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Answer Posted / sathish
We can represents the IPXX is to IPX1X2.
IP means "Ingress Protection" and also the X1 is Protection
against solid objects X2 is protection against Liquid
objects.
for examble:
IP45
4 denotes protected against solid objects over 1mm tools,
wires & small wires
5 denotes protected against liquid objects over low
pressured of water from all direction
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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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