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6�3 Cable entries (KLE); blanking plugs
Generally, only certified cable entries and blanking plugs may be
used.
Flexible cables shall be used with trumpet-shaped cable glands or
other suitable entries with additional pull-relief.
The directives for mounting applicable to the cable entries fitted
shall be observed.
When mounting cable entries of a lower IP protection than that of the
apparatus (see page 8), the IP protection of the whole unit will be reduced�
In order to establish the minimum protection category, unused entry
holes shall be closed with a certified blanking plug�
Care has to be taken that when fitting the cable entries, sealing inserts
appropriate to the cable diameter be used� In case of sealing inserts that
are cut out, it will have to be ensured that the insert is properly adapted to
the cable diameter�
In order to ensure the required minimum protection category, the cable
entries will have to be tightened down�
Overtightening might impair the protection category.
6�4 Plastic -metal flanges, metal plates and
external earth connection
If flange plates have to be dismantled, (e�g� to drill entry holes), when
replacing the plates,in order to maintain the minimum degree of
protection, it is necessary to ensure that the flange plate and the fixing
clamp fit correctly�
PE conductors fed from outside shall be connected to the PE
terminal provided on the flange.
In case an external earth connection is mounted on the plastic enclosure,
it should be connected with a max� 25 mm² wire�
This earth connection is inserted through a M6 drill in the inner wall of the
enclosure (see fig� 5)�
Metal flanges, metal plates and metal glands shall be incorporat-
ed in the potential equalization.
6�5 Closing the device / cover closure
The switch toggle of the switches shall be in ON position� When placing
the cover take care that the shaft of the switch engages in the tappet hole
of the switch toggle�
Any foreign matter shall be removed from the apparatus.
In order to ensure the required minimum protection category, the cover
screws shall be tightened down�
Overtightening might impair the protection category.
6�6 Putting into operation
Before putting the apparatus into operation, the tests specified in the
individual national regulations shall be performed�
In addition to this, before being put into operation, the correct functioning
of the apparatus and installation of the apparatus shall be checked in
accordance with these operating instructions and other applicable
regulations�
The improper operation of switches GHG 981 may result in the
invalidation of the guarantee.
6�6�1 Switch on
Turn switch handle clockwise to position
"I","ON", "EIN" �
Perform the rotational movement quickly�
6�6�2 Switch off
Fig� 6 A
Turn switch handle counterclockwise to position "0","OFF", "AUS"�
Perform the rotational movement quickly�
If an unusually high force, e�g� a second hand, is required, the switch shall
be isolated from the supply immediately by means of the upstream
external protective device and checked by a qualified electrician acc� to
IEC/EN 60079-19�
6�6�3 Lock out
Fig� 6 B
To prevent unauthorized switching, the explosion- protected switches can
be locked in the „OFF“ position by means of 3 padlocks�
Switches GHG 981 - 10 A:
shackle diameter of the padlocks up to 4 up to 6 mm�
Preferable 6 mm�
Switches GHG 981 - 25 ��� 250 A:
shackle diameter of the padlocks up to 7 up to 8 mm�
Preferable 6 mm�
Switches, GHG 981,
industrial design up to 250 A, 3 and 6-pole
GB
Fig� 6
A
B
Fig� 5 External earth connection
Inner wall of enclosure
Internal earth plate
Internal earth connection
