_______________________________________________________________________________________________________________________________
European Safety Systems Ltd.
Impress House, Mansell Road, Acton, London W3 7QH
Tel: +44 (0)208 743 8880
www.e-2-s.com
Fax: +44 (0)208 740 4200
Document No. D156-00-501-IS
Issue 1
11-12-15
Sheet 2 of 3
Equipment Category:
2G/D
Ambient Temperature Range:
-50
°
C to +70
°
C
Maximum Surface Temperature for Dust Applications:
80ºC
6)
Location and Mounting
The Junction Box should only be fixed to services that can
carry the weight of the unit.
The junction box should be securely bolted to a suitable
surface using the 9.4mm diameter bolt holes in the base of
the unit (see figure 1).
7)
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 2).
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 intended to be repaired.
Also check 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.
8)
Electrical Ratings
Type No.
Max. Power Dissipation
GNExJ2
5W
9)
Cable Selection
When selecting the cable size, consideration must be given
to the input current that each unit draws (see table above),
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.
SAFETY WARNING: The cable entry temperature may
70ºC or the cable branching point temperature may
exceed 80ºC at high ambient temperatures and therefore
suitable heat resisting cables and cable glands must be used,
rated 80ºC for ambient temperatures of 70ºC.
10)
Earthing
The junction box units must be connected to a good quality
earth. The units are provided with internal and external earth
terminals which are both located on the flameproof enclosure
section of the unit (see figures 4 or 5).
11)
Cable Glands
The cable gland entries have an M20 x 1.5 entry thread. Only
suitably rated and ATEX / IECEx certified cable glands which
must be suitable for the type of cable being used.
When only one cable entry is used the other entries must be
closed with suitably rated and ATEX / IECEx certified
blanking plugs.
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.
Flameproof
Lid Moulding
Flameproof
Chamber
External
Earth
Stud
Figure 1
M3 x 6mm
Grub Screw
Lid Moulding
Figure 2
O-Ring
