Stahl 8146/03, Operating Instructions Manual, Page: 32 / 41

Mounting and Installation
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137193 / 8146620300
2014-06-26·BA00·III·en·05
Control and Distribution Systems
Series 8146/5
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7.3.2 Back-up Fuse
• Secure the system by means of the specified electric back-up fuse.
• Ensure sufficient short-circuit current in the system.
7.3.3 Internal Wiring
Insulation test voltage
As regards the insulation and separation of terminals and conductors, note that the
insulation test voltage is derived from the sum of the rated operational voltages of
intrinsically-safe circuits.
"Intrinsically safe against earth"
In case of "intrinsically safe to earth", there is a minimum insulation voltage value of 500 V
(otherwise, double value of the rated operational voltage of intrinsically safe circuits).
"Intrinsically safe against non-intrinsically safe"
In case of "intrinsically safe against non-intrinsically safe" the insulation voltage value is
at least 1500 V (doubled sum of the rated operational voltage of intrinsically-safe circuits
plus 1000 V).
WARNING
Danger due to incorrectly installed cables and conductors!
Risk of injuries and material damage!
• Wires and cables must be at a minimum distance of 8 mm to wires
and cables of other intrinsically safe circuits.
• An isolating plate must be mounted between the intrinsically safe
and non-intrinsically safe circuits at a distance of
(
1.5 mm from
the enclosure wall.
• A distance or tight string length of 50 mm around an insulating
(
)
1 mm) or earthed metal (
)
0.45 mm) isolating plate must be
provided between the connection points of intrinsically-safe and
non-intrinsically safe circuits.
• Use only insulated cables and wires whose testing voltage is
AC 500 V and whose minimum quality is H05.
• The diameter of individual conductors must not be less than
0.1 mm.
• The diameter of individual wires of finely stranded conductors must
not be less than 0.1 mm.
The conductors of intrinsically safe or non-intrinsically safe circuits are
protected by an earthed shield.