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Answer Posted / chirag jadav
Charger is a divice which convert A.C. into D.C. & Store in
bettery to use when main supply voltage not available.
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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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