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INSTRUCTION MANUAL
GNExS1
Alarm Horn Sounder with relay / telephone initiate
For use in Flammable Gas Atmospheres
7.2 Cable Selection and Connections
When selecting the cable size, consideration must be given to
the input current that each unit draws (see table 1), the number
of sounders on the line and the length of the cable runs. The
cable size selected must have the necessary capacity to
provide the input current to all the sounders connected to the
line.
Electrical connections are to be made into the terminal blocks
on the PCBA located in the flameproof enclosure using solid
wire 0.5-4mm² / AWG 20-12 or stranded wire, sizes 0.5-
2.5mm² / AWG 24-14. Wire insulation needs to be stripped
8mm. Wires may be fitted securely with crimped ferrules.
Figure 4: Wire Preparation.
Terminal screws need to be tightened down with a tightening
torque of 0.45 Nm / 5 Lb-in. An 8-way terminal block is
provided on the AC Sounder, and a 6-way terminal block is
provided on the DC Sounder.
Figure 5: GNExS1 Entries and Terminal Block Location.
When connecting wires to the terminals great care should be
taken to dress the wires so that when the cover is inserted into
the chamber the wires do not exert excess pressure on the
terminal blocks. This is particularly important when using
cables with large cross-sectional areas such as 2.5mm².
7.3 Earthing
Please note that for AC supply voltage product versions the
Earth terminal on the PCBA does not provide an earth
connection to the product enclosure. The enclosure must be
independently earthed using either the external or internal
earth fixing point, (see fig 5 and notes below).
Both AC and DC sounder units must be connected to an earth
according to EN/IEC 60079/14. The units are provided with
internal and external earth terminals which are both located on
the terminal chamber section of the unit (see figure 5).
European Safety Systems Ltd. Impress House, Mansell Road, Acton, London W3 7QH
Document No. D157-00-681-IS
Issue 1
27-04-2023
Internal earthing connections should be made to the Internal
Earth Stud of the housing using a ring crimp terminal to secure
the earth conductor between the two M4 stainless steel flat
washers. The earth conductor should be at least equal in size
and rating to the incoming power conductors.
External earthing connections should be made to the M5 earth
stud, using a ring crimp terminal to secure the earth conductor
to the earth stud between the two M5 stainless steel flat
washers, then reassemble the M5 spring washer and tighten
the M5 nut to ensure that the cable lug is secured against
loosening and twisting. The external earth conductor should be
2
at least 4mm
in size.
7.4 Cable Glands, Blanking Elements & Adapters
For high ambient temperatures the cable entry or the cable
branching point temperatures may exceed:
70ºC at entry point.
80ºC at branching point.
Therefore, suitable heat resisting cables and cable glands
must be used, with a rated service temperature at least as
stated in the table below:
Max Ambient Temperature (ºC)
Model
40
45
GNExS1
70
Table 2: Min. Ratings of Cables & Cable Glands.
Cable Glands
Appropriate cable glands to be customer supplied.
The cable entries have an M20 x 1.5 – 6H entry thread. Only
suitably rated and certified cable glands must be used. They
must be suitable for the type of cable being used and also meet
the requirements of the current installation standards EN
60079-14 / IEC60079-14.
Blanking Plugs
When only one cable entry is used the other entries must be
closed with suitably rated and certified blanking plugs as per
type of approval.
Any unused cable entries must be closed with suitably rated
blanking plugs.
Ingress Protection
If a high IP (Ingress Protection) rating is required, then a
suitable sealing washer must be fitted under the cable glands
or blanking plugs. A minimum ingress protection rating of IP6X
must be maintained for installations in explosive dust
atmospheres.
Adapters
The GNEx sounder range can be supplied with the following
types of adapters:
www.e2s.com
50
55
60
65
75
80
85
90
Tel: +44 (0)208 743 8880
Sheet 4 of 6
70
95
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