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European Safety Systems Ltd.
Impress House, Mansell Road, Acton, London W3 7QH [email protected] Tel: +44 (0)20 8743 8880
www.e2s.com Fax: +44 (0)20 8740 4200
Document No. IS 2425-P Issue B 17-04-02 Sheet 3 of 4
earthing terminals which are both located on the flameproof
cover section of the unit (see figures 2 and 3).
W hen 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.
12)
Cable Glands
The BExA120D and BExA110D Appello units have dual cable
gland entries which have an M20 x1.5 entry thread as standard
or a PG13.5 thread as a special. 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 BS EN 60079-14 :
1997.
SAFETY WARNING: If the Appello’s are used at high ambient
temperatures, i.e. over +40ºC, then the cable entry
temperature may exceed +70ºC and therefore suitable heat
resisting cable glands must be used, with a rated service
temperature of at least 95ºC.
If a high IP (Ingress Protection) rating is required then a
suitable sealing washer must be fitted under the cable gland.
W hen 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.
13)
Cable Connections
Before the Appello is installed in a hazardous area, the
required message to be broadcast should be recorded on the
units, see section 14 of this instruction manual.
The cable connections are made into the terminal blocks on
the electronic pcb assembly located in the flameproof
enclosure. See section 8 of this manual for access to the
flameproof enclosure. On the AC units a three-way fused
terminal block is provided for the live and neutral mains supply
lines (see figure 5). To gain access to the terminal block,
remove the terminal cover by unscrewing the nylon nut. The
earth terminal in the center of the three-way terminal block is
provided for use when a message is being recorded, see
section 14 of this instruction manual. The internal earth
terminal in the cover should be used when installing the unit.
On the DC units a two-way terminal block is provided for +ve
and –ve supply lines (see figure 4).
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 on DC units and two 1.5mm² wires can be
connected to each terminal way on AC units. W hen 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.
2 off M20
Cable Entries
Internal Earth Terminal
Figure 3
Internal Bonding
Wire Terminal
Figure 5
Volume Control
Tone and Record
Headers
Microphone
Push Switch
LED
BExA120D and BExA110D AC Appello
L E N
Terminal Cover
AC Terminals
Figure 4
BExA120D and BExA110D DC Appello
Volume Control
DC Terminals
Tone and Record
Headers
Microphone
Push Switch
LED
+
-
A
B
C
R
