| Circuit / Load Type | Connected Load (W) / A | Assessment Rule (per standard) | Assessed Demand (W) | | :--- | :--- | :--- | :--- | | | 1,500 W | 100% of connected load | 1,500 W | | General Power Outlets (10 x 10A) | 10 outlets x 2,400W = 24,000 W | First 10A = 2,400W; Remaining 9 outlets x 50% = 10,800W | 13,200 W | | Refrigeration (2 fridges) | 1,200 W each (2,400W total) | Largest at 100% (1,200W), second at 50% (600W) | 1,800 W | | Microwave Oven | 1,500 W | 100% | 1,500 W | | Air Conditioner (split) | 3,500 W | 100% (only one) | 3,500 W | | Water Heater (under sink) | 2,400 W | 100% (or 0% if off-peak – assume peak) | 2,400 W | | Exhaust Fan | 300 W | 100% | 300 W | | Total Assessed Demand (Watts) | | | 24,200 W | | Divide by Voltage (230V) | | | 105.2 Amps | | Add 25% for future growth | | | ~131 Amps |
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A is a standardized reference matrix used by electrical engineers, designers, and electricians to determine the peak electrical load an installation will draw under normal operation. It forms the regulatory backbone of compliance books like the Australian/New Zealand Wiring Rules (AS/NZS 3000) and the British Standards (BS 7671) . max demand table
While specific methods vary by code, a typical table structure uses the following logic (common to AS/NZS 3000 – Australian/New Zealand Standard, which provides one of the most explicit "table" methods). | Circuit / Load Type | Connected Load
Manual spreadsheets are common, but professional tools include: Manual spreadsheets are common
: Provides the Energy Demand Method for non-domestic sites, often used for preliminary sizing based on floor area (