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Voltage Drop
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Voltage Drop Percentage
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Load Voltage
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Power Loss
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Voltage drop is the reduction in electrical potential (voltage) that occurs when current flows through a wire's resistance. It's important because excessive voltage drop can cause equipment to operate inefficiently or fail, and can indicate undersized wiring.
The National Electrical Code (NEC) recommends a maximum voltage drop of 3% for branch circuits and 5% total for feeders plus branch circuits. For example, on a 120V circuit, 3% would be 3.6V.
Voltage drop is calculated using the formula: V_drop = 2 × I × R × L, where I is current in amps, R is resistance per foot, and L is length in feet. The factor of 2 accounts for the round-trip distance through both conductors.
Yes, conductor material significantly affects voltage drop. Copper has lower resistance than aluminum, so copper wire will have less voltage drop for the same gauge and length. Aluminum requires larger wire sizes to achieve the same voltage drop as copper.
Higher temperatures increase wire resistance, which increases voltage drop. Wire ratings at 60°C, 75°C, and 90°C reflect different insulation types and their maximum safe operating temperatures.
Three-phase circuits have a factor of √3 (1.732) in the calculation, making voltage drop lower than equivalent single-phase circuits. This is why three-phase power is preferred for large loads.
You can reduce voltage drop by: using larger wire gauge, choosing copper over aluminum, shortening wire runs, reducing load current, or using higher voltage systems. The most common solution is increasing wire size.