31
Figure 41: Example of 12/17.5 kV switchgear on foundation frame on concrete floor.
Panel with pressure relief to the outside.
A Panel depth
1) Minimum dimensions
2) The dimension must be verified according to the documentation of the relevant order
1 Operator aisle
6 Control cabinet (optional)
8 Opening for ventilation
9 Height of cable base - as required
10 Concrete - see also fig. 5/8
12 Opening for power cables
14 Door
16 Wall opening for pressure relief
17 Pressure relief duct
16 17 6 8
9
10
14
1
12
5.2.3 Method of installation C – Fixing to a raised false (Figure 42)
The general foundation drawing is given in figure 42 according to parameters of units. In most cases
the floating floor is created by steel structure in which the welded steel frame is installed. The frame
produced from 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 of min. dimensions 30x4mm. Two earthing connections are recommended
for the panel row longer than approx. 5 panels.
• Put 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 exceeds the switchgear bottom, this means 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 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 or threaded hole).
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