Construction Data For The Foundation - Siemens NXPLUS C Installation And Operating Instructions Manual

Installation
Earthing system
Cable basement
Stipulations for evenness
and straightness
66/266
Reinforced-concrete plate
Suitable for small room dimensions or spans, as well as for few and smaller floor openings.
Double floor
A double floor is suitable if a cable basement is not available and not enough cable shafts can
be accommodated. The double floor consists of removable, flame-retardant floor plates
mounted on a supporting structure. The supporting floor is about 30 to 80 cm lower
depending on the cable routing (bending radius).
• Important: Observe the corresponding national and international standards and building
regulations.
• Provide effective earthing system for the substation building (e.g. foundation earth
electrode, ring earth electrode, earth rod). Provide for the corresponding earthing
connection points inside the substation building.
• Connect components brought into the substation building - such as metallic constructions,
floor reinforcement, doors, pressure relief systems, cable tracks, etc. - to the substation
earth, and earth them.
• Dimension the cross-sections of the earth electrodes sufficiently (e.g. foundation earth
electrode, ring earth electrode, earth rod).
Damage due to incorrectly dimensioned cable basement!
A too small cable basement can damage the connection cables or the switchgear.
➭ The cable basement must allow adequate space for connecting and laying the connection
cables.
➭ Do not violate the minimum cable bending radius of the cables.
The cable basement must have the following characteristics:
• Dry
• Accessible at all times
• Sufficiently illuminated
12.2

Construction data for the foundation

• A suitable foundation can be a false floor, a double floor or a reinforced-concrete
foundation. The reinforced-concrete floor must be equipped with foundation rails for
supporting the panels.
• For design and construction of the foundation, the relevant standards DIN 43661
"Foundation rails in electrical indoor installations" and DIN 18202 "Measuring tolerances in
structural engineering (Sheet 3)" apply.
• Dimensions of the floor opening and the fixing points of the switchgear frame (see page 67,
"Floor openings and fixing points" and see page 87, "Fastening the panel to the
foundation").
Evenness/straightness tolerance according to DIN 43661: 1 mm for 1 m length, 2 mm over
the width of the complete switchgear.
• Determine level differences between the installation surfaces of the panels using a
measuring sheet, and compensate with shims (0.5 - 1.0 mm).
Fig. 21: Measuring sheet for the foundation (example)
Revision 02 • INSTALLATION AND OPERATING INSTRUCTIONS • NXPLUS C • 806-9004.9
NOTICE