Maximum Demand Calculation May 2026

3,000W (Diversity 100% of first 10A + 30% of rest) ≈ 1,800W Total Calculated Demand: 7,120W

In electrical engineering, "Maximum Demand" is the highest amount of electrical power used over a specific period (usually 15, 30, or 60 minutes). Calculating this accurately is critical for designing safe, efficient, and cost-effective electrical systems.

You rarely turn on every light, appliance, and motor in a building at the exact same time. Maximum demand calculation relies on two key principles: maximum demand calculation

For a simple calculation of Current (Amps) in a single-phase system: For a three-phase system:

Add up the results from each category to find the . 4. The Formula 3,000W (Diversity 100% of first 10A + 30%

Consult your local electrical code (e.g., Table A1 in BS 7671) for diversity guidelines.

Always allow for a 10–20% margin for future expansion (e.g., adding an EV charger or solar battery). Maximum demand calculation relies on two key principles:

Example: For domestic lighting, you might apply a diversity factor of . This means you assume only two-thirds of the lights will be on at once during peak times.