__________________________________________________________________________________________________________________________________
European Safety Systems Ltd.
Impress House, Mansell Road, Acton, London W3 7QH [email protected] Tel: +44 (0)208 743 8880
www.e-2-s.com Fax: +44 (0)208 740 4200
Document No. IS 2451-P Issue E 19-02-10 Sheet 3 of 4 (3)
The above table also shows the maximum voltages at which
the sounders can be operated.
9)
Cable Selection
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.
SAFETY WARNING: If the high output BExDS120D sounders
are used at high ambient temperatures, i.e. over +40ºC, then
the cable entry temperature may 70ºC and therefore
suitable heat resisting cables must be used, with a rated
service temperature of at least 110ºC.
10)
Earthing
Both AC and DC sounder units must be connected to a good
quality earth. The units are provided with internal and external
earthing terminals which are both located on the terminal
chamber section of the unit (see figures 2 and 3).
When using the internal earth terminal ensure that the
stainless steel M4 flat washer is between the incoming earth
wire and the enclosure.
When using the external earth terminal a cable crimp lug must
be used. The cable lug should be located between the two M5
stainless steel flat washers. The M5 stainless steel spring
washer must be fixed between the outer flat washer and the
M5 stainless steel nut to ensure that the cable lug is secured
against loosening and twisting.
The internal earth bonding wire ensures that a good quality
earth is maintained between the flameproof chamber casting
and the flameproof cover casting.
11)
Cable Glands
The BExDS120D and BExDS110D sounders have dual cable
gland entries which have an M20 x 1.5 entry thread as
standard. Only cable glands approved for Ex ‘d’ applications
can be used, which must be suitable for the type of cable being
used and also meet the requirements of the Ex ‘d’ flameproof
installation standard EN60079-14:2008 / IEC60079-14:2007.
When only one cable entry is used the other one must be
closed with an Ex ‘d’ flameproof blanking plug, which must be
suitably approved for the installation requirements.
For combustible dust applications, the cable entry device and
blanking elements shall be in type of explosion protection
increased safety "e" or flameproof enclosure "d" and shall have
an IP 6X rating according to EN60529:1992.
SAFETY WARNING: If the high output BExDS120D sounders
are used at high ambient temperatures, i.e. over +40ºC, then
the cable entry temperature may 70ºC and therefore
suitable heat resisting cable glands must be used, with a rated
service temperature of at least 110ºC.
12)
Cable Connections
The cable connections are made into the terminal blocks on
the electronic pcb assembly located in the flameproof
enclosure. See section 7 of this manual for access to the
flameproof enclosure. On the AC units a two-way terminal
block is provided for the live and neutral mains supply wires
and a three way terminal block is provided for linking the
second and third stages, (see figures 5 and 7). On the DC
units a four way terminal block is provided for +ve and –ve
supply input and second and third stage modes of operation,
(see figures 4 and 6).
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
2 off M20
Cable Entries
Internal Earth Terminal
Figure 3
Internal Bonding
Wire Terminal
Figure 4
Figure 5
BExDS120D DC
Sounder
BExDS120D AC
Sounder
Volume Control
DIP Switch
DC Terminals
Stage Headers
Volume Control
DIP Switch
Stage Terminals
AC Terminals
C
S3
S2
N
L
+
-
S3
S2
