Types Of Ignition Protection - WAGO LONWORKS 750-319 Manual

The following table represents the division and attributes of the materials to
the temperature classes and material groups in percent:
Temperature classes
T1
26.6 %
Explosion group
IIA
85.2 %

6.3.5 Types of ignition protection

Ignition protection defines the special measures to be taken for electrical com-
ponents in order to prevent the ignition of surrounding explosive atmospheres.
For this reason a differentiation is made between the following types of igni-
tion protection:
Identifi-
cation
EEx o
EEx p
EEx q
EEx d
EEx e
EEx m
EEx i
EEx n
Ignition protection "n" describes exclusively the use of explosion protected
electrical components in zone 2. This zone encompasses areas where explo-
sive atmospheres can only be expected to occur rarely or short-term. It repre-
sents the transition between the area of zone 1, which requires an explosion
protection and safe area in which for instance welding is allowed at any time.
Regulations covering these electrical components are being prepared on a
world-wide scale. The standard EN 50 021 allows electrical component manu-
facturers to obtain certificates from the corresponding authorities for instance
KEMA in the Netherlands or the PTB in Germany, certifying that the tested
components meet the above mentioned standards draft.
WAGO-I/O-SYSTEM 750
Busklemmen
T2 T3
42.8 % 25.5 %
94.9 %
IIB IIC
13.8 % 1.0 %
CENELEC stan- IEC stan-
dard dard
EN 50 015 IEC 79-6
EN 50 016 IEC 79-2
EN 50 017 IEC 79-5
EN 50 018 IEC 79-1
EN 50 019 IEC 79-7
EN 50 028 IEC 79-18
EN 50 020 (unit) IEC 79-11
EN 50 039 (system)
EN 50 021 IEC 79-15
Use in Hazardous Environments
T4 T5
4.9 % 0 %
*
Number of classified materials
Explanation
Oil encapsulation
Overpressure encapsu-
lation
Sand encapsulation
Pressure resistant
encapsulation
Increased safety
Cast encapsulation
Intrinsic safety
Electrical components
for zone 2 (see below)
• 121
*
T6 Total
0.2 % 432
*
Total
501
Application
Zone 1 + 2
Zone 1 + 2
Zone 1 + 2
Zone 1 + 2
Zone 1 + 2
Zone 1 + 2
Zone 0 + 1 + 2
Zone 2