VOLTAGEDROPCALCULATOR
AC Systems

277V Voltage DropCalculator

Calculate voltage drop for 277V commercial lighting and single-phase loads. NEC-compliant calculator for fluorescent, LED, and HID lighting systems.

AC Circuit Parameters

NEC Chapter 9 Table 9 values

Calculation Results

Pass
Voltage Drop
4.41V
1.59%
Voltage at Load
272.6V
of 277V source
Power Loss
48 W

Excellent - Meets NEC recommendations

277V Applications

  • •Commercial fluorescent lighting
  • •LED high-bay lighting
  • •HID lighting systems
  • •Commercial signage
  • •Warehouse lighting
  • •Parking garage lighting

AC Formula

Single Phase:
Vd = 2 × I × Z × L / 1000
Three Phase:
Vd = √3 × I × Z × L / 1000

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277V Voltage Drop Calculation Guide

About 277V Systems

277V AC systems are commonly used in industrial and commercial power distribution. Proper voltage drop calculations ensure equipment operates efficiently and safely within rated tolerances.

The NEC recommends limiting voltage drop to 3% for branch circuits and 5% total for the combination of feeder and branch circuit. For AC systems, this translates to a maximum drop of 8.3V for branch circuits.

Calculation Considerations

AC voltage drop calculations must account for both resistance and reactance of the conductors. The power factor of the load affects the effective impedance, making higher power factor loads more efficient from a voltage drop perspective.

For 277V systems, common wire sizes range from #10 AWG for light loads to 4/0 AWG for heavy feeders. Always verify ampacity requirements alongside voltage drop calculations.