Screw Plugs; Plastic*-Metal Flanges, Metal Plates And External Earth Connection; Closing Apparatus - Eaton 20 A GHG 262 Betriebsanleitung

Fig. 5 External earth connection
Inner wall of enclosure
Internal earth plate
Internal earth connection
The cable lugs should be crimped onto the cable in a workman-
like manner. It is to be ensured that the required min. air gaps are
kept (at 690 V > 12 mm).
When combining Ex-e/Ex-i it is essential to maintain the separation,
air and creepage distances.
The Ex-i circuit wires are to be laid separately from the Ex-e circuit
wires (see e.g. EN/IEC 60079-11).
The connection wires of the Ex-i circuits are to be marked (e.g. by
colour, light blue).
When apparatus is open, (isolate voltage supply), it is necessary to
ensure that no voltage is carried over into the connected intrinsically
safe circuits.
All screws and/or nuts of connection terminals, including those not in
use, shall be tightened down securely.
Excessive tightening may affect or damage the connection.
The terminals are designed for the direct connection of conductors with
copper wires.
If multi- or fine-wire connection cables are used, the wire ends shall be
handled acc. to the applicable national and international regulations (e.g.
use of multicore cable ends).
The position of the connection terminals is shown in the wiring diagrams on
the switch base and technical data of these operating instructions.
To ensure that the switch GHG 26 closes correctly, switching at the
switch shaft of the switch insert is not permitted when the apparatus is
open.
If, to facilitate the feeding of conductors into the enclosure, the switch
insert is removed from the enclosure base, it shall be put back correctly
before the electrical connection is made.
When fitting the apparatus cover, care shall be taken to ensure that the
switch shaft of the switch insert engages correctly in the carrier hole of
the switch handle (pay attention to the correct position of the switch
handle).
6�3 Cable entries (KLE); blanking plugs; screw plugs
Generally, only certified cable entries, screw plugs and blanking
plugs may be used.
Flexible cables shall be used with trumpet-shaped cable glands or
other suitable entries with additional pull-relief.
Explosion-protected switch
20 A - 180 A
When using cable entries with a lower IP protection than that which
applies to the device (see technical data), the IP protection of the
complete unit is reduced.
Intrinsically safe circuits shall be fed through cable entries that
are colour-coded (light blue).
The relevant mounting directives applicable to the cable entries
fitted shall be observed.
In order to ensure the minimum degree of protection, any unused entry
holes shall be sealed with certified blanking plugs or screw plugs.
When fitting cable entries, care has to be taken that the sealing inserts
are suitable for the cable diameter. In the case of sealing inserts that are
cut out, it is necessary to ensure that the insert is properly adapted to the
cable diameter.
In order to ensure the required minimum degree of protection, the cable
entries shall be tightened down securely (see technical data).
Overtightening can impair the degree of protection.
When tightening the cap nut of the metal cable entry (e.g. type ADL/
ADE), a suitable tool shall be used to safeguard the gland against
twisting.
Any unused cable entries shall be sealed with the blanking plug certified
for these cable entries.
6�4
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 incorpo-
rated in the potential equalization.
* not yet certified for category II D
6�5
Any foreign matter shall be removed from the apparatus.
The switch handle on the cover of the switch is to be set to the "ON"
position.
When fitting the apparatus cover, care shall be taken to ensure
that the switch shaft of the switch insert engages correctly in the
carrier hole of the switch handle.
To ensure the required minimum degree of protection, the cover screws
shall be tightened down (see technical data).
Overtightening may impair the degree of protection.
Plastic*-metal flanges, metal plates and
external earth connection

Closing apparatus

GB
21