Line voltage and line-to-neutral voltage differ
For a balanced star-connected three-phase system with an applicable neutral arrangement, line voltage is approximately √3 times line-to-neutral voltage. For example, 400 V line voltage corresponds to about 230 V line-to-neutral. This relationship does not guarantee a suitable 230 V outlet on every 400 V generator: winding connections, neutral and output arrangements need confirmation.
Total three-phase capacity is not available on one phase
Check line voltage, frequency and phases for three-phase equipment, and phase-sequence requirements for motors. Single-phase loads supplied by a three-phase generator require review of distribution and permitted imbalance. Do not place the entire three-phase kVA on one phase or assume dividing total power by three proves suitability.
An illustrative current calculation
For balanced three-phase loads: I = kVA × 1000 ÷ (√3 × line voltage). At 100 kVA and 400 V, this is about 144 A. For single-phase loads: I = kVA × 1000 ÷ voltage; 100 kVA at 230 V is about 435 A. These are different system examples, not reconnection instructions or final cable, breaker or ATS sizing.
Prepare an electrical requirements list
List voltage, phases, Hz, input power or current and simultaneous operation for each load, including the single/three-phase mix. Share the site single-line diagram and neutral/earthing arrangements for review by the project electrical professional. Different voltage or single-phase output requires confirmation of available configuration, ratings and documentation.
Technical reference: Caterpillar — power conversion calculator