_______________________________________________________________________________________________________________________________
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. D199-00-101-IS Issue 1 13-07-16 Sheet 4 of 4
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.
12) 70V & 100V Line In Wiring
Fig. 3 Line in Terminals
The cable connections are made into the terminal blocks on
the PCB assembly located in the explosion proof enclosure.
See section 7 of this manual for access to the explosion proof
enclosure. The 70V & 100V Line loudspeakers are fitted with
a five way terminal block. Terminal A is common and one of
the other terminals B, C, D or E should be selected
depending on what output level is required (see table below).
Terminals
STExL2 (25W)
STExL1 (15W)
A - B
25W
15W
A - C
12.5W
7.5W
A - D
6W
3W
A - E
2W
1W
A single wire with a cross sectional area of up to 2.5mm² /
AWG14 can be connected to each terminal way or if an input
and output wire is required two wires can be connected to
each terminal way when crimped with a ferrule. If more than
one wire is fitted into a terminal a ferrule should be used to
secure the wires. When 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.
13) Low Impedance Wiring
Fig. 4 Low Impedance Terminals
STExL2 and STExL1 8
Ω
and 16
Ω
low impedance
loudspeakers have dual input terminals on the PCB assembly
for input and output wiring. A cable of up to 4.0mm² can be
connected to each terminal. If DC line monitoring is used cut
the link on the board (see Fig. 4).
14) Maintenance, Overhaul and Repair
Maintenance, repair and overhaul of the equipment should
only be carried out by suitably qualified personnel in
accordance with the current relevant standards:
EN60079-19/IEC60079-19
Explosive atmospheres – Equipment repair, overhaul and
reclamation
EN 60079-17/IEC60079-17
Explosive atmospheres – Electrical installations inspection
and maintenance
Units must not be opened while an explosive atmosphere is
present.
If opening the unit during maintenance operations a clean
environment must be maintained and any dust layer removed
prior to opening the unit.
Flameproof threaded joints and cemented joints are not
permitted to be repaired.
Electrostatic charging hazard - Clean only with a damp cloth.
A
B
C
D
E
Internal Earth
Terminal
Internal Earth
Terminal
DC Line
Monitoring
Link
+
+
-
-