_______________________________________________________________________________________________________________________________
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 2492-P Issue D 18-03-10 Sheet 3 of 4 (3)
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.
SAFETY WARNING: If the BExBG21D beacon is 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 beacon 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 BExBG21D beacon has dual cable gland entries which
have an M20 x1.5 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 BExBG21D beacon is 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. A four-way terminal block is provided
on the AC beacons, with feeds both boards, therefore there
are two live terminals and two neutral terminals so that both
input and output wiring can be terminated if more than one
beacon is being wired to a single supply. On the DC units
there is a three-way terminal on each of the boards making
up the electronics assembly. The terminal blocks are wired in
parallel with each terminal having a +ve terminal a -ve
terminal and an S2 second stage terminal. Therefore both
input and output wiring can be terminated if more than one
beacon is being wired to a single supply
2 off M20
Cable Entries
Internal Earth Terminal
Figure 3
Internal Bonding
Wire Terminal
BExBG21D Beacon Cover Internal View
Figure 4
Supply
Terminals
BExBG21D DC 21 Joule Beacon
Flash Pattern
Pin Header
BExBG21D AC 21 Joule Beacon
Figure 5
Supply
Terminals
Flash Pattern
Pin Header
Supply
Terminals
