E2S D1xS2FDC024-A, Instruction Manual, Page: 4 / 20

European Safety Systems Ltd. Impress House, Mansell Road, Acton, London W3 7QH www.e2s.com Tel: +44 (0)208 743 8880
Document No. D190-00-101-IS Issue 2 17-03-2022 Sheet 4 of 8
7.4 Access to the Explosionproof Enclosure
Fig 2: Accessing the enclosure
To access the Ex d chamber, loosen the M4 grub screw on the
sounder cover. Open the enclosure by turning the sounder cover
counterclockwise and remove the cover. Take extreme care not
to damage the explosionproof threads in the process.
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.
Ensure the O-ring seal is in place and undamaged.
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 sounder enclosure.
8) Installation Requirements
8.1 Safe Installation Requirements
Warning
– High voltage may be
present, risk of electric shock.
DO NOT open when energised,
disconnect power before opening.
The sounder must only be installed by suitably qualified
personnel in accordance with the latest issues of the relevant
standards.
The product must only be installed by suitably qualified personnel
in accordance with the latest issues of the relevant standards.
The installation of the units must also be in accordance with the
NEC / CEC and any local regulations and should only be carried
out by a competent electrical engineer who has the necessary
training.
8.2 Cable Selection and Connections
Electrical connections are to be made into the terminal blocks on the
PCBA, using solid wire 0.5-4mm2 / AWG 20-12 or stranded wire,
sizes 0.5-2.5mm2 / AWG 24-14. Wire insulation needs to be stripped
8mm. Wires may be fitted securely with crimped ferrules. Terminal
screws need to be tightened down with a tightening torque of 0.45
Nm / 3.5 Lb-in.
When selecting the cable size, consideration must be given to the input
current that each unit draws (see table 1), the number of sounders 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 the
sounders connected to the line.
AC: 1.0 - 2.5mm
2
/ AWG18 - AWG12
DC: 0.2 - 2.5mm
2
/ AWG24 - AWG12
Fig 3: Wire Preparation.
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.
8.3 Earthing
Fig. 4 Earth Locations
The unit has both a primary internal and secondary external earth
fixing point.
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 but at least a mini mum of 0.82mm2 / 18AWG in
size.
External earth connections can be made to the M5 earth stud (see
Fig. 4), using a ring crimp terminal to secure the earth conductor
to the earth stud. The external earth conductor should be at least
4mm
2 in size.
The external earth crimp ring should be located between the two
M5 plain washers provided and securely locked down with the M5
spring washer and M5 nut.
8.4 Cable Glands, Blanking Elements & Adapters
Ingress Protection
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.
To maintain the ingress protection rating and mode of protection,
the cable entries must be fitted with suitably rated cable entry
and/or blanking devices during installation.
If entries are fitted with adaptors they must be suitably rated for
the application. Fitting of blanking elements into adaptors is not
permitted.
Adapters
The D1x sounder 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.
Internal Earth
Marked with G
External Earth
8mm