The 3 figures quoted are for the resistance, reactance and impedance components of the volts drop.Without the need for complex maths you can use the largest figure which give you a worst case scenario.
Yes the quoted values are based on normalised values of 1 for current and unit length i.e per amp per meter - this equates to 18milli - ohms per meter of resistance for a 2.5mm^2 from the table....
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