Safety Instructions; Conformity With Standards; Field Of Application; Application / Properties - Eaton CROUSE-HINDS Série Mode D'emploi

Explosion-protected control units
GHG 411 and 412
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Safety instructions

Target group:
a
For skilled electricians and qualified
personnel in accordance with
national legislation, including the relevant
standards and, where applicable, in acc.
with IEC/EN 60079-14 on electrical appara-
tus for explosive atmospheres.
The control units GHG 411 and GHG 412 are
not suitable for zone 0 and Zone 20 hazard-
ous areas.
The temperature class and type of protec-
tion stated on the apparatus shall be
observed.
Modifications or changes to the control
units are not permitted.
They shall be used for their intended
purpose and shall be in a perfect and clean
state.
The requirements of the IEC/EN 60079-31
regarding excessive dust deposits and
temperature to be considered from the user.
Only original CEAG parts may be used as
replacements and for repairs.
Repairs that affect the explosion protection
may only be carried out by COOPER
Crouse-Hinds or by a qualified electrician in
compliance with the respective national
regulations.
Prior to being put into operation, the control
units shall be checked in accordance with
the instructions as per section 6.
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!!
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Conformity with standards

The apparatus is conform to the standards
specified in the EC-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
the year) shall be observed.
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Field of application

The control units are intended for use in
potentially explosive atmospheres in zones 1, 2
as well as in Zones 21 and 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"
- impact resistant polyamide
- special steel AISI 316 L.
In case of use in an extremely aggressive
atmosphere, please refer to manufacturer.
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Application / Properties

The control units GHG 411 and 412 are
intended for the local control of electrical
installations in potentially explosive atmos-
pheres. The units are fitted with built-in
components according to the respective
application.
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). The contact chamber
of the gold-tipped version is marked with the
letter "G" or colour-coded.
To ensure a safe and reliable disconnection, the
normally closed contacts are designed as
compulsory opening contacts.
Where required, the bases are fitted with 0.6 W
resistors, fine-wire fuses and diodes
(max. power dissipation 1 W).
The measuring instruments AM/VM72 and
AM/VM45 are used for the local indication of
electrical values. See "Technical Data" for
details of measuring mechanism, accuracy and
connection.
With measuring instruments AM/VM72 and
AM/VM45 for c.t. connection n/1A (Fig. 1,
item 2) the interchangeable scales can be
exchanged via a flap on the upper part of the
measuring instrument (Fig. 1, item 1).
When the switch collar of small control
switches is cut out at the respective locking
position, they can be padlocked (padlock
shackle Ø up to 5 mm).
E
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