U0 - Nominal voltage, Ze - External earth loop impedance, Zs - Total earth loop impedance, R1 - Resistance of line conductor, R2 - Resistance of cpc, Rn - Resistance of neutral conductor, cpc - Circuit Protective Conductor, Ci - Rating factor for insulation, Cg - Rating rating factor for grouping, Cf - Rating factor for fuse, Ca - Rating factor for ambient temperature, Ib - Design current, In - Overcurrent device rating, It - Tabulated current-carrying capacity,

Unit 203 OnSite Guide Abbreviations

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