Fastening Methods To Foundation - ABB MNS R Installation Manual

4.2.3

Fastening Methods to Foundation

The installation of switchboards equipped with cables entering form the bottom, requires a foundation
with an opening or a cable duct.
Compartments must be installed on a base frame which is:
• Embedded in the concrete floor
• Fixed on supports on a false floor.
To install the base frame, proceed as follows:
• The base frame should be aligned and checked by an ABB Sace qualified operator (on customer's
request).
• The frame must not exceed a horizontal tolerance of ±1 mm on a length of 1 m.
• The frame must not ondulate.
During the installation, the switchboard is welded or screwed to the base frame (see Figure).
• The welded joint length, on the front and rear sides of each cubicle, should not be less than 20 mm.
Each welding should be protected against corrosion by means of an adequate treating (a coat of paint).
• The screwed connection is carried out through the transverse section, using M10 screws. (see Figure).
If the switchboard is installed on false floors, proceed as follows:
• Tolerance is the same as in the case of a base frame.
• The subsoil must be solid, so that the tolerances are not exceeded by settling of the soil (especially
when using insulation layers and adhesives).
• The false floor must have a carrying capacity of p=20 kN/m
bottom).
2/1000
(compression load from the top to the
2
15
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