__________________________________________________________________________________________________________________________________
European Safety Systems Ltd.
Impress House, Mansell Road, Acton, London W3 [email protected] Tel: +44 (0)20 8743 8880
www.e2s.com Fax: +44 (0)20 8740 4200
Document No. IS 2424-P Issue B 17-04-02 Sheet 3 of 4
The following table shows the range of loudspeakers:-
Unit Type
Input
Wattage
Max.
I/P Volts
BExL25E
100V Line
25W
100V
BExL25E
8 ohm
25W
14.14V
BExL25E
16 ohm
25W
20V
BExL15E
100V Line
15W
100V
BExL15E
8 ohm
15W
10.95V
BExL15E
16 ohm
15W
15.49V
The above table also shows the maximum AC signal voltages
at which the loudspeakers can be operated.
The current levels taken by the each loudspeaker will depend
on which output tapping has been selected (see section 14 of
this instruction manual). BExL25E 100V Line units have output
levels of 25W , 12.5W, 6W and 2W, BExL15E 100V Line units
have output levels of 15W, 7.5W , 3W and 1W .
11)
Cable Selection
W hen selecting the cable size consideration must be given to
the current that each unit draws, the number of loudspeakers
on the line and the length of the cable runs.
SAFETY WARNING: If the loudspeakers are used at high
ambient temperatures, i.e. over +40ºC, then the cable entry
temperature may exceed +70ºC and therefore suitable heat
resisting cables must be used, with a rated service
temperature of at least 95ºC.
12)
Earthing
All loudspeakers 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).
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 wires ensure that a good quality
earth is maintained between the flameproof chamber casting,
the terminal section casting and the terminal cover casting.
13)
Cable Glands
The BExL25E and BExL15E loudspeakers 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 ‘e’ applications or better (i.e. Ex ‘d’ applications) can be
used. They must be suitable for the type of cable to be used
and also meet the requirements of the Ex equipment
installation standard BS EN 60079-14: 1997.
SAFETY WARNING: If the loudspeakers 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 ‘e’ blanking plug, which must be suitably
approved for the installation requirements.
14)
Cable Connections
The cable connections are made into an EEx e II approved
twelve way terminal block (six way on low impedance units)
which is located in the Increased Safety Area terminal
chamber (see figure 3). See section 9 of this manual for
access to the terminal chamber. W hen wiring into Increased
Safety Area terminal enclosures, you are only permitted to
connect one wire into each way on the terminal block.
Therefore in order that loudspeakers can be connected in a
parallel line, the terminal block is fitted with approved
connecting combs so that each electrical connection has two
terminals in parallel. Terminal No’s. 1 and 12 (1 and 6 on low
impedance units) must not be used on any units. Cables with a
cross-sectional area of up to 4mm² can be connected to the
terminal block. Cables that have a small cross-sectional area
should be fitted with crimp ferules.
The low impedance loudspeakers are fitted with two pairs of
terminals 2-3 and 4-5.
The 100V Line loudspeakers are fitted with five pairs of
terminals. Terminals 10-11 which are the common and one of
the other four pairs of terminals 8-9, 6 -7, 4-5 or 2-3 should be
selected depending on what output level is required (see the
following table).
BExL25E (25W) BExL15E (15W)
Terminals
100V Line
100V Line
10-11 to 8-9
25W
15W
10-11 to 6-7
12.5W
7.5W
10-11 to 4-5
6W
3W
10-11 to 2-3
2W
1W
15)
End of Line DC Monitoring
On BExL25E and BExL15E loudspeakers, dc line monitoring
can be used if required. Both the 100V Line units and the Low
Impedance units have a blocking capacitor fitted. It should be
noted that each loudspeaker has a 1M ohm bleed resistor
connected across the blocking capacitor and this should be
taken into account when selecting the value of the end of line
monitoring resistance.
The end of line monitoring resistor can be connected to the
end of line unit.
Note the monitoring resistor M UST be
connected to the terminals in the flameproof enclosure, it
M UST NOT be connected to the terminals in the Increased
Safety termination enclosure (see section 8 of this manual
for access to the flameproof enclosure).
Figures 4 and 5
show the terminals in the flameproof enclosures for the 100V
Line and low impedance units respectively.
On the low
impedance units care must be taken with the polarity of the
monitoring voltage.
Cable Entries