27
After levelling the base irons, tighten bolts 13. The
adjusted position of the base irons on the concrete
floor must not be changed during this operation!
Check again and, ifnecessary, correct any
deviations;
Weld Individual parts of the base irons together
inside the “C" profile at the seams so that there is
a mutual conductive connection.
Take any necessary measures for perfect earthing
of the base irons with galvanized steel strips with
minimum dimensions of 30x4 mm. Two earthing
connections are recommended for a panel row
longer than approx. 5 panels;
When the floor top covering is applied, carefully
backfill the floor frame, leaving no gaps. The top
edge of floor frame should be 2mm above the
finished floor surface; the tolerance of this value is
within the limits of 0 to 5 mm. This facilitates
erection and alignment of the switchgear panels. In
some cases, this means that the material thickness
of an additional floor covering to be fitted later
must be taken into account separately;
The base irons must not be subjected to any
harmful impact or pressure, particularly during the
installation phase. If these conditions are not
respected, problems during assembly of the
switchgear and possibly with movement of the
withdrawable parts, as well as opening and closing
of the doors cannot be ruled out.
At tachment of the units to the “C" shape base
irons (see following figures)
The switchgear is attached to the base irons by means
of special bolt blocks, which can be supplied on
request.
Place the individual units of the switchgear in
successive steps onto correctly levelled and
installed base irons and level them according to
the relevant foundation drawings;
Level the units and then bolt them together in the
front and rear part;
To attach them to the base irons, insert specially
prepared bolt blocks in the fixing holes in the
bottom of the units and tighten them.
6.2.2. Method of installation B – Fixing with
anchoring bolts to concrete floor
The general foundation drawing is given in following
figures according to the parameters of the units.
Clean the switchgear installation area carefully.
On the slab, visibly trace the perimeter of all the
units making up the switchgear according to the
relevant drawing, taking the minimum wall and
obstacle clearances into account.
Level the floor both longitudinally and
transversally, evenness tolerance is •+/- 1 mm
over a measuring length of 1 m.
Drill the floor at the foreseen fixing points,
referring to the slab drilling drawings. To make the
holes, use a hammer drill with a bit according to
the steel plugs used.
Insert the plugs in the holes and put the individual
panels on the traced perimeters of the units to
create the switchgear.
Level the units and then bolt them together in the
front and rear part.
Fix the units with bolts with special washers (the
coupling material is supplied on request).
In the case of a metal floor, use the attachment
according to the figure (Figure 53), (Figure 54) To
make the holes, use a drill with a suitable bit for
the type of fixing to be made (through or threaded
hole).
6.2.3. Method of installation C – Fixing to a raised
false floor (Figure 55).
The general foundation drawing is given in following
figures according to the parameters of the units. In
most cases, the floating floor is created by means of a
steel structure in which the welded steel frame is
installed. A frame produced using suitable steel
profiles is used. ABB does not supply this frame.
Clean the installation area.
After installation of the frame, take any necessary
measures for perfect earthing of the frame with
galvanized steel strips with min. dimensions 30x4
mm. Two earthing connections are recommended
for a panel row longer than approx. 5 panels.
Place the units on the frame according to the
relevant foundation drawings, taking the minimum
wall and obstacle clearances into account.
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 (Figure 55). To make the
holes, use a drill with a suitable bit for the type of
fixing to be made (through or threaded hole).
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