E2S BExCTS110-05D-P Instruction Manual Download Page 4

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European Safety Systems Ltd.

Impress House, Mansell Road, Acton, London W3 7QH

www.e2s.com

Tel: +44 (0)208 743 8880

Document No. D210-00-681-IS

Issue 5

09-05-2023

Sheet 4 of 8

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 combined sounder/beacon 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 or UKEx 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.

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

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

The  combined  sounder  beacon  unit  BExCTS110-05D  has
separate  printed  circuit  boards  in  the  sounder  and  beacon
sections.  The  terminals  for  the  incoming  power  supply  and
telephone signal are on the printed circuit board in the sounder
section  and  the  terminals  for  the  beacon  are  on  the  printed
circuit board in the beacon section (see figures 5a, 5b, 7a and
7b). See section 7 of this manual for access to the enclosure.
See  section  11  and  12  for  AC  and  DC  wiring  diagrams
respectively.

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.