Hi everyone,
I received earthing system design for the high rise building. Earthing system single line diagram shows main earthing system and separate earthing network as clean earth . In every IDF rooms (Telecom Room) there are earth bar and earth bars connected each other for every floors every IDF rooms and its connected in the end to the main clean earth bar in the main telecom room and main clean earth bar connected to the separate earth pits with earth electrodes. There are main earthing system as well but there is no connection between the main earthing system and clean earth. Earth pits ,earth electrodes,earth bars are all separate .The thing is telecommunication rack fed by the industrial socket inside the IDF Room and this sockets fed by UDB(UPS DB) in electrical room. UDB connected to the main earthing system within the earth bar inside the electrical room .Telecommunication rack cabinet body connected to the clean earth bar inside the IDF room. So after all separations between main earth and clean earth , they are connected through rack cabinet bonding. My question is what is the purpose of the "clean earth " provided in this design . And what I tried to explain above is correct practice?
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Clean Earth System
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To have two separate and unconnected earthing systems in the same building is not really permitted for safety according to BS 7671 in the UK (and other CENELEC national standards harmonized to HD 60364-series, and globally to IEC 60364-series). Whilst a separate functional earth system is permitted, it should be connected in at least one place (MET to MFET) - it cannot be otherwise, as the functional earthing system with its own electrodes is an extraneous-conductive-part.
However, usually in buildings with ICT systems, multiple bonding is provided between the protective and functional earthing systems. In general, the systems should follow BS EN 50310 (IEC 30129). This standard shows the multiple bonding between protective and functional earthing systems extending to power distribution units within racks themselves.
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To have two separate and unconnected earthing systems in the same building is not really permitted for safety according to BS 7671 in the UK (and other CENELEC national standards harmonized to HD 60364-series, and globally to IEC 60364-series). Whilst a separate functional earth system is permitted, it should be connected in at least one place (MET to MFET) - it cannot be otherwise, as the functional earthing system with its own electrodes is an extraneous-conductive-part.
However, usually in buildings with ICT systems, multiple bonding is provided between the protective and functional earthing systems. In general, the systems should follow BS EN 50310 (IEC 30129). This standard shows the multiple bonding between protective and functional earthing systems extending to power distribution units within racks themselves.
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