E2S GNExB2X05 Series Instruction Manual page 4

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 beacons 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 of the beacons
connected to the line.
Electrical connections are to be made into the terminal blocks
on the PCBA, 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.
See section 9.1 for terminal positions.
Internal
Earth Stud
External
Earth Stud
Internal
Earth
Figure 5: GNExB2 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.
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).
Internal earthing connections should be made to the Internal
Earth terminal in the base of the housing using a ring crimp
terminal to secure the earth conductor under the earth clamp.
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 M4
earth stud, using a ring crimp terminal to secure the earth
conductor to the earth stud. The external earth conductor
2
should be at least 4mm in size.
European Safety Systems Ltd. Impress House, Mansell Road, Acton, London W3 7QH
Document No. D156-00-581-IS
M20 x 1.5
Entries
Issue 1 15-11-23
7.3. Cable Glands, Blanking Elements & Adapters
Follow the minimum temperature ratings of cables and cable
glands according to the approvals applied.
The cable entry temperature may exceed +70ºC or the cable
branching point temperature may exceed 80ºC at high
ambient temperatures and therefore suitable heat resisting
cables and cable glands must be used, rated as follows:
Table 2: Min. Ratings of Cables &
Cable Glands.
Cable Glands & Blanking Plugs
Appropriate cable glands to be customer supplied.
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.
If the installation is made using conduit, openings must have
a sealing fitting connected as close as practical to the wall of
the enclosure, but in no case more than the size of the
conduit or 50mm, whichever is the lesser.
When only one cable entry is used the other entries must be
closed with suitably rated and ATEX / IECEx & UKEx certified
blanking plugs.
Ingress Protection
Follow instructions according to the approvals applied.
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 Beacon Range can be supplied with the following
types of adapters:
M20 to 1/2" NPT
M20 to 3/4" 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 as per the
applicable standards.
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