1.3 Intrinsically Safe Switch Circuits; Safety Instructions; Conformity With Standards; Field Of Application - Eaton Crouse-Hinds Série Mode D'emploi

Contact arrangement
EX 29 control switch
Switch mechanism
4 5
Special switch
mechanism
7 8
Control switch, GHG 292 and control switch with measuring
instrument, GHG 293

1.3 Intrinsically safe switch circuits:

Circuitry
Max. safe voltage U
Code
6011
6019
2

Safety instructions

Target group:
For skilled electricians and qualified
6060
personnel in accordance with
national legislation, including the relevant
standards and, where applicable, in acc.
6062
with IEC/EN 60079-14 on electrical appara-
tus for explosive atmospheres.
6065
The temperature class and type of protec-
tion stated on the apparatus shall be
observed.
6033
Modifications or changes to the control
switches are not permitted.
6170
They shall be used for their intended
purpose and shall be in a perfect and clean
state.
. 021
The requirements of the IEC/EN 60079-31
regarding excessive dust deposits and
. 023
temperature to be considered from the user.
Prior to being put into operation, the
. 024
control switches shall be checked in
accordance with the instructions as per
section 6.
. 061
Before initial operation, any foreign matter
shall be removed from the apparatus.
. 063
Warning:
Observe the minimum terminal cross
sections of the control switches according
. 066
to the rated currents (see Technical data,
page 8).
. 067
The national safety rules and regulations for
the prevention of accidents, as well as the
safety instructions included in these
. 049
operating instructions, that, like this text,
are set in italics, shall be observed!
. 037
3

Conformity with standards

. 191
The apparatus is conform to the standards
specified in the EU-Declaration of conformity,
enclosed separately.
References to standards and directives in these
operating instructions always relate to the latest
version. Other additions (e.g. details relating to
6
the year) shall be observed.
The apparatus are conform to the standards
specified in the EC-Declaration of conformity,
enclosed separately.
9
: 690 V
m
Safe galvanic isolation from all other circuits
and earth
4
The control switches are intended for use in
potentially explosive atmospheres in zones 1
and zones 2 as well as in zones 21 and zones
22 in accordance 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":
In case of use in an extremely aggressive
atmosphere, please refer to manufacturer.
5
The control switches are used for the local
switching of electric drives in potentially
explosive gas atmospheres.
The design of the switch contact block (with
max. 3 levels = 6 contacts) is dependent upon
the respective application.
Details relating to the electric contacts can be
found on the switch contact block.
Specially marked special versions of the control
units can be used in "intrinsically safe circuits" .
The electrical limiting values that are decisive
for the intrinsic safety shall be observed.
The version with gold-tipped contacts is suited
for switching extra-low voltage circuits. Special
attention shall be paid to the maximum current
load (see technical data, page 8). The contact
chamber of the gold-tipped version is marked
with the letter "G" or colour-coded.
To ensure a safe and reliable disconnection,
compulsory opening contacts are standard.
A safe and reliable closing of the special contact
is achieved by a special version of the compul-
sory closing contact. The contact chamber of the
compulsory closing contact is marked with the
letter "Z" or it is also colour-coded.
The measuring instruments are used to indicate
the pick-up current of the respective electrical
apparatus (single phase).
See "Technical Data" for details of measuring
mechanism, accuracy and connection.
eff

Field of application

- glass-fibre reinforced polyester
- impact resistant polyamide
- special steel AISI 316 L

Application / Properties

E
9