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 4 of 5
Terminal Block Options Available
The STExJ2 can have two pre-fitted wire connectors: Terminal
Block Version or DIN Rail Version.
Figure 5: Terminal Block Version
–
STExJ2T01.
Figure 6: Terminal Block Version
–
STExJ2D01.
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.
Earthing
Junction box 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 (see figures 5 or 6).
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,
or to the bonded Earth terminals of DIN rail (see figure 6). 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.
6.3. Cable Glands, Blanking Elements & Adapters
For high ambient temperatures, the cable entry and the cable
branching point temperatures may exceed the following
temperatures:
•
For ATEX / IECEx: 70ºC at entry or 80ºC at branching point.
•
For NEC / CEC: 60ºC at entry or 60ºC at branching point.
Therefore, suitable heat resisting cables and cable glands
must be used with a rated service temperature at least as
stated in the Instructions document of the product being used.
Refer to STExB2 Xenon (D199-00-201-IS) and STExB2 LED
(D199-00-401-IS) Instructions.
Cable Glands
The cable gland entries have an M20 x 1.5 entry thread. Only
use suitably rated and certified cable glands, as per type of
approval, which must be suitable for the type of cable being
used and also meet the requirements of the current flameproof
installation standards (see section 6.1).
Blanking Plugs
When only one cable entry is used the other entries must be
closed with suitably rated and certified blanking plugs as per
type of approval.
Any unused cable entries must be closed with suitably rated
and certified blanking plugs.
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.
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.
For use in Class I Division II locations, in order to maintain the
db type protection, flameproof conduit seals and/or cable
glands must be used.
Adapters
The STExJ2 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 as per the
applicable standards.
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.
