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8. Selection of Cable. Cable Glands, Blanking
Elements & Adapters
When selecting the cable size, consideration must be given to
the input current that each unit draws (see table above), 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 of the sounders
connected to the line.
For ambient temperatures over +40ºC the cable entry
temperature may exceed +70ºC and therefore suitable heat
resisting cables and cable glands must be used, with a rated
service temperature of at least 110ºC
The dual cable gland entries have an M20 x 1.5 entry thread.
To maintain the ingress protection rating and mode of
protection, the cable entries must be fitted with suitably rated
ATEX / IECEx or UKEx certified cable glands and/or suitably
rated ATEX / IECEx or UKEx certified blanking devices during
installation according to EN / IEC60079-14.
If a high IP (Ingress Protection) rating is required then a
suitable sealing washer must be fitted under the cable glands
or blanking plugs.
For use in explosive dust atmospheres, a minimum ingress
protection rating of IP6X must be maintained.
The BEx sounder 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 certified adapters.
9. Earthing
Both AC and DC sounder units must be connected to an earth.
The units are provided with internal and external earth
terminals which are both located on the terminal chamber
section of the unit.
Internal
Earthing
2-off M20
Cable
Entries
Fig. 3 Internal View of Cover
When using the internal earth terminal ensure that the
stainless steel M4 flat washer is between the incoming earth
wire and the enclosure.
Internal earthing connections should be made to the Internal
Earth terminal in the base of the housing using a ring crimp
European Safety Systems Ltd. Impress House, Mansell Road, Acton, London W3 7QH
Document No. D210-00-031-IS
Internal
Bonding
Wire
Terminal
External Earthing
Issue 5
12-09-2022
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. Tighten M4 Earth screw to
1Nm.
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. The external earth conductor should be at
least 4mm² in size. Tighten the Earth nut to 3Nm. Please firmly
tighten the external grounding terminal so that the stud does
not become loose and lay the ground wire so that it is not
caught by twisting and sagging.
10. Cable Connections
Electrical connections are to be made into the terminal blocks
on the PCBA located in the flameproof enclosure. See section
7 of this manual for access to the flameproof enclosure.
Wires having a cross sectional area between 0.5 mm² to
2.5mm² 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 0.45 Nm / 5 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.
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Sheet 4 of 6
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