Factors such as grouping, thermal insulation, and ambient temperature can affect the ability of cables to carry the calculated load. Conclusion

Add up the results from each category to find the . 4. The Formula

Multiple large motors starting simultaneously create a high MD. Use star-delta starters, soft starters, or VFDs with sequential timers (delay start by 5-10 seconds). This lowers the 15-minute average significantly.

At its heart, Maximum Demand (MD) is the greatest average load (typically in kW or kVA) that an electrical installation draws during a specific time interval over a billing period. It's not the absolute highest instantaneous current, but the highest sustained demand, usually averaged over a 15, 30, or 60-minute window.

Sum the diversified currents calculated for each group to determine the total estimated peak current. Step 4: Determine the Final Service Rating

Engineers apply "diversity" (or demand factors) to reduce the total connected load to a realistic, diversified figure. For example, while a 10kW cooker draws over 40A, standard rules might only count the first 10A plus 30% of the remainder for the final calculation. The Three Methods of Discovery