Quatech INTERBUS S manual Ex-1.3.3 Unit categories, Explosion, Area of use, group

Models: INTERBUS S

1 160
Download 160 pages 62.53 Kb
Page 151
Image 151
Minimal ignition energy of representative types of gases

 

 

 

Application in Explosive Environments

3

 

 

 

Classification meeting CENELEC and IEC

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Minimal ignition energy of representative types of gases

 

 

 

Explosion group

I

 

IIA

IIB

IIC

 

 

 

 

 

 

 

 

 

 

Gases

Methane

 

Propane

Ethylene

Hydrogen

 

 

 

 

 

 

 

 

 

 

Ignition energy (µJ)

280

 

250

82

16

 

 

 

 

 

 

 

 

 

Hydrogen being commonly encountered in chemical plants, frequently the explosion group IIC is requested for maximum safety.

Ex-1.3.3 Unit categories

Moreover, the areas of use (zones) and the conditions of use (explosion groups) are subdivided into categories for the electrical operating means:

Unit

Explosion

Area of use

categories

group

 

M1

I

Fire-damp protection

 

 

 

M2

I

Fire-damp protection

 

 

 

1G

II

Zone 0 Explosive environment by gas, fumes or mist

 

 

 

2G

II

Zone 1 Explosive environment by gas, fumes or mist

 

 

 

3G

II

Zone 2 Explosive environment by gas, fumes or mist

 

 

 

1D

II

Zone 20 Explosive environment by dust

 

 

 

2D

II

Zone 21 Explosive environment by dust

 

 

 

3D

II

Zone 22 Explosive environment by dust

 

 

 

WAGO-I/O-SYSTEM 750 Modular I/O-System

Page 151
Image 151
Quatech INTERBUS S Ex-1.3.3 Unit categories, Minimal ignition energy of representative types of gases, Explosion, group