Mounting and Installation
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2019-02-19·BA00·III·en·04
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Control Unit System
Series ConSig 7040
Intrinsically safe circuits
Comply with the following conditions when setting up intrinsically safe electric circuits:
• In intrinsically safe circuits, only insulated conductors with a test voltage of at least
500 V AC and a minimum quality of H05 may be used.
• The diameter of individual conductors must not be less than 0.1 mm;
this also applies to the individual wires of finely stranded conductors.
• With regard to the insulation and separation of terminals and conductors, note that the
insulation test voltage is determined from the sum of the rated operational voltages of
intrinsically safe and non-intrinsically safe circuits.
• In case of "intrinsically safe to earth", there is a minimum rated insulation voltage value
of 500 V (otherwise, double the value of the rated operational voltage of intrinsically
safe circuits).
• In the case of "intrinsically safe to non-intrinsically safe", there is a minimum rated
insulation voltage value of 1500 V (otherwise double the rated operational voltage plus
1000 V).
• The electric lines for Ex "i" electric circuits must be run at least 8 mm away from the
conductors of other intrinsically safe circuits. The only exception is the wiring method
by which the cores of the intrinsically safe or the non-intrinsically safe circuit are
surrounded by an earthed shield.
The pre-conditions for the distance between parts to be connected for intrinsically safe
and non-intrinsically safe circuits are:
• A distance of 50 mm around an insulating (
)
1 mm thick) or earthed metal
(
)
0.45 mm thick) isolating plate or
• An isolating plate which is separated from enclosure walls by a distance of
(
1.5 mm.
Summary of Contents for ConSig 7040 Series
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