Installation And Mounting Of The Breaker - ABB VM1 Manual

M E D I U M V O LTA G E P R O D U C T S
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5. Installation and mounting of the breaker

Careful and professional installation of the
switchgear is one of the fundamental conditions
of trouble-free circuit breaker operation.
• Install the mechanism enclosure in the panel
without distortion, placing a dished washer under
the nut and bolt head at each of the four mounting
points (depending on the order).
• Connect the main terminals without any residual
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.
• Observe the tested terminal zone where
appropriate.
• Use DIN bolts of tensile class 8.8 together with
dished washers to fasten the conductor bars.
• Only use the tightening torques shown in the
following table.
• Remove any contamination (see also section 7.3.1.)
Thread
Without (dry)
M 6
10 .5
M 8
26
M 1 0
50
M 1 2
86
M16
200
1 ) The rated tightening torques for fasteners without lubrication are based
on a coefficient of friction for the thread of 0.14 (the actual values are
subject to an unavoidable, partly not inconsiderable, spread).
Rated tightening torques for fasteners with lubrication in accordance with
DIN 43 673.
2 ) Thread and head contact surface lubricated.
Any tightening torques which deviate from those in the general table (e.g.
for contact systems or device terminals) are to be taken into account as
stated in the detailed technical documentation. It is recommended that
the threads and head contact surfaces of the bolts should be lightly oiled
or greased, so as to achieve a precise rated tightening torque.
11 11
Recommended
tightening torque )
1
Nm
Lubricant )
2
Oil or grease
4.5
10
20
40
80