E2S BExL15D 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. D210-00-101-IS

Issue 6

12-09-2022

Sheet 4 of 5

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 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. 70V & 100V Line In Wiring

The cable connections are made into the terminal blocks on
the PCB assembly located in the explosion proof enclosure.
See section 7 of this manual for access to the explosion proof
enclosure. The 70V & 100V Line loudspeakers are fitted with
a five way terminal block. Terminal A is common and one of
the other terminals B, C, D or E should be selected
depending on what output level is required (see table below).

Terminals BExL25D (25W) BExL15D (15W)

A – B

25W

15W

A – C

12.5W

7.5W

A – D

A – E

A single wire with a cross sectional area of up to 4mm² can be
connected to each terminal way or if an input and output wire
is  required  two  2.5mm²  wires  can  be  connected  to  each
terminal  way.  When  connecting  wires  to  the  terminals  great
care should be taken to dress the wire 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 and above.