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Symbols - General

C	capacitance [ F, μF]
C_min	minimim voltage factor ( = 0.95 )
f	frequency [Hz]
I_a	current causing operation of device in specified time, A
I_n	nominal current [A]
I_Δn	rated current of an RCD, A
L	inductance [ H, mH]
R	resistance [Ω]
R_A	sum of resistance of earth electrode and protective condcutor, Ω
U_LL , or V_LL	line to line voltage [V, kV]
U_LN or V_LN	line to neutral voltage [V, kV]
U_o or V_o	nominal line to neutral voltage [V, kV]
U_N or V_N	nominal line to line voltage [V, kV]
X	reactance, general [Ω]
X_c	capacitive reactance [Ω]
X_L	inductive reactance [Ω]
Z	impedance [Ω, Ω.m^-1]
Z₁	line conductor impedance, Ω
Z₂	circuit protective conductor (CPC) impedance, Ω
Z_e	external earth fault impedance, Ω
Z_s	earth fault look impedance, Ω
ω	angular frequency = 2πf, s^-1