Mounting and installation
14
240634 / 8146662300
2016-07-11·BA00·III·en·02
(Double) temperature controller and
limiter
Series 8146/5041, 8146/5051
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7.3.1 Back-up fuse
• Secure the system by means of the specified electric back-up fuse.
• Ensure sufficient short-circuit current in the system.
7.3.2 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
Risk of electric shock (short circuit) due to incorrectly dimensioned cables and
conductors!
Non-compliance can result in severe or fatal injuries.
• Run wires and cables with a minimum distance of 8 mm to wires and
cables of other intrinsically safe circuits.
• An isolating plate must be mounted between the connection points of
intrinsically safe and non-intrinsically safe circuits at a distance of up to
1.5 mm from the enclosure wall.
• A minimum distance or tight string length of 50 mm around an insulating
or earthed metal isolating plate must be provided between the
connection points of intrinsically-safe and non-intrinsically safe circuits.
• Use only insulated cables and conductors with a testing voltage of at
least 500 V AC and a minimum quality of H05.
• Make sure that the diameter of individual conductors/wires and
individual finely stranded conductors must not be smaller than 0.1 mm.
The conductors of intrinsically safe or non-intrinsically safe circuits are pro
-
tected by an earthed shield.
