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Where double earthing is required? Is there any power
specification to have double earthing?
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Answer Posted / prabhakaran
Double earthing is provided for critical equipments like transformer and generator were the earthing is essential. when one earth connection is correded or ineffective the other one will provide the connection to earth. if only one earth connection is provided if connection is not good the system become undgrounded.
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When we have earthing mesh or underground earthing network in industrial plants, weather we have NT-S or NT-C-S kind of earthing system, so eventually weather we must use 4 or 5 wire in 400 volt level (For example 3×150+70 mm2 or 5×150 mm2) in this connection I would like to know exactly the paragraph of IEC or IEEE number
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