如何计算Cable Voltage Drop2
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Calculates voltage loss in electrical cables due to resistance. High losses reduce efficiency and can prevent motor starting.
公式
Formula: voltage drop = (2 × length × current × resistance) ÷ 1000
分步指南
- 1Current in amperes and cable length
- 2Wire gauge (affects resistance)
- 3Formula: voltage drop = (2 × length × current × resistance) ÷ 1000
- 4Typical target <3% for power, <5% for control
- 5Higher gauge wire reduces drop exponentially
例题解析
输入
100A, 50ft, 10 AWG
结果
3.2V drop
常见错误注意事项
- ✕Using undersized wire to save cost
- ✕Not accounting for temperature derating
常见问题
Why does voltage drop matter?
Reduces equipment voltage, increases losses, causes motors to start slowly, reduces efficiency.
How much does proper wire size cost vs. undersized?
Proper size costs 10-20% more initially but saves 5-10% energy costs over life.
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