How Many Amps Is 478 kW at 480V?

At 480V, 478 kW pulls approximately 676.41 amps on AC three-phase (PF 0.85). This is the case typical for commercial HVAC, industrial motors, rooftop units, and three-phase panel loads. Always verify against the equipment nameplate for actual install sizing.

478 kW at 480V, AC three-phase (PF 0.85)

676.41 Amps

478 kilowatts at 480V on AC three-phase ≈ 676.41 amps

AC Single Phase (PF 0.85)1,171.57 A

DC (ideal baseline)995.83 A

Try: 200kW at 480V 150kW at 480V 125kW at 480V 100kW at 480V

Volts

Amps (AC three-phase, PF 0.85)

676.41

Formulas

DC: kW to Amps

I_(A) = 1000 × P_(kW) ÷ V_(V)

1000 × 478 ÷ 480 = 478,000 ÷ 480 = 995.83 A

AC Single Phase (PF = 0.85)

I_(A) = 1000 × P_(kW) ÷ (PF × V_(V))

478,000 ÷ (0.85 × 480) = 478,000 ÷ 408 = 1,171.57 A

AC Three Phase (PF = 0.85)

I_(A) = 1000 × P_(kW) ÷ (√3 × PF × V_L-L), where V_L-L is the line-to-line voltage

478,000 ÷ (1.732 × 0.85 × 480) = 478,000 ÷ 706.66 = 676.41 A

Equipment & Circuit Sizing

Energy Cost

478 kW costs $81.26/hour at $0.17/kWh (rates last reviewed April 2026). See breakdown.

Power Factor Reference (AC three-phase)

How the line current for 478 kW at 480V changes with load power factor, on the same AC three-phase circuit basis the rest of the page uses. DC has no power factor; PF 1.0 represents resistive AC loads.

Load Type	PF	478 kW at 480V (AC three-phase)
Resistive (heaters, incandescent)	1	574.94 A
Fluorescent lamps	0.95	605.2 A
LED lighting	0.9	638.83 A
Synchronous motors	0.9	638.83 A
Typical mixed loads	0.85	676.41 A
Induction motors (full load)	0.8	718.68 A
Computers (without PFC)	0.65	884.53 A
Induction motors (no load)	0.35	1,642.7 A

AC Conversion Comparison

On DC, 478kW at 480V draws 995.83A. AC single-phase at PF 0.85 pulls 1,171.57A because reactive current is added on top of the real power. Three-phase at the same voltage needs only 676.41A per line since the same 478kW is shared across three conductors instead of one.

Circuit Type	Formula	Result
DC	478,000 ÷ 480	995.83 A
AC Single Phase (PF 0.85)	478,000 ÷ (0.85 × 480)	1,171.57 A
AC Three Phase (PF 0.85)	478,000 ÷ (1.732 × 0.85 × 480)	676.41 A

Other kW Values at 480V

kW	AC 3-Phase per line, PF 0.85	AC 1-Phase PF 0.85
15 kW	21.23 A	36.76 A
18 kW	25.47 A	44.12 A
20 kW	28.3 A	49.02 A
22 kW	31.13 A	53.92 A
25 kW	35.38 A	61.27 A
30 kW	42.45 A	73.53 A
35 kW	49.53 A	85.78 A
40 kW	56.6 A	98.04 A
50 kW	70.75 A	122.55 A
60 kW	84.9 A	147.06 A
75 kW	106.13 A	183.82 A
100 kW	141.51 A	245.1 A
125 kW	176.88 A	306.37 A
150 kW	212.26 A	367.65 A
200 kW	283.01 A	490.2 A

Same kW, Other Voltages

Each destination page leads with the interpretation most common for that voltage, so the amps shown below use the same basis as the page you'd land on: single-phase for residential voltages, three-phase for commercial/industrial panel voltages, DC for low-voltage.

electrical_services 478 kW at 208V = 1,560.94A (3-phase) electrical_services 478 kW at 400V = 811.69A (3-phase) electrical_services 478 kW at 460V = 705.81A (3-phase) electrical_services 478 kW at 575V = 564.65A (3-phase)

Related Calculations

bolt 478,000W to amps at 480V payments 478,000W running cost cable Wire size for 676.41A at 480V (3Φ)

Frequently Asked Questions

How many amps is 478 kW at 480V?expand_more

478 kW at 480V draws about 676.41 amps on an AC three-phase circuit at PF 0.85. Alternate cases at the same voltage: 995.83A on DC, 1,171.57A on AC single-phase.

Is 478 kW single-phase or three-phase?expand_more

478 kW is typically three-phase in commercial and industrial settings.

How does three-phase affect the amps for 478 kW?expand_more

Three-phase at 480V draws 676.41A per line versus 1,171.57A single-phase. Less current per conductor means smaller wire and lower I²R losses.

How many amps does a 478 kW EV charger draw at 480V?expand_more

480V is commercial/industrial panel voltage, not a typical AC EVSE feed to a vehicle. On three-phase 480V, 478 kW works out to about 676.41A per line (three-phase at PF 0.85). In practice, 400-480V three-phase is usually the AC input to a DC fast charger (50-350 kW CCS/NACS stations like Tesla Superchargers), which rectifies to DC and delivers that directly to the vehicle, rather than an AC EVSE connector. A 478 kW figure at 480V is most likely the AC feed to a smaller commercial cabinet or the control-side input of a larger DC fast charger, not an at-the-car AC current.

How much does 478 kW cost to run?expand_more

478 kW costs $81.26 per hour at $0.17/kWh (US residential average, last reviewed April 2026). At 8 hours/day that is $19,502.40 per month.

This calculator provides estimates for reference purposes only. Always consult a licensed electrician and verify compliance with the National Electrical Code (NEC) and local electrical codes before performing any electrical work.