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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 2462-P Issue E 12-03-10 Sheet 3 of 3
10)
Earthing
The Flashtel unit 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 BExTBG05D Flashtels have dual cable gland entries
which have an M20 x1.5 entry thread as standard (see cable
connections section12 of this manual). 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 BExTBG05D Flashtels 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.
The printed circuit board has two terminal blocks, one for the
mains supply input voltage and one for the telephone signal
input cable (see figure 4). The mains input cable should enter
the enclosure via one of the M20 cable entries and be
connected to the supply terminals L and N and the telephone
signal cable should enter the enclosure via the other M20
entry and be connected to the telephone terminal.
Wires having a cross sectional area of up to 4mm² can be
connected to each terminal way. 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.
BExTBG05D Flashtel Cover Internal View
Figure 4
BExTBG05D 5 Joule Flashtel
Mains Supply
Input Terminals
L and N
Telephone Signal
Input Terminals
2 off M20
Cable Entries
Internal Earth Terminal
Figure 3
Internal Bonding
Wire Terminal
