What is group IIB?

– Group IIB—Atmospheres containing ethylene, or gases and vapors of equivalent hazard. – Group IIC—Atmospheres containing acetylene or hydrogen, or gases and vapors of equivalent hazard.

Which is an example of group IIA gas?

Gas Groups

What is ex classification?

Products for an explosive environment (Ex/ATEX) are labelled in a standardised manner. All electrical and many non-electrical products that are to be taken into an explosive environment have to satisfy specific Ex/ATEX requirements and must be labelled in a standardised way. …

Is gas Group IIC better than IIA?

Gases in Gas Group IIA require a higher ignition energy than gas groups IIB. Gases in Gas Group IIC require the lowest ignition energy to ignite. As the table below shows, there are only 5 gases in group IIC. Certifying your product for gasgroup IIA & IIB is usually sufficient to cover 98% of the market.

What is ATEX classification?

ATEX is the name commonly given to the two European Directives for controlling explosive atmospheres: 1) Directive 99/92/EC (also known as ‘ATEX 137’ or the ‘ATEX Workplace Directive’) on minimum requirements for improving the health and safety protection of workers potentially at risk from explosive atmospheres.

How do you classify hazardous areas?

Hazardous locations are categorized by class, group, and division as follows. Class I: Denotes areas where flammable gas, vapor, or liquid is present. Class II: Denotes areas where combustible dust is present. Class III: Denotes areas where ignitable fibers are present.

How do you classify gases?

Hazard classification Compressed gases are classified as class I, II, III, or IV in order of decreasing hazard. * Classes are based on the lethal concentration to 50% of test animals (rats) of each gas (LC50).

What is the ex symbol?

Danger Explosive Atmosphere (Ex Symbol) Signs. ‘Danger’ to indicate an immediately hazardous situation which if not avoided will result in death or serious injury. To be limited to the most extreme situations.

What is an ATEX zone?

ATEX generally refers to the hazard of explosive atmospheres occurring in the workplace due to the presence of flammable gasses or combustible dust mixed in air, which can give rise to the risk of explosion.

What are the parameters for electrical area classification?

Before going to the step -by-step method for performing electrical area classification, it should be explained that a classified (hazardous) area is defined by three parameters; these being 1) class, 2) group, and 3) division.

How does the Hazardous Area Classification system work?

The hazardous area classification system determines required protection techniques and methods for electrical installations in the location. The Class/Division/Group system is based on Article 500 of the National Electrical Code (NEC) where Classes – defines the general nature of the hazardous material in the surrounding atmosphere

What are the NEC Division and zone classification systems?

The principles of the NEC Division and Zone classification systems are applied in countries around the globe, such as in the United States. Specifically, Article 500 describes the NEC Division classification system, while Articles 505 and 506 describe the NEC Zone classification system.

What is the basic concept of ex N?

Basic concept: Ex n consists of several sub types of protection. In most cases being simplified versions of existing types of protection: IEC 60079-15