Maximum demand equations
Category demand is calculated first and the overall simultaneity factor is then applied.
Pcategory = Pconnected × FdemandPmax = Fsim × Σ(Pcategory)I = Pmax / (√3 × VLL × pf)where:
- Pmax
- Maximum simultaneous active power[kW]
- Fdemand
- Category demand factor
- Fsim
- Overall simultaneity factor
Demand factors should come from project criteria, measured data, or applicable guidance.
How to use the Maximum Demand and Diversity Calculator
Combine lighting, socket, HVAC, motor, EV, and other loads with demand and simultaneity factors. Start by choosing the operating mode, then enter values from nameplates, measurements, or project documents in the units shown. The result updates immediately and keeps intermediate quantities visible for review.
- Confirm the system and calculation mode.
- Enter measured or manufacturer-rated values.
- Review the primary result and intermediate metrics.
- Continue with the related protection or equipment-selection checks.
Calculation method and validation
The equations and symbol definitions above show the complete calculation basis. Inputs are checked before calculation so zero, negative, incompatible, or physically impossible combinations are flagged instead of silently producing a misleading result.
How to interpret the result
Use the main result as a starting value and read every supporting metric. Balanced three-phase incomer Demand factors are project inputs, not universal prescribed values A passing or recommended result means the entered mathematical conditions are satisfied; it does not certify the complete installation or a particular product combination.
- Balanced three-phase incomer
- Demand factors are project inputs, not universal prescribed values
Selection limits and next checks
Preliminary engineering estimate only. Verify the final design against the current applicable standard, local rules, manufacturer data, and project conditions. Compare the output with the current applicable standard, local rules, exact VIOX product datasheet, environmental conditions, protection coordination, and the engineer's project requirements before procurement or installation.
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Assumptions
- Balanced three-phase incomer
- Demand factors are project inputs, not universal prescribed values
Important Warnings
- Preliminary engineering estimate only. Verify the final design against the current applicable standard, local rules, manufacturer data, and project conditions.