Method Of Installation A - Installation Of The Base Irons; Method Of Installation B - Fixing With Anchoring Bolts To Concrete Floor - ABB UniGear ZS1 Instruction Manual

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5.2.1 Method of installation A – Installation of the base irons:
The general foundation drawing is given in figures 39, 40 according to parameters of units.
• The base irons of "C" profile shape can be supplied by ABB manufacturer together with the
switchgear. Their installation is usually carried out by site personnel 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 holes for drilling in the place of prepared holes. Then drill the holes for
anchoring bolts i.e. for plugs 14 for fixing the base irons in the floor. Then put the plugs in the holes
and attach the base irons to the floor slightly with the bolts 13 without end tightening to make the
required levelling possible.
• Carefully level base irons both longitudinally and transversally over the entire length and to the
correct height by putting them under strips of suitable thickness and using a levelling instrument.
Tolerances for laying the floor frame are:
Evenness tolerance:
Straightness tolerance:
• After levelling of the base irons tighten the bolts 13. The adjusted position of the base irons on the
concrete floor must not be changed during this operation! Check again and if necessary correct
deviations;
• Weld Individual parts of the base irons inside "C" profile in the seams together so that the conductive
connection is mutually reached. In the version of intermittent base irons intended for the switch
disconnector panel with rated voltage 12/17.5kV (for 24 kV there is no intermittent base irons) figure
40 the individual base irons must be conductively connected by welding galvanized steel strips of
min. dimensions 30x4mm in the shape of loop. The connection strips must avoid the opening for
power cables so that they do not obstruct the cables;
• Take necessary measures for perfect earthing of the base irons with galvanized steel strips of
dimensions min. 30x4mm. Two earthing connections are recommended for the 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 5mm. 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 pressures, 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 units to the base irons of "C" shape (Figure 56)
The switchgear is attached to the base irons by means of special bolt blocks, which can be supplied
on request.
• Put individual units of 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 to base irons, insert specially prepared bolt blocks into the fixing holes in the bottom of
units and tighten.
5.2.2 Method of installation B – Fixing with anchoring bolts to concrete floor (Figure 55).
The general foundation drawing is given in figure 41 according to parameters of units.
• Clean the installation area of the switchgear 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 ± 1mm within a measuring
length of 1m;
• Drill the floor at the foreseen fixing points, referring to the slab drilling drawings. To make the holes,
use a hammer drill with the 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
creating 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 by request);
• In the case of a metal floor, use the attachment according to the figure (Figure 57 or 58) To make
the holes, use a drill with a suitable bit for the type of fixing to be made (through orthreaded hole).
± 1mm within a measuring length of 1m
1mm per 1m, but not more than 3mm over entire length of frame.