What is Zone 21 ATEX?

ATEX Zone 21 Definition – What is Zone 21? A Zone 21 area is classified as a place in which an explosive atmosphere consisting of a mixture with air or flammable substances in the form of powder or dust is likely to occur in normal operation occasionally.

What is Zone 22 ATEX?

ATEX Zone 22 Definition – What is Zone 22? A Zone 22 area is classified as an atmosphere where a mixture of air and flammable substances in the form of powder or dust is not likely to occur in normal operation, but if it does occur, will persist for a short period only.

Does Class 2 Div 2 require explosion proof?

While Division 1 motors in Class I locations must be explosion-proof, Class II, Division 1 motors must be dust- ignition-proof.

What is Gas Group IIC?

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

What is the difference between Zone 21 and Zone 22?

This is done either by reference to explosion data or through dust explosion testing. Once flammability is established, zoning is determined following the grade of release: continuous grade of dust release is zone 20; primary grade of dust release is zone 21; secondary grade of dust release is zone 22.

Is gas Group IIC better than IIB?

Gas Groups Gas explosion protection is divided into 3 groups: IIA, IIB and IIC. Gases in Gas Group IIA require a higher ignition energy than Gas Group IIB. Gases in Gas Group IIC require the lowest ignition energy to ignite.

What is zone 20?

Continuous release inside a dust containment enclosure gives rise to Zone 20 – a place in which an explosive atmosphere, in the form of a cloud of combustible dust in air, is present continuously, or for long periods or frequently for short periods. For example, a mill or pneumatic conveying system.

Are index enclosures Zone 1&zone 21 safe?

For zone 1 & 21;- intrinsically safe terminals, with full assembly and certification for zone 1, and protection by enclosure for Zone 21. indEx enclosures are ideally suited to intrinsically safe zone 0, 1 Field Bus systems.

What is zone 20 of the Dust Regulations?

Continuous release inside a dust containment enclosure gives rise to Zone 20 – a place in which an explosive atmosphere, in the form of a cloud of combustible dust in air, is present continuously, or for long periods or frequently for short periods.

What is a zone 21 hazardous area?

Primary grade of release is classified as a Zone 21 hazardous area – a place in which a potentially explosive atmosphere, in the form of a cloud of combustible dust in air, is likely to occur occasionally in normal operation. For example, bagging points and inspection ports that are frequently opened.