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NetworkIEC 60364-5-52 · Annex G

Voltage Drop Calculator

Single- and three-phase feeder voltage drop with conductor resistance at operating temperature, reactance and power factor — plus the smallest size that meets your limit.

1

Circuit

Supply and load

Supply

Line-line

2

Cable

Conductor and route

Conductor

70 PVC, 90 XLPE

EIT 3.6: 5 % total

3

Calculation Results

Voltage drop
2.62
%
OK ≤ 3 %
Voltage drop
10.49
V
Receiving end
389.5
V

Minimum Cu size within 3 %: 16 mm² (2.62 %).

Calculation BreakdownFactors, formula and table lookups
Factor b
√3
R at 70 °C
1.3760 Ω/km
X
0.08 Ω/km
cos φ / sin φ
0.85 / 0.5268
ΔV
10.49 V

Code Reference

Standards this calculation is based on

  • IEC 60364-5-52

    Annex G — ΔV = b·I·L·(R cosφ + X sinφ)

  • IEC 60228

    Class 2 conductor resistance at 20 °C, corrected to temperature

Always verify against the standard edition and utility requirements that apply to your project before issuing for construction.