

What is the difference between zone and division?

Division 2 is equivalent to Zone 2, while Division 1 is either Zone 0 or 1. Zone 0 is reserved for those areas continuously hazardous (e.g., inside a vented fuel tank), so other Division 1 areas would be classified as Zone 1….Zone-selective interlocking.

Which is bigger zone or division?

Indian Railways divides its operations into zones, which are further sub-divided into divisions, each having a divisional headquarters.

Which is better gas group IIA or IIB?

Any equipment which is marked as IIC can be used in atmospheres that contain Group IIB and Group IIA gasses. Conversely equipment marked IIA cannot be used in IIB or IIC explosive environments….Gas Groups.

What is Class I Div II?

Class I Hazardous Locations refer to facilities which deal with flammable gases, vapors, and liquids. Division 2 specifies that these flammable materials are handled, processed, or used in the defined hazardous location, but are not normally present in concentrations high enough to be ignitable.