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Data Processing Equipotential

The manner in which components have evolved has meant that the assemblies which make up computers have become sensitive to high-frequency electromagnetic interference. For computers to operate correctly, it is important to limit high-frequency risks by the use of an equipotential earth circuit and cables screened by metal braids.

To protect persons and hardware, it is essential that the earth network corresponds to data processing requirements and complies with standards in force.

Pre-Requisites:

• Make sure that the value of the impedance measured at the earth connection complies with standards in force.
• If the building has several separate earth plates, they must be interconnected so as to eliminate the risk of different transient potential differences appearing in the same element of the installation.
• A single and equipotential earth circuit dedicated to the data processing system. The data processing equipotential wire, which is equivalent to the electric protection, should:
  • be of the HO7V-K multi-strand flexible type
  • be coloured black (noise-free neutral) and insulated along its entire length
  • have a cross-section of between 25 mm2 and 95 mm2 depending on the configuration installed. See "Earth circuit diagram for a TN-S point connection".

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