FREE TOOL · AS/NZS 3000 APPENDIX C METHOD
Maximum Demand Calculator
Estimate the maximum demand of a single domestic installation using the AS/NZS 3000 Appendix C load-group method, and see how the choice of heating plant changes the number.
Estimate only. Your licensed electrician or engineer verifies the demand factors and performs the final calculation for any installation
Supply
Nominal 230 V per phase. Three phase assumes a balanced spread.
A · Lighting 3 A first 20 pts, +2 A per 20
Count light points, including outdoor.
B · Socket outlets 10 A first 20, +5 A per 20
General purpose outlets and plug-in appliances up to 10 A.
C · Cooking 50% of connected load
Ranges, cooktops, ovens that are hard wired.
D · Space heating & cooling 75% of connected load
Enter the heat the home needs on a design day, then pick what delivers it and the water temperature it runs at. Geothermal figures are interpolated from Stiebel Eltron WPE-I performance data, and the tool picks the smallest unit that covers the load.
E · Water heating counted in group D
Pick how the home makes its hot water. This choice changes the demand more than most people expect.