European Safety Systems Ltd.
Impress House, Mansell Road, Acton, London W3 7QH
www.e2s.com
Tel: +44 (0)208 743 8880
Document No. D199-00-501-IS
Issue 4
04-01-21
Sheet 3 of 5
Fig. 2: Fixing Location for Junction Box.
5.2. Access to the Flameproof Enclosure
In order to connect cabling in the junction box it is necessary
to remove the flameproof cover to gain access to the
flameproof chamber. To access the Ex d chamber, loosen the
M4 grub screw on the junction box cover. Open the enclosure
by turning the junction box cover counterclockwise and remove
the cover taking extreme care not to damage the flameproof
threads in the process (see figure 3).
Fig. 3: Accessing the Explosion Proof Enclosure.
On completion of the installation, the flameproof threaded
joints should be inspected to ensure that they are clean and
that they have not been damaged during installation.
Flameproof threaded joints are not permitted to be repaired.
Ensure
that the ‘O’ ring seal is in place.
When replacing 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 junction
box enclosure. Tighten the M4 grub screw.
6) Installation Requirements
6.1. Installation Standards Compliance
Warning
–
High voltage may be
present, risk of electric shock.
DO NOT open when energised,
disconnect power before opening.
The beacon must only be installed by suitably qualified
personnel in accordance with the latest issues of the relevant
standards.
ATEX / IECEx installation standards:
EN60079-14 / IEC60079-14: Explosive atmospheres -
Electrical installations design, selection and erection.
EN60079-10-1 / IEC60079-10-1: Explosive atmospheres -
Classification of areas. Explosive gas atmospheres.
EN60079-10-2 / IEC60079-10-2: Explosive atmospheres -
Classification of areas. Explosive dust atmospheres.
NEC Class / Zone, CEC Class / Zone, and NEC & CEC Class
/ Division installation standards:
National Electrical Code, NFPA 70 or CSA 22.1 Canadian
Electrical Code, Part I, Safety Standard for Electrical
Installations, Section 32.
The installation of the units must also be in accordance with
any local codes that may apply and should only be carried out
by a competent electrical engineer who has the necessary
training.
The STExJ2 is not intended for directly supporting live parts.
All conductors must be suitably insulated and secured against
loosening.
The Junction Box may be fitted with terminal blocks or active
modules up to a power consumption of 5W. Any module fitted
must be secured to the mounting bosses in the base of the
junction box and must maintain a minimum gap of 10mm to all
walls of the enclosure.
6.2. Cable Selection and Connections
When selecting the cable size, consideration must be given to
the input current that each unit draws (see table 1), the number
of junction boxes 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 junction boxes connected
to the line.
Electrical connections are to be made into the terminal blocks
in the flameproof enclosure (see figure 5 and figure 6), 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.
Figure 4: Wire Preparation.
Terminal screws need to be tightened down with a tightening
torque of 0.45 Nm / 5 Lb-in.
Warning
–
Hot surfaces. External surfaces
and internal components may be hot after
operation, take care when handling the
equipment.
