_______________________________________________________________________________________________________________________________
European Safety Systems Ltd.
Impress House, Mansell Road, Acton, London W3 7QH www.e2s.com Tel: +44 (0)208 743 8880
Document No. D202-00-211-IS Issue 5 16-12-2022 Sheet 4 of 7
Fig 3 Earth terminals
8) Power Supply Selection
Electrical Ratings
250Vac max. / 3.3A max
48Vdc max. / 1.0A max
24Vdc max / 3.0A max
Electrical connections are to be made into the terminal blocks
/ DIN rail provided. See Section 11 for wiring options.
9) Selection of Cable. Cable Glands, Blanking
Elements & Adapters
For high ambient temperatures the cable entry temperature
may 70ºC or the cable branching point temperature
may exceed 80ºC and therefore suitable heat resisting cables
and cable glands must be used, with a rated service
temperature of at least the values stated below:
The cable gland entries have an M20 x 1.5 entry thread. Only
suitably rated and ATEX / IECEx / UKEX certified cable
glands which must be suitable for the type of cable being
used and also meet the requirements of the current Ex ‘d’
flameproof installation standards EN 60079-14 / IEC60079-
14.
When only one cable entry is used the other entries must be
closed with suitably rated and ATEX / IECEx / UKEX certified
blanking plugs.
If a high IP (Ingress Protection) rating is required then a
suitable sealing washer must be fitted under the cable glands
or blanking plugs.
The GNExCP7 Call Point range can be supplied with the
following types of adapters:
M20 to ½” NPT
M20 to ¾” NPT
M20 to M25
It is important to note that stopping plugs cannot be fitted
onto adapters, only directly onto the M20 entries.
Any other adapters used must be suitably rated and ATEX /
IECEx / UKEX certified adapters.
10) Cable Connections
Electrical Connections are to be made into the terminal
blocks using solid or stranded wire. See section 6 of this
manual for access to the flameproof enclosure.
Wires having a cross sectional area between 0.5 mm² to
2.5mm² (AWG 20 – 14) can be connected to each terminal
way.
If an input and output wire is required the 2-off Live/Neutral or
+/- terminals can be used. If fitting 2-off wires to one terminal
way the sum of the 2-off wires must be a maximum cross
sectional area of 2.5mm².
Strip wires to 8mm. Wires may also be fitted using ferrules.
Terminal screws need to be tightened down with a tightening
torque of:
DIN Rail Terminals: 0.51 Nm / 4.5 Lb-in;
Connector Block Terminals: 0.87 Nm / 7.7 Lb-in;
PCBA P1 Terminals: 0.45 Nm / 4.0 Lb-in;
PCBA EOL and Series (1 & 2) Terminals: 0.38 Nm / 3.4 Lb-in
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.
11) Wiring Unit
The units come with two options for the terminal block.
A DIN rail version which has 8-way connection and allows for
limited wiring of EOL devices.
For Single Switch models GNExCP7-PT-S / GNExCP7-PM-S
/ GNExCP7-PB-S:
For Dual Switch models GNExCP7-PT-D / GNExCP7-PM-D /
GNExCP7-PB-D:
The PCB Terminal Version has a 6-way connector but is
designed to allow for full configuration with Series and EOL
devices in a number of wiring configurations.
For EOL and Series device limitations and configurations see
Section 13.
For wiring schematic see document D202-06-211
Max. ambient temperature (°C)
55
60
65
70
req. Cable/Cable Gland rating(°C):
80
85
90
95
Max. ambient temperature (°C) 45
50
55
60
65
70
req. Cable/Cable Gland
rating(°C):
80
85
90
95 100 105
Wiring terminal
Internal Earthing
External Earthing
