Stahl 8264 - EN 7.4 Internal Wiring; En en

167225 / 8264605300
2015-02-03·BA00·III·en·04
Mounting and installation
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Control and Distribution Panel in
flameproof enclosure
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7.4 Internal wiring
For instance, the following types are suitable for the temperature classes listed below:
Distances, creepage distances and clearances
• The creepage distances and clearances between the individual components as well
as between the components and the enclosure walls must be dimensioned sufficiently.
• The creepage distances between the components must be tested and observed
according to the specifications of the relevant operating instructions.
• At least the required clearance, which is the minimum distance between cover and
connection screw of the build-in components (with the conductor connected) must be
observed for all control panels.
Insulation test voltage
As regards insulation and separation of terminals and conductors observe the following:
• Insulation test voltage is calculated from the sum of the rated operational voltages of
intrinsically safe and non-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 (otherwise, doubled sum of the rated operational voltage of
intrinsically-safe circuits plus 1000 V).
DANGER
Explosion hazard due to incorrectly routed and damaged conductors!
Non-compliance results in severe or fatal injuries.
• Lay the conductors in such a way that damage
(e.g. due to bending, fraying) during operation is avoided.
• Adhere to the required creepage distances and clearances.
For the internal wiring use only conductors suitable for the operating
temperature range!
Type Temperature class Conductor cross-
section
H 05 G-K T5 )0.5 mm
2
, Cu
H 07 V-K T6
H 05 V-K T6
LIY T6
H 07 NSGAFÖU T5
or similar types