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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.e2s.com Fax: +44 (0)208 740 4200
Document No. D157-00-201 Issue 3 25-06-20 Sheet 3 of 4
(3)
On completion of the cable wiring installation the flameproof
joints should be inspected to ensure that they are clean and
that they have not been damaged during installation. Also
check that the ‘O’ ring seal is in place. When replacing the
flameproof cover ensure that it is tighten fully with tool
provided.
9)
Power Amplifier Selection
It is important that the loudspeakers are connected to power
amplifiers that have outputs that are compatible to the type of
loudspeaker being used. Loudspeakers with a 70V or 100V
line matching transformer fitted must be connected to a power
amplifier with a 70V or 100V line output. Low impedance 8
ohm or 16 ohm loudspeakers must be connected to amplifiers
with a suitable low impedance output. When 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 run.
The following table shows the range of loudspeakers:-
Unit Type
Input
Wattage
Max.
I/P Volts
GNExL2
100V Line
25W
100V
GNExL2
70V line
25W
70V
GNExL2
8 ohm
25W
14.14V
GNExL2
16 ohm
25W
20V
GNExL1
100V Line
15W
100V
GNExL1
70V Line
15W
70V
GNExL1
8 ohm
15W
10.95V
GNExL1
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 13 of
this instruction manual). GNExL2 70V and 100V Line units
have output levels of 25W, 12.5W, 6W and 2W; GNExL1 70V
and 100V Line units have output levels of 15W, 7.5W, 3W and
1W.
10)
Cable Selection
When selecting the cable size consideration must be given to
the input current that each unit draws (see table 2 of 4), the
number of loudspeakers 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 loudspeakers
connected to the line.
SAFETY WARNING: If temperature exceeds 70ºC at entry or
80ºC at branching point use suitably rated cable and cable
glands.
11)
Earthing
Both AC and DC loudspeaker units must be connected to a
good quality earth. The units are provided with external
earthing terminals which are both located on the terminal
chamber section of the unit (see figures 2 and 3).
When using the external earth terminal a cable crimp lug must
be used. The cable lug should be located between the two M4
stainless steel flat washers. The M4 stainless steel spring
washer must be fixed between the outer flat washer and the
M4 stainless steel nut to ensure that the cable lug is secured
against loosening and twisting.
12)
Cable Glands
The GNExL2 and GNExL1 sounders have 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
standards EN 60079-14:2008 / IEC60079-14:2007.
SAFETY WARNING: If temperature exceeds 70ºC at entry or
80ºC at branching point use suitably rated cable and cable
glands.
If a high IP (Ingress Protection) rating is required then a
suitable sealing washer must be fitted under the cable gland.
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.
Figure 2
Figure 3