IT, TT, TN-S, TN-C-S, TN-C, Maximum Ze for TN-C-S - 0.35 Ω, Maximum Ze for TN-S - 0.8 Ω, Maximum Ze for TT Installation - 200 Ω, Maximum Ze for TT Transformer - 21 Ω, I in first letter relation of power system to earth - All live part isolated from earth , T in first letter relation of power system - Direct connection of transformer of one point to earth , T in second letter relation of power system - Direct electrical connection of exposed conductive part to earth , N in second letter relation of power system - Direct connection of exposed conductive part of the installation to the supply netral , S stand for in subsequent letter relation of power system - Protective function provided by a conductor separate from neutral , C in subsequent letter relation of power system system - Neutral and protective conductor combined ,
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