Siemens SIMATIC ET 200iS Manual page 364

Marking
Sand filling q
Encapsulation m
Type of Protection n Zone 2
Several methods of
ignition protection
methods are included in
this type of protection
* ia = use in zone 0, 1, 2; ib = use in zone 1,2; [EEx ib] = corresponding electrical equipment – installation
in safe area
Explosion Groups
Table 21-5
Explosion group
I
II A
II B
II C
21-6
Types of Protection
Transformers, capacitors, heating
conductor terminal box
Switching devices for small loads,
command and signaling devices,
display devices, sensors
All electrical equipment for zone 2,
less suitable for switching devices
and switchgear
Explosion Groups
Explosion Groups according to CENELEC / NEC 505
Typical gas
Methane
Propane
Ethylene
Hydrogen
ET 200iS Distributed I/O Station
EN 50 017
IEC 60 079-5
FM 3600
UL 2279
EN 50 028
IEC 60 079-18
FM 3600
UL 2279
EN 50 021
IEC 60 079-15
A5E00087831-02