Siemens 8DA10 Series Installation And Operating Instructions Manual page 42

Installation
Construction of the floor
Earthing system
Cable basement
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The floor covering must be even, easy to clean, pressure-resistant, slip-resistant, abrasion-
resistant and electrically discharging.
As floor construction, the following is possible:
Steel girder layer
Suitable for large and numerous floor openings, and advantageous for later modifications or
extensions of the switchgear. The dimensions result from the constructional data of 8DA10
(see page 43, "Constructional data of the foundation").
Fig. 22: Frame construction with longitudinal girders
Fig. 23: Frame construction with longitudinal girders (cable basement)
Reinforced-concrete floor
Suitable for small room dimensions or spans, as well as for few and smaller floor openings.
Double floor
Suitable if neither a cable basement nor sufficient cable ducts can be installed; it consists of
removable, flame-retardant floor plates mounted on a supporting structure. The supporting
floor is about 100 cm to 60 cm lower depending on the cable routing (bending radius).
• Provide suitable earthing system for the substation building (e.g., foundation earth
electrode, ring earth electrode, earth rod), and prepare the associated 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).
• Always observe the associated national and international standards and building
regulations.
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.
The cable basement must have the following characteristics:
• Dry
• Accessible at any time
• Sufficiently illuminated
Revision 11 • INSTALLATION AND OPERATING INSTRUCTIONS • 8DA10 • 861-9601.9
NOTICE