Advertisement
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
Both AC and DC sounder 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 figure 5).
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 between the two M5 stainless steel flat
washers, then reassemble the M5 spring washer and tighten
the M5 nut to ensure that the cable lug is secured against
loosening and twisting. The external earth conductor should be
2
at least 4mm
in size.
ATEX / IECEx & UKEx Requirements Only
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.
NEC / CEC Requirements Only
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 but at least a minimum of 0.82mm2 / 18AWG
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 Only
For high ambient temperatures the cable entry
temperature may exceed 70ºC or the cable branching
point temperature may exceed 80ºC and therefore
suitable heat resisting cables and cable glands must be
used, with a rated service temperature at least as stated
below:
Table 2: ATEX / IECEx & UKEx Min. Ratings of Cables &
Cable Glands.
E2S Warning Signals
Impress House, Mansell Road, Acton, London W3 7QH
Document No. D199-00-001-IS
Issue 7
13-05-22
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 entries have an M20 x 1.5 – 6H entry thread.
Only suitably rated and ATEX / IECEx & UKEx 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 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.
Any unused cable 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.
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
installation standards for NEC / CEC.
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.
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.
www.e2s.com
Tel: +44 (0)208 743 8880
Sheet 5 of 8
Advertisement
