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Description
Depending on the type of computer, it may be necessary to install a raised floor.
If so, a raised floor of "data processing quality", the technical
characteristics of which comply with standard NF P67.103-1 and -2 April 1993, is required.
The raised floor should support a load of 500 da N/m² and a temporary load of 2.5 kN.
- The slabs consist of galvanized steel or aluminium trays, in which panels of high
density wood particles are glued, and which are covered with stratified flooring or vinyl.
- Their volume resistance lies between 104 and 1010 ohms.
This design makes it possible to:
- spread the overall load of the machines
- avoid the need to lay a cableway for data and electric cables, which would obstruct free
movement in the room
- correct differences of surface evenness in the primary floor
- install the various elements of the computer in a more functional manner
- use the space under the floor (plenum space) for circulating the conditioned air.
The raised floor is made up of 60 cm x 60 cm square slabs, that are removable
and interchangeable and supported by adjustable actuators (self bearing assembly) equipped
with conducting rubber pads. The structure may, if necessary, be reinforced by
intermediary crossbeams or longitudinal girders (T assembly), depending on the cut of the
slabs and the hardware load.
If an air-conditioning unit or units are placed on brackets in the room, these air
conditioning equipment supports must be isolated electrically from the slabs, crossbeams
and actuators of the raised floor.
Structure of a raised floor
Raised floor sectional drawing
The structure of the raised floor (at the bottom of the actuators) should be meshed by
means of a flat tin-plated braided copper wire with a cross-section of at least 20 mm²
(see "Raised
floor equipotential bonding principle").
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