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  1. m3new

    why 4 ohm grounding

    here in uk we use 1.2metre rods for earthing (grounding),railway signalling equipment location cases .its an IT system ie.no return earth conductor, only means of earthing is local rods (max of 4 OHMS earth resistance).Our railway authoraties will not except chem rods ,just finished a 12 mile...

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