Samson 3963 Series, Mounting And Operating Instructions

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52 EB 3963 EN
Electrical connection
Selecting cables and wires
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Observe clause 12 of EN 60079-14:
2008 (VDE 0165, Part 1) for installation
of the intrinsically safe circuits.
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Clause 12.2.2.7 applies when running
multi-core cables and wires with more
than one intrinsically safe circuit.
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Preferably use connecting lines with mini -
mum 0.5 mm² conductor cross-section
and 6 to 12 mm outside diameter.
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Radial thickness of the insulation of a
conductor for common insulating materi-
als (e.g. polyethylene):
minimum
0.2 mm .
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Diameter of an individual wire in a
fine-stranded conductor: minimum
0.1 mm.
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Protect the conductor ends against splic -
ing, e.g. by using wire-end ferrules.
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Seal cable entries left unused with screw
plugs.
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For use in ambient temperatures below
–20 °C : use metal cable gland.
6.1 Switching amplifier ac-
cording to EN 60079-25
For operation of the solenoid valve, switch-
ing amplifiers must be connected in the out -
put circuit. They must comply with the limit
values of the output circuits.
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Observe the relevant regulations for in-
stallation in hazardous areas.
Equipment for use in zone 2
In equipment operated according to type of
protection Ex nA II (non-sparking equipment)
according to EN 60079-15: 2003:
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Circuits may be connected, interrupted
or switched while energized only during
installation, maintenance or repair.
6.2 Cable entry with cable
gland
The electrical connection is made using an
M20x1.5 cable gland to the terminals in the
enclosure or using a connector (see Fig. 12).
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The cable gland design depends on the
ambient temperature range. See techni-
cal data in section 3.2.
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When two separate cables are used for
connection, an additional cable gland
can be installed.