200291 / 8220601300
2015-04-15·BA00·III·en·02
Mounting and installation
15
Control and Distribution Panels
Series 8220
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7.3.2 Open / close the enclosure without switch header.
Open the enclosure
Close the enclosure
7.3.3 Back-up fuse
• Secure the system by means of the specified electric back-up fuse.
• Ensure sufficient short-circuit current in the system.
7.3.4 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).
12174E00
• Unscrew the cover screw (1).
• Unscrew the cover by means of a handle (3).
• Observe the weight of the cover, if necessary,
use appropriate lifting tool.
• Place the cover carefully aside.
• Do not damage the cover thread!
16485E00
• Treat the cover thread with reducing lubricant
OKS 403 (exemption size .96 with Blasolube
300)
• Screw in the cover to the stop of the enclosure
cover stop screw (2).
• Press down the cover screw (1) and tighten it to
a torque of 5 ... 6 Nm.
• Do not modify joint faces: Not to be painted/
coated or processed. Do not place any seals on
joint faces.
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