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U N I G E A R Z S 2 I N S TA L L AT I O N , O P E R AT I O N A N D M A I N TA I N A N C E I N S T R U C T I O N M A N U A L
•
Level the units and then bolt them together in
the front and rear part.
•
Carry out attachment by welding the outside
panels to the steel floor frame in the place
where the frame juts out from the switchgear
bottom, i.e. on the outside lateral walls of the
unit row. This method of installation is not
recommended if seismic resistance is
required.
•
In the case of a metal floor, use attachment
according to the figure. To make the holes,
use a drill with a suitable bit for the type of
fixing to be made (through or threaded hole).
5.8.4 Checking of foundation
Check the foundation with respect to the
foundation drawing supplied. The foundation
frame on which switchgears are to be installed
shall be properly leveled and level difference shall
be less than 2mm over a span of 1m. Level is to be
checked using an appropriate water level based
indicator. If pre- foundation is done with MS
channel or angles, use properly sized ISMC
channels with good quality cutting and
fabrication. Also ensure that all channels are
straight to maintain the future requirement of
surface level. Ensure the good quality
of welding and workmanship for fixing the
foundation frame. Refer Fig. 38.
5.8.5 Mounting of first cubicle on foundation
frame
Switchgear installation can be begun from any
one side of the switchboard. Remove
withdrawable parts from switchgear panels and
store them with suitable protection. As the
switchgear delivered from factory is pallet
mounted, it should be unloaded from the pallet
as close as possible to its foundation frame's
location to ensure minimal movement of
switchgear on the ground. From the ground, the
switchgear is to be gently pushed, manually,
on to its foundation frame.
If the use of crowbar is unavoidable, the crowbar
could be inserted either at sides or at rear of the
switchgear.
The crowbar shall never be used in the front side
of the switchgear. Please ensure that the
switchgear is vertical when mounted on its
frame. If necessary, use shims to make the
switchgear vertical. The first switchgear on the
frame is to be welded to its foundation frame
after the switchgear is properly mounted.
Every subsequent switchgear shall be pushed on
to its respective foundation frame and then be
installed; aligned and adjusted to the previous
one. Tighten the coupling M8x25 bolts between
adjacent switchgears; into the threaded holes
provided at their lateral sides. Remaining
switchgears shall be erected in the same way
as per the general arrangement drawing or
documents. As the final steps, after assembling
busbars in all switchgears mounted on their
foundation frames, weld all the switchgears to
their foundation frames. In case of switchboards
planned with more than 10 numbers of
switchgears, installation may also be begun from
the middle switchgear of the switchboard.
CAUTION!
Use proper personal protective
equipment like hand gloves, helmets
and etc., while handling switchgears.
5.8.6 Mounting of second, third and further
switchgear on the frame
Follow the procedure described in 5.2.2. when the
second switchgear is placed on the foundation,
it must be pushed as close as possible to the first
switchgear so that two switchgears touch each
other from top to bottom.
Do not weld other cubicles on frame till all
cubicles are erected and busbars are coupled.
—
Figure 38 - Hole positions to couple adjacent switchgears
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