European Safety Systems Ltd.
Impress House, Mansell Road, Acton, London W3 7QH
www.e2s.com
Tel: +44 (0)208 743 8880
Document No. D156-00-621-IS
Issue 1
27-10-22
Sheet 5 of 15
Figure 5: GNExB2 Entries and Terminal Block Location.
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
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.
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. The external earth conductor
should be at least 4mm2 in size.
7.3. Cable Glands, Blanking Elements & Adapters
Follow the minimum temperature ratings of cables and cable
glands according to the approvals applied.
ATEX / IECEx & UKEx Requirements
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
as follows:
Table 2: ATEX / IECEx & UKEx Min. Ratings of Cables &
Cable Glands.
NEC / CEC Requirements Only
For high ambient temperatures the cable entry
temperature may exceed 60ºC or the cable branching
point temperature may exceed 60ºC and therefore
suitable heat resisting cables and cable glands must be
used, with a rated service temperature at least as
stated below:
Table 3: NEC / CEC Min. Ratings of Cables & Cable Glands.
Cable Glands & Blanking Plugs
Appropriate cable glands to be customer supplied.
ATEX / IECEx & UKEx Requirements Only
The cable gland entries have an M20 x 1.5 entry
thread. Only suitably rated and ATEX / IECEx & UKEx
certified cable glands which must be suitable for the
type of cable being used and also meet the
requireme
nts of the current Ex ‘d’ flamepro
of installation
standards EN 60079-14 / IEC60079-14.
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.
When only one cable entry is used the other entries
must be closed with suitably rated and ATEX / IECEx &
UKEx certified blanking plugs.
NEC / CEC Requirements Only
The cable entries have an M20 x 1.5
–
6H entry thread.
If the installation is made using cable glands, only
suitably rated and certified cable glands must be used.
They must be suitable for the type of cable being used
and also meet the requirements of the current NEC /
CEC installation 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.
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.
Any unused cable entries must be closed with suitably
rated and certified blanking plugs.
