208V Voltage DropCalculator
Calculate voltage drop for 208V three-phase commercial systems. NEC-compliant calculator for office buildings, retail, and light industrial applications.
AC Circuit Parameters
NEC Chapter 9 Table 9 values
Calculation Results
Excellent - Meets NEC recommendations
208V Applications
- •Commercial office buildings
- •Retail facilities
- •Light industrial equipment
- •Commercial HVAC systems
- •Data closets and server rooms
- •Commercial kitchen equipment
AC Formula
Other Calculators
208V Voltage Drop Calculation Guide
About 208V Systems
208V 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 6.2V 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 208V systems, common wire sizes range from #14 AWG for lighting to #6 AWG for appliances. Always verify ampacity requirements alongside voltage drop calculations.