Our Voltimum Experts answer your questions on a daily basis in our Technical Expertise area. This one, concerning IT server rooms, and whether it is necessary to make a clean earth for them, is answered by SELECT:
Answer: A clean earth is not a defined term in BS 7671. However, IEE Guidance Note 8 'Earthing and Bonding' states that a clean earth is a particular form of functional earthing necessary for the proper functioning of electrical equipment(usually IT or telecoms).
It is a low noise earth in which the level of conducted or induced interference from external sources does not produce an unacceptable incidence of equipment malfunction.
It is recommended that equipment manufacturers own recommendations should be taken for such installation work. IEE Guidance Note 8 provides some limited information on the topic.
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