Installation
84/293 Revision 11 • INSTALLATION AND OPERATING INSTRUCTIONS • NXPLUS C • 802-9081.9
Earthing system • 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).
Cable basement
The cable basement must have the following characteristics:
• Dry
• Accessible at any time
• Sufficiently illuminated
12.2 Constructional data of 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.
• As for design and construction of the foundation, the relevant standards DIN 43661
“Fundamentschienen in Innenanlagen der Elektrotechnik” (Foundation rails in electrical
indoor installations) and DIN 18202 “Maßtoleranzen im Hochbau” (Blatt 3) (Measuring
tolerances in structural engineering (Sheet 3)) apply.
• Dimensions of the floor opening and the fixing points of the switchgear frame (see page 85,
"Floor openings and fixing points" and see page 110, "Fastening the panel to the
foundation").
Fig. 45: Double floor (example)
NOTICE
Incorrectly dimensioned cable basement
Can damage cables or cable connections.
➭ The cable basement must allow adequate space for connecting and laying the cables.
➭ Do not violate the minimum cable bending radius of the cables.
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