Selecting Cables And Wires; Conditions Concerning Connection - Samson 3965 Mounting And Operating Instructions

Mounting and start-up
5.3.1 Selecting cables and
wires
Î Observe clause 12 of EN 60079-14:
2008 (VDE 0165, Part 1) for installation
of the intrinsically safe circuits.
Î Clause 12.2.2.7 applies when running
multi-core cables and wires with more
than one intrinsically safe circuit.
Î Preferably use connecting lines with mini-
mum 0.5 mm² conductor cross-section
and 6 to 12 mm outside diameter.
Î Radial thickness of the insulation of a
conductor for common insulating materi-
als (e.g. polyethylene): minimum
0.2 mm.
Î Diameter of an individual wire in a
fine-stranded conductor: minimum
0.1 mm.
Î Protect the conductor ends against splic-
ing, e.g. by using wire-end ferrules.
Î Seal cable entries left unused with screw
plugs.
Î For use in ambient temperatures below
–20 °C: use metal cable gland.
5.3.2 Conditions concerning
connection
The specifications in the EC type examination
certificate PTB 05 ATEX 2044 X for zone 1
or 21 and the statement of conformity
PTB 06 ATEX 2003 X for zone 2 or 22 apply
for connection to intrinsically safe current
circuits (see pages 73 to 50).
34
Observe the correct polarity on connecting
DC voltage signals.
The electrical connection is made using sin-
gle connectors, a common cable with cable
gland or a multi-pole connector (see pag-
es 41 to 37).
Degree of protection
The devices are fitted with a vent plug (1) on
the left end plate (see Fig. 9).
The degree of protection IP 40 (according to
IEC 60529: 1989) is only guaranteed when
the vent plug is mounted and the connections
have been properly mounted.
Equipment for zone 2
In equipment operated according to type of
protection Ex nA II (non-sparking equipment)
according to EN 60079-15:2003, circuits
may be connected, interrupted or switched
while energized only during installation,
maintenance or repair.
Equipment with protection level 'ic' accord-
ing to EN 60079-11:2007 and equipment
connected to energy-limited circuits with type
of protection Ex nL (energy-limited equip-
ment) according to EN 60079-15:2003 may
be switched under normal operating condi-
tions.
The maximum permissible values specified in
the EC type examination certificates apply
when interconnecting equipment with protec-
tion level 'ic' and equipment operated ac-
cording to type of protection Ex nL IIC (see
page 71) and the statement of conformity
(see page 51).
EB 3965 EN