Table des Matières
Publicité
Les langues disponibles
Les langues disponibles
2
Principles
Caution
This symbol warns of a possible failure� Failure to observe this
caution may result in the total failure of the device or the system or
plant to which it is connected�
X
Special conditions
ATEX - IEC
This symbol shows Highlights for safe use in accordance to EU-Type-
Examination Certificate/ IEC Ex-Certificate of Conformity.
2�1 Safety instructions
Target group:
For skilled electricians and suitable qualified, instructed
personnel in accordance with national legislation, including
the relevant standards and, where applicable, in acc� with
IEC/EN 60079-14 on electrical apparatus for explosive atmospheres�
The switches GHG 252 are not suitable for zone 0 and zone 20
hazardous areas.
The temperature class and explosion group marked on the appara-
tus, shall be observed.
The requirements of the IEC/EN 60079-31 regarding excessive dust
deposits and temperature to be considered from the user.
To ensure adherence to the temperature class stated on the type
label of the apparatus, the permissible ambient temperature, the
rated terminal cross section and the self-heating of the apparatus,
that is mainly due to the power dissipation, shall be taken into
account
(test criterion for the self-heating is an overload of 10%).
They shall be used for their intended purpose and in perfect and
clean state.
Prior to being put into operation, the switches GHG 252 shall be
checked in accordance with the instructions as per section 6.
Warning: The covers of the switches GHG 252 can only be removed
when the switch is in the "ON" position.
The national safety rules and regulations for the prevention of
accidents, as well as the safety instructions included in these
operating instructions, that, like this text, are set in italics, shall be
observed!
Fig. 1
Switch
GHG 252, Gr.1 and Gr.2
22
Explosion-protected switch
GHG 252
Switch
GHG 252, Gr. 3
3
Conformity with standards
The apparatus are conform to the standards specified in the Declaration
of conformity, enclosed separately.
References to standards and directives in this manual always refer to the
latest version. additional supplements (for example, date information)
must be observed.
4
Field of application
The switches GHG 252 are intended for use in potentially explosive
atmospheres in Zones 1 and 2 as well as in Zones 21 and 22 in accord-
ance with IEC/EN 60079-10-1 and IEC/EN 60079-10-2.
The enclosure materials used, including any external metal parts, are high
quality materials that ensure a corrosion resistance and resistance to
chemical substances according to the requirements for use in a "normal
industrial atmosphere":
– glass-fibre reinforced polyester
– impact resistant polyamide
– special steel AISI 316 L
In case of use in an extremely aggressive atmosphere, you can obtain
information concerning the chemical resistance of the materials used
from your EATON / Cooper Crouse-Hinds branch.
5
Application / Properties
The switches GHG 252 fulfil the isolating properties according to
IEC/EN 60947-3.
In addition to this, the switches GHG 252 are so designed, that they also
switch off the drive, e.g. via the contactor that precedes the auxiliary
contacts. In relation to the main contacts, this auxiliary contacts are
lagging while making and leading while breaking.
Versions with gold-tipped auxiliary contacts are suited for switching
extra-low voltage circuits. Special attention shall be paid to the maximum
current load (see technical data). The contact chamber of the gold-tipped
version is marked with the letter "G" or colour-coded.
Due to the mechanical design of the switch GHG 252, compulsory
opening of the contacts is possible.
To prevent unauthorized switching, the switches GHG 252 can be locked
in the "OFF" position by means of 3 padlocks, see fig. 1 and 7 , (shackle
diameter of the padlocks up to 7 up to 8 mm).
Specially marked auxiliary contacts of the switches GHG 252 can be used
in "intrinsically safe circuits" .
The electrical limiting values that are decisive for the intrinsic
safety shall be observed.
X
The clearances and creepage distances between intrinsically safe
ATEX - IEC
and non-intrinsically safe circuits must be maintained.
(EN/IEC 60079-11).
The data according to sections 3 and 4 shall be taken into account
during use.
Applications other than those described are not permissible without
a written declaration of consent from Messrs. EATON / COOPER
CROUSE-HINDS GmbH.
During operation the instructions stated in section 7 of the operating
instructions shall be observed.
The sole responsibility with respect to the suitability and proper use
of the switches GHG 252 according to the basic requirements of
these instructions (see technical data) lies with the operator�
GB
Publicité
Table des Matières
