A familiar situation
Vergleichen Sie Leitungsquerschnitte für eine erste Gleichstrom-Planung anhand von Länge und Laststrom.
How to use this calculator
- Enter one-way cable length, current, conductor area and the remaining inputs.
- Select Calculate to see the answer and its breakdown.
- Keep a scenario, change an input and compare the results.
Use consistent units and check the assumptions below before applying the result.
How voltage drop is calculated
Estimate DC two-conductor cable voltage drop using conductor resistivity, length, and current. The round-trip length is twice the one-way run, and resistance scales with conductor area; this simplified model excludes connector resistance, temperature rise, AC reactance, and installation-code limits. A 10 m one-way copper run carrying 5 A through 1.5 mm² wire has about 1.17 V drop at 20°C. The calculation validates each input and keeps its stated units explicit. No. Check applicable electrical codes, ampacity, insulation, installation method, and temperature. This is an estimate for the stated assumptions; confirm measurements and any applicable professional or local standards before relying on it.
Vdrop = 2 × one-way length × current × resistivity ÷ conductor areaA 10 m one-way copper run carrying 5 A through 1.5 mm² wire has about 1.17 V drop at 20°C.
Assumptions & useful context
DC two-wire approximation at the entered resistivity.
Frequently asked questions
Does the result certify wire size?
No. Check applicable electrical codes, ampacity, insulation, installation method, and temperature.
Why is cable length doubled?
Current travels out and back in a two-wire DC circuit.