E2S GNExJ2 User manual

_______________________________________________________________________________________________________________________________
European Safety Systems Ltd. Impress House, Mansell Road, Acton, London W3 7QH [email protected] Tel: [phone]
www.e-2-s.com Fax: [phone]
Document No.D156-00-501-IS Issue 1 11-12-15 Sheet 1 of 3
INSTRUCTION MANUAL (ATEX / IECEx)
GNExJ2 Flameproo Junction Box
For use in Flamma ble Gas and Dust Atmospheres
1) Introduction
The GNExJ2 is a flameproof junction box which is certified to
meet the requirements of the ATEX directive 94/9/EC and the
IECEx scheme. The junction box can be used in hazardous
areas where potentially flammable gas and dust atmospheres
may be present. The GNExJ2 can be used in Zone 1 and
Zone 2 areas with gases in groups IIA, IIB and IIC and
Temperature Classifications of T1, T2, T3, T4, T5 and T6.
The unit can be used in Zone 21 and Zone 22 with dusts in
groups IIIA, IIIB and IIIC and Temperature Classifications of
T1, T2, T3, T4, T5 and T6.
2) Marking
All units have a rating label, which carries the following
important information:-
Unit Type No. GNExJ2
Max. Voltage: 60Vdc / 260Vac 50/60Hz
Max Power Dissipation: 5W
Codes:
Ex db IIC Gb T6 Ta -50°C to +70°C
Ex tb IIIC Db T80°C Ta -50°C to +70°C
Certificate No. DEMKO 15ATEX1448X
IECEx UL15.0003X
“Warnings”
POTENTIAL ELECTROSTATIC CHARGING HAZARD
DO NOT OPEN WHEN AN EXPLOSIVE
ATMOSPHERE IS PRESENT
ALL ENTRIES M20 X 1.5
IF TEMPERATURE EXCEEDS 70ºC AT ENTRY OR 80ºC AT
BRANCHING POINT USE SUITABLE RATED CABLE AND CABLE
GLANDS
3) Type Approval Standards
The junction box has an EC Type examination certificate
issued by UL and have been approved to the following
standards:-
EN60079-0:2012 / IEC60079-0:2011 (Ed 6): Explosive Atmospheres
- Equipment. General requirements
EN60079-1:2014 / IEC60079-1:2014 (Ed 7): Explosive Atmospheres
- Equipment protection by flameproof enclosures "d"
BS EN 60079-31:2014 / IEC 60079-31:2013 (Ed 2): Explosive
Atmospheres - Equipment dust ignition protection by enclosure "t"
4) Installation Requirements
The junction box must only be installed by suitably qualified
personnel in accordance with the latest issues of the relevant
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
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 GNExJ2 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.
5) Zones, Gas Group, Category, IP Rating and
Temperature Classification
The units can be installed in locations with the following
conditions:-
Area Classification Gas:
Zone 1 Explosive gas air mixture likely to occur in
normal operation.
Zone 2 Explosive gas air mixture not likely to occur,
and if it does, it will only exist for a short time.
Gas Groupings:
Group IIA Propane
Group IIB Ethylene
Group IIC Hydrogen and Acetylene
Temperature Classification:
T1 450
o
C
T2 300
o
C
T3 200
o
C
T4 135
o
C
T5 100
o
C
T6 85
o
C
Area Classification Dust:
Zone 21 Explosive dust air mixture likely to occur in
normal operation.
Zone 22 Explosive dust air mixture not likely to occur, and
if it does, it will only exist for a short time.
Dust Groupings:
Group IIIA Combustible Flyings
Group IIIB Non-conductive Dust
Group IIIC Conductive Dust
IP Rating: IP6X to EN/IEC60079-0 and IP66 to EN/IEC60529
0518
I
I 2G
II 2D
Epsilon x
Equipment Group and
Category:
CE Marking
Notified Body No.

_______________________________________________________________________________________________________________________________
European Safety Systems Ltd. Impress House, Mansell Road, Acton, London W3 7QH sa[email protected]m Tel: [phone]
www.e-2-s.com Fax: [phone]
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
exceed +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

_______________________________________________________________________________________________________________________________
European Safety Systems Ltd. Impress House, Mansell Road, Acton, London W3 7QH sa[email protected]m Tel: [phone]
www.e-2-s.com Fax: [phone]
Document No. D156-00-501-IS Issue 1 11-12-15 Sheet 3 of 3
12-way
Terminal block
(Labeled 1-12)
External Earth
Stud
Internal Earth
Stud
M20 x 1.5
Entries
M20 x 1.5
Entries
12-off
Standard DIN rails
(Labelled 1-12)
4-off
Bonded Earth
DIN rails
(Labelled 13-16)
External Earth
Stud
Internal Earth
Stud
12) Cable Connections
Terminal Block Version (GNExJ2T01)
The cable connections are made into the terminal block in the
flameproof enclosure. See section 7 of this manual for access
to the flameproof enclosure.
DIN Rail Version (GNExJ2D01)
The cable connections are made into the DIN Rail in the
flameproof enclosure. See section 7 of this manual for access
to the flameproof enclosure.
Wires having a cross sectional area of up 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. 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.
Internal earthing connections should be made to the terminal
connections in terminal block or bonded Earth terminals of
DIN rail (see figure 5). 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 M4
earth stud, using a ring crimp terminal to secure the earth
conductor to the earth stud between the two M4 stainless
steel flat washers, then reassemble the M4 spring washer
and tighten the M4 nut to ensure that the cable lug is secured
against loosening and twisting. The external earth conductor
should be at least 4mm2in size.
13) 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.
Electrostatic charging hazard - Clean only with a damp cloth.
14)Adapter Options
The GNEx Junctino Box 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.
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.
15) Special Conditions of safe use
The enclosure is non-conducting and may generate an
ignition-capable level of electrostatic charges under certain
extreme conditions. The user should ensure that the
equipment is not installed in a location where it may be
subjected to external conditions that might cause a build-up
of electrostatic charges on non-conducting surfaces.
Figure 4
Figure 5