Unlike the —which is the sum of all device ratings—the maximum demand recognizes that not all devices operate simultaneously or at full capacity. Why Calculate Maximum Demand?
Electrical engineers and electricians use three primary methods to determine maximum demand. maximum demand calculation
Multiply the connected load by a diversity factor (e.g., 66% for domestic lighting) to account for the fact that not all appliances run at once. Aggregate & Phase Balance Unlike the —which is the sum of all
Organize loads into groups and subgroups as specified by applicable standards. For AS/NZS 3000, this involves identifying categories such as lighting, socket outlets, cooking appliances, air conditioning, and water heating. Multiply the connected load by a diversity factor (e
For a standard domestic or non-domestic installation, follow these steps:
By performing a maximum demand calculation, the design engineer can size the main incoming cable and protective switchgear for an 18.24 kW load instead of a 26.5 kW load. This saves significantly on material costs for copper cabling and distribution boards while maintaining safety margins. 5. Regulatory Variations and Global Standards