Check whether a power run holds up over distance and when to step up the cable size, before you roll it out. Updates live as you type.
Will your run hold up over distance?
Vdrop = 2 × length × I × ρ ÷ area (ρ copper = 0.0175 Ω·mm²/m). Aim for under 5%. If over, step up a gauge.
Check whether a power run holds up over distance and when to step up the cable size, before you roll it out. Updates live as you type.
Voltage drop equals 2 times the run length times the current times the resistivity of copper (0.0175 ohm-mm2/m), divided by the conductor area in mm2. The factor of 2 accounts for the current flowing out and back. Divide the drop by the supply voltage to get the percentage.
A common working target is to keep volt drop under about 5 percent of the supply voltage. Beyond that, sensitive gear can misbehave, motors lose torque and amplifiers lose headroom. If you are over, step up a cable gauge or shorten the run.
Yes. Voltage drop is inversely proportional to conductor area, so going from 2.5 mm2 to 4 mm2 cuts the drop by roughly a third for the same run. Over long distances the right gauge matters far more than the connector.
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