E2S Warning Signals Impress House, Mansell Road, Acton, London W3 7QH
Document No. D199-00-101-IS
On completion of the installation, the flameproof threaded joint
should be inspected to ensure that they are clean and that they
have not been damaged during installation. Repair of the
flamepath / flameproof joints is not permitted. Also check that
the ‘O’ ring seal is in place. When fitting the flameproof cover
ensure the thread is engaged correctly. Fully tighten the cover
all the way, ensure no gap is visible between the cover and
base of the loudspeaker enclosure. Tighten the M4 grub
screw.
8) Power Supply Selection
It is important that a suitable power supply is used to run the
loudspeaker. The power supply selected must have the
necessary capacity to provide the input current to all of the
loudspeakers
The following table shows the input current taken by the
various loudspeakers:
A supply voltage variation of +/-10% outside the voltage range
is permissible.
Nominal current at nominal voltage
Max rated current at worst case supply voltage and flash rate.
9) Selection of Cable. Cable Glands, Blanking
Elements & Adapters
When selecting the cable size, consideration must be given to
the input current that each unit draws (see table above), the
number of loudspeaker 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.
For ambient temperatures over +40ºC the cable entry
temperature may exceed +70ºC and therefore suitable heat
resisting cables and cable glands must be used as per table
below
STExL1:
Min. Rating
of cables
and cable
glands
STExL2:
Min. Rating
of cables
and cable
glands
The cable entries have an M20 x 1.5 –6H entry thread. If the
installation is made using cable glands, only suitably rated and
ATEX / IECEx & UKEx certified cable glands must be used.
They must be suitable for the type of cable being used and
also meet the requirements of the current installation
standards EN 60079-14 / IEC60079-14.
Any unused cable entries must be closed with suitably rated
and ATEX / IECEx & UKEx certified blanking plugs.
If the installation is made using conduit, openings must have a
sealing fitting connected as close as practical to the wall of the
enclosure, but in no case more than the size of the conduit or
50mm, whichever is the lesser.
If a high IP (Ingress Protection) rating is required then a
suitable sealing washer must be fitted under the cable glands
or blanking plugs. A minimum ingress protection rating of IP6X
must be maintained for installations in explosive dust
atmospheres.
For combustible dust applications, the cable entry device and
blanking elements shall be in type of explosion protection and
shall have an IP 6X rating.
The STEx loudspeaker range can be supplied with the
following types of adapters:
M20 to ½” NPT
M20 to ¾” NPT
M20 to M25
It is important to note that stopping plugs cannot be fitted onto
adapters, only directly onto the M20 entries.
Any other adapters used must be suitably rated and ATEX /
IECEx & UKEx certified adapters.
10) Earthing
Both AC and DC loudspeaker units must be connected to an
earth according to EN/IEC 60079/14. The units are provided
with internal and external earth terminals which are both
located on the terminal chamber section of the unit
Internal earthing connections should be made to the Internal
Earth terminal in the base of the housing using a ring crimp
terminal to secure the earth conductor under the earth clamp.
The earth conductor should be at least equal in size and rating
to the incoming power conductors.
External earthing connections should be made to the M5 earth
stud, using a ring crimp terminal to secure the earth conductor
to the earth stud. The external earth conductor should be at
least 4mm2 in size.
11) Cable Connections
Electrical connections are to be made into the terminal blocks
on the PCBA located in the flameproof enclosure. See section
7 of this manual for access to the flameproof enclosure.
Wires having a cross sectional area between 0.5 mm² to
2.5mm² can be connected to each terminal way. If an input and
output wire is required the 2-off Live/Neutral or +/- terminals
can be used. If fitting 2-off wires to one terminal way the sum
of the 2-off wires must be a maximum cross sectional area of
2.5mm². Strip wires to 8mm. Wires may also be fitted using
ferrules. Terminal screws need to be tightened down with a
tightening torque of 0.45 Nm / 5 Lb-in. 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.
