⚡ Cu ρ (75°C): 0.0214 Ω·mm²/m 🔌 NEC / IEC Standards: NFPA 70 & IEC 60364 🇺🇸 US Grid Avg: $0.175/kWh 🇩🇪 DE Grid Avg: €0.345/kWh 🇸🇪 SE Elpris: 1.54 SEK/kWh 🇳🇴 NO Strøm: 1.17 NOK/kWh 🔩 Copper Ref: $9,650/t (2026-10-24)
🏭 Industrial Electrical Conversion · Three-Phase & Single-Phase

310 kVA to Amps at 480V Three-Phase AC (US Industrial)

Exact current (Amps), real power (kW), apparent power (kVA), mechanical horsepower (HP), breaker rating, and conductor size for 310 kVA on a 480V Three-Phase AC (US Industrial) circuit.

Line Current (0.85 PF)372.87 AAt 1.0 PF: 372.87 A
Active / Apparent Power263.5 kW310.0 kVA · 163.3 kVAR
Recommended Breaker500 A (NEC)400 A (IEC Nominal)
Recommended Copper Wire500 kcmilIEC Metric: 240 mm²

Engineering Breakdown for 310 kVA at 480V

Input Rating310 kVA (480V Three-Phase AC (US Industrial))
Amperage at 0.85 Power Factor (Industrial Motor/Transformer)372.87 Amps
Amperage at 1.00 Power Factor (Resistive Load)372.87 Amps
Real Power (kW / Watts)263.5 kW (263,500 W)
Apparent Power (kVA) & Reactive Power (kVAR)310.0 kVA / 163.3 kVAR
Equivalent Mechanical Horsepower (HP)353.36 HP
NEC 125% Continuous Circuit Breaker500 A
Minimum Copper Conductor (100 ft / 30 m, ≤3% Drop)500 kcmil (NEC) / 240 mm² (IEC)

Frequently Asked Questions

How many amps is 310 kVA at 480V (3-Phase)?

At 480V Three-Phase AC (US Industrial), 310 kVA equals 372.87 Amps at an industrial power factor of 0.85 (or 372.87 Amps at unity power factor 1.0).

What size breaker and wire is needed for 310 kVA at 480V?

For 372.87A continuous load, NEC requires a 125% rated breaker of 500A with 500 kcmil copper conductors, while IEC standard sizing uses a 400A breaker with 240 mm² copper cable.

Other Power Ratings & Voltages

5 kVA at 480V (3P)10 kVA at 480V (3P)15 kVA at 480V (3P)20 kVA at 480V (3P)25 kVA at 480V (3P)30 kVA at 480V (3P)45 kVA at 480V (3P)50 kVA at 480V (3P)75 kVA at 480V (3P)100 kVA at 480V (3P)150 kVA at 480V (3P)200 kVA at 480V (3P)250 kVA at 480V (3P)500 kVA at 480V (3P)310 kVA at 120V Single-Phase AC310 kVA at 208V Single-Phase AC310 kVA at 230V Single-Phase AC (IEC)310 kVA at 240V Single-Phase AC (NEC)310 kVA at 208V Three-Phase AC310 kVA at 230V Three-Phase AC310 kVA at 400V Three-Phase AC (IEC Europe)310 kVA at 415V Three-Phase AC (UK / AU)310 kVA at 600V Three-Phase AC (Canada / Heavy)310 kVA at 24V DC Direct Current310 kVA at 48V DC Battery / Telecom Bus