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•
After levelling the base irons, tighten bolts.
The adjusted position of the base irons on the
concrete floor must not be changed during
this operation! Check again and, if necessary,
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
30 x 4 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 the floor frame should
be 2 mm 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.
Attachment of the units to the "C" shape base
irons
The switchgear is attached to the base irons by
special bolt blocks, which can be supplied on
request.
•
Place the individual units of the switchgear in
sequence 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.
5.8.2 Method of installation B – Fixing and
anchoring bolts to concrete floor
The general foundation drawing is given in
figures below 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 but not more
than 3 mm over the entire length of
switchboard.
•
Drill the floor at the intended 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, middle 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.(Fig-39)
To make the holes, use a drill with a suitable
bit for the type of fixing to be made
(through or threaded hole).
5.8.3 Method of installation C – fixing to raised
false floors
The general foundation drawing is given in
figures below according to the parameters of the
units. In most cases,the floating floor is created
by a steel structure in which the welded steel
frame is installed. A frame produced using
suitable steel profiles are used. ABB does not
supply this frame.
Evenness tolerance: ± 1 mm over a measuring
length of 1 m Straightness tolerance: 1 mm per 1m
•
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 30 x 4 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.
29
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