Installation
12
143457 / 826560300010
2010-04-26·BA00·III·en·02
Light-metal Ex d enclosures /
flameproof enclosure 8265
Intrinsically safe circuits
Insulation test voltage
With regard to the insulation and separation of terminals and cables, it should be noted
that the insulation test voltage is derived from the sum of the rated operating voltages of
intrinsically safe circuits.
"Intrinsically safe against earth"
In case of "intrinsically safe against earth" then the insulation voltage value is at least 500
V (or double the value of the intrinsically safe circuit rated operational voltage).
“Intrinsically safe against non intrinsically safe“
In case of "intrinsically safe against non-intrinsically safe", then the insulation voltage
value is at least 1500 V (double the sum of the rated operational voltage of
intrinsically-safe circuits plus 1000 V).
Terminal blocks in Ex e terminal compartment
WARNING
Danger due to incorrectly dimensioned cables and wires!
Z
Risk of severe injuries.
X
Use only insulated cables and wires whose testing voltage is AC 500V and
whose minimum quality is H05.
X
The diameter of one conductor must not be smaller than 0.1 mm.
X
The diameter of individual wires of finely stranded conductors must not be
smaller than 0.1 mm.
WARNING
Danger due to incorrectly routed cables and wires!
Z
Risk of short circuit.
X
Wires and cables must be at a minimum distance of 8 mm to wires and
cables of other intrinsically safe circuits.
Exception
: The cores of
intrinsically safe or non-intrinsically safe circuits are protected by an
earthed shield.
)
A distance of 50 mm around an insulating (
)
1 mm thick) or earthed metal
(
)
0.45 mm thick) isolating plate must be provided between the connection
points of intrinsically safe and non-intrinsically safe circuits.
An isolating plate at a distance of
(
1.5 mm to the enclosure wall must be
provided between the connection points of intrinsically safe and non-
intrinsically safe circuits.
)
Pay attention to the test certificate of the terminals.
Only one conductor may be connected to each terminal. Terminal bridging is
only permitted if original I.S. accessories have been used.
Equip with the necessary partitions as needed.
For additional protection against splaying use crimped wire-end sleeves or
cable lugs.
The cross section of the splay protection must meet the conductor cross
section.
Summary of Contents for GUBox 8265/0 Series
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