Types Of Ignition Protection - WAGO I/O SYSTEM 750 Manual

16 • Use in Hazardous Environments
Classification meeting CENELEC and IEC
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 %

3.3.5 Types of ignition protection

Ignition protection defines the special measures to be taken for electrical
components in order to prevent the ignition of surrounding explosive
atmospheres. For this reason a differentiation is made between the following
types of ignition 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
explosive atmospheres can only be expected to occur rarely or short-term. It
represents 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
manufacturers 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.
T2 T3
42.8 % 25.5 %
94.9 %
IIB IIC
13.8 % 1.0 %
CENELEC IEC
standard standard
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
T4 T5
4.9 % 0 %
*
Number of classified materials
Explanation
Oil encapsulation
Overpressure
encapsulation
Sand encapsulation
Pressure resistant
encapsulation
Increased safety
Cast encapsulation
Intrinsic safety
Electrical components
for zone 2 (see below)
*
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
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