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Emerson DeltaV VE4033S2B1 KJ3222X1-BA1 new original product
The international standard IEC 60364 distinguishes three families of earthing arrangements, using the two-letter codes TN, TT and IT.
The first letter indicates the connection between earth and the power-supply equipment (generator or transformer):
T: direct connection of a point with earth (Latin: terra)
I: no point is connected with earth (insulation),
except perhaps via a high impendance
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