NEC Express 5800 User Manual page 22

If you do not know the load capacity of your flooring, consult your building
manager or an architect.
In many instances the equipment is installed directly on the existing floor and
interconnecting power cables are protected by cable covers.
In other instances, raised floors – that form a double floor – are used. Some
advantages of raised floors are:
Interconnecting cables can be routed under the raised floor.
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Floorboards can be easily removed to facilitate installation of cables.
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Adjustments can be made to air-conditioning ducts by cutting the floor as
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required.
The height of the raised floor must be no less than 14 inches (350 mm) — at
least 16 inches (400 mm) is recommended. The base floor must be dustproof to
prevent it from producing dust due to weathering and the floor covering material
should produce little dust.
If a raised floor is used, continuity must be provided between the floorboards
and support pillars. The insulation resistance between the floor surface and
support pillars must be within the range of 10
To prevent the build-up of static, an antistatic treatment can be applied to the
floor to keep its surface insulation resistance to at least 10
expose any metal directly to the floor.
When the surface insulation resistance is large, antistatic liquid can be applied
or an antistatic mat can be used to eliminate any static charge.
If you are going to install your system on a carpet in an ordinary business office,
use an antistatic carpet that produces little dust.
2-6 Planning Your Site
6 10
to 10 ohms.
6 10
to 10 ohms. Do not