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21.2
Marking According to Zones
Overview
NEC 505:
CENELEC:
Device group I
Device group II
Zone division
Type of protection
Figure 21-2 Overview
Device group I
Table 21-1
Adequate safety
ET 200iS Distributed I/O Station
A5E00087831-02
Class I,
Zone1, AEx ed IIC T6
II 2 G
Device group I
Device group I
Category M1
Extremely high degree of
safety
with 2 protective measures/
if two faults occur
EEx ed IIC T6
Explosion groups acc. to
CENELEC
Categorization of gases, vapors in
explosion groups and temperature
classes
(Mining)
Category M2
High degree of safety
must be turned off if an
explosive atmosphere
occurs
Marking
Temperature classes
21-3
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