17
5 Installation
Careful and professional installation of the switch-
gear is one of the fundamental conditions of
trouble-free circuit-breaker operation.
• Install the mechanism enclosure in the panel
without tension or distortion, inserting dished
washers below the nuts or bolt heads at each of
the four mounting points (dependent on the
order).
• Connect the main terminals without any perma-
nent tension or pressure forces, exerted for
example by the conductor bars.
• When connecting the conductor bars, the bolts
must be inserted to the depth shown on the
dimensional drawing.
• Take account of any tested terminal zone.
• Use DIN bolts of tensile class 8.8, fastening
conductor bars together with dished washers.
• Make a short-circuit proof connection between
the PE conductor and the main earthing bar in
the switchgear, using contact washers.
• Remove any dirt. See also section 7.3.1.
Recommended
rated tightening torque
1)
Nm
Lubricant
2)
Thread size without Oil
(dry) or grease
M 6 10.5 4.5
M 8 26 10
M10 50 20
M12 86 40
M 16 200 80
1)
• Rated tigthening torques for fasteners without
ubrication are based on the thread friction coefficient
0.14 (the actual values of which are subject to
unavoidable, in some cases not insignificant, spread).
• Rated tigthening torques for fastener with lubrication
in accordance with DIN 43673.
2)
Thread and contact face of head lubricated.
Take account of any tightening torques which deviate
from the general table (e.g. for contact systems or device
terminals) as stated in the detailed technical documentation.
It is recommended that the threads or head contact
surfaces of the bolts be lightly oiled or greased, so as to
achieve a precisely defined rated tightening torque.
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