MASTER BOOK – SECTION 1 Rev. 2007 - EKA Group

1.5 – ELECTRICAL CHARACTERISTICS
This matter is very important for two reasons:
- personal safety
- the good functioning of the data processing equipment and other electro-sensible appliances
On the raised access floor surface, due to trampling friction, electrostatic charges be can generated, which could
be harmful to the people of for the functioning of the data processing equipment. The formation of such charges
is influenced by the air relative humidity, and increases with dry air in the room.
Therefore it is important that such electrostatic charges could dissipate from the top surface of the panels to the
building earth, or directly to the ground. For this reason several solutions can be chosen, depending on the
specific applicative requirements (conductive gluing or earth cables on a few spots for structures with stringers).
To eliminate the above illustrated phenomenon the raised access floor should normally have electrical resistance
values within the range min. 1.5 x 10 and max. 2 x 10 Ω
HOW TO MEASURE ELECTRICAL RESISTANCE
The panels to be tested are climated for 24 hours in a room with a temperature of 20°C and 50% relative
humidity. As per the above figure a voltage of 100 and/or 500 V is supplied between the upper covering and the
lower side of the panel. The electrical resistance is then measured by means of a suitable electrical device.
100 / 500 VOLT
TEXSAS INSTRUMENT
The possible classifications are:
Antistatic Offices, meeting rooms, halls, computer rooms 1 x 10 9 < R ≤ 2 x 10 10 Ω
Static-dissipative clean rooms 1 x 10 7 ≤ R ≤ 1 x 10 9 Ω
Conductive
Laboratories, control rooms, operating rooms,
explosive powder magazines
1.5 x 10 5 < R < 1 x 10 7 Ω
(*) As norm DIN 51953 and 54345 100 Volt; As UNI 10467-5 100 Volt; As NFPA 99 500 Volt.
Rev. 01.08.07
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