Westermo DDW-221 - Manual (Page 4)

4 6642-22102
General
This unit is intended to be used in Zone 2 hazardous location only.
Marking
II 3G EEx nA II T4
SPECIAL CONDITION
ATEX Information
The Ex mark (Epsilon X mark) is a specific marking for explosive protection
equipment. The mark shows that this unit complies with the requirements of the
relevant European standards that are harmonised with the 94/9/EC Directive.
II
Equipment group II.
This unit can be installed in all places with an explosive gas atmosphere other
than mines susceptible to firedamp.
3G
Category 3G.
A category is the classification according to the required level of protection.
This unit is intended for use in areas in which explosive atmosphere caused by
gases, vapours or mists are unlikely to occur or, if they do occur, are likely to do
so only infrequently and for a short period only.
Equipment in this category ensures the requisite level of protection during normal
operation.
The letter 'G' indicates the protection concerning explosive atmospheres caused
by gases, vapours or mists.
EEx
The marking of "EEx" shows that this unit is in conformity with European Ex
standard(s).
nA
Type of protection applied to electrical equipment to avoid ignition of a surround-
ing explosive atmosphere.
This unit is a non-sparking device "nA" which is constructed to minimize the risk
of occurrence of arcs or sparks capable of creating an ignition hazard during con-
ditions of normal operation.
II
Equipment group II.
This unit can be installed in all places with an explosive gas atmosphere other
than mines susceptible to firedamp.
T4
Temperature class T4.
This unit is classified in accordance with its maximum surface temperature
(external and internal).
SPECIAL
CONDITON
This unit have special condition for use.
The special conditon for use containes safety related information that is necesarry
for the correct installation and safe use.