Wire gauge
By current and allowed voltage drop: minimum cross-section + losses over length
Parameters
Recommended cross-section
Power loss: 44,8 Вт
4 мм²
- By current (6 A/mm²)
- 2,67 мм²
- By voltage drop
- 1,62 мм²
- Actual drop
- 2.80 В (1.2%)
Copper: 6 A/mm² is a conservative density for continuous load in conduit. S ≥ 2·ρ·L·I/ΔV. For 12 V lines drop matters more than heating: 0.5 V on 12 V is 4% and watts lost in the cable.