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6. Assembly of the switchgear at site
Method of installation A – Installation on C
profile for concrete floor
The general foundation drawing is given in
following figures according to the parameters of
the panels.
• The “C" shaped base irons can be supplied by
ABB together with the switchgear. Their
installation is usually carried out by
personnel on site and should, if possible, be
performed under supervision of an ABB
specialist. The base irons must be installed in
the slab before finishing the floor
• Rest the irons in the specified position on the
concrete floor as shown in the relevant
foundation drawing and mark out the places
for drilling the holes. Then drill the holes for
anchoring bolts, i.e. for plugs for fixing the
base irons in the floor. Then put the plugs in
the holes and attach the base irons to the
floor loosely with bolts, without final
tightening so that any required levelling is
possible.
• Carefully level the base irons both
longitudinally and transversally over the
entire length and to the correct height by
putting strips of suitable thickness under
them and using a levelling instrument.
Tolerances for laying the floor frame are:
- Evenness tolerance ± 1 mm over a measuring
length of 1 m
- Straightness tolerance 1 mm per 1m
• 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 panels 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 panels of the switchgear
in sequence onto correctly levelled and
installed base irons and level them according
to the relevant foundation drawings.
• Level the panels 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 panels and tighten
them.
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