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5. Erection of the switchgear on site
In the interests of the best possible erection sequence, and to ensure a high-
quality standard, local installation of the switchgear should only be carried out
by specially trained skilled personnel, or at least responsibly managed and
supervised.
5.1 General site
requirements
At the start of erection,
•
The switchgear room at site must be
completely, finished
•
Provided with lighting and power for the
installation work
•
Room shall be lockable and dry, and with good
ventilation facilities
•
All the necessary preparations such as wall
openings, ducts, etc. for laying of the power
and control cables must be completed
•
The celling must be high enough for assembly
of pressure relief duct
•
It must be ensured that the conditions for
indoor switchgear to IEC62271-1 etc., with
temperature class "minus 5 indoor "are
complied with
5.2 Foundation
The switchgear can be erected on a foundation
frame embedded in the switch room floor, on a
raised false floor, on a cable duct, in a
pre-fabricated concrete substation or if
necessary, directly on to the switch room floor.
Wherever there is requirement of cable box for
additional cable termination height, care must be
taken for proper accommodation of the cable
box below panel.
5.2.1 Checking of foundation
Check the foundation with respect to foundation
drawing supplied. The foundation frame on which
switchgears are to be installed shall be properly
leveled and level difference shall be less than
2 mm. Level is to be checked using an appropriate
water level-based indicator. Ensure the good
quality of welding and workmanship for fixing the
foundation frame.
Make all necessary arrangements for effective
earthing of the foundation frame with 40 X 4 mm
galvanized steel strip. Two connections are
necessary for relatively long switchgear.
5.2.2 Mounting of cubicle on
foundation frame
As the switchgear delivered from factory is pallet
mounted, it should be unloaded from pallet
as close as possible to its foundation frame's
location to ensure minimal movement of
switchgear on the ground. Please ensure that the
switchgear is vertical when mounted on its frame.
If necessary, use shims to make the switchgear
vertical. Once desired position of switchgear on
foundation frame is reached, switchgear on the
frame is to be welded to its foundation frame.
5.3 Erection of the panels
Figures 4.1-4.4
Use screws of tensile class 8.8. The tightening
torques for the screw connections with dished
washers are as follows:
Recommended tightening
torque
Thread
Lubricant
Without
M 6
10.5
M 8
26
M 10
50
M 12
86
M 16
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).
2)
Rated tightening torques for fasteners with lubrication in
accordance with DIN 43 673.
3)
Thread and head contact surface lubricated.
Take account of any tightening torques which
deviate from the general table as stated in the
detailed technical documentation.
21
Nm
1)2)
3)
Oil or grease
4.5
10
20
40
80
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