ElecAS

Maximum Demand Calculators

Choose Table C1, Table C2 or Table C3 maximum demand workflows for Australian electrical design calculations.

Why this page matters

Choose Table C1, Table C2 or Table C3 maximum demand workflows for Australian electrical design calculations. This static content is published so the canonical route has meaningful crawlable HTML even before the interactive application hydrates.

Who this page is for

Users selecting the correct maximum demand method for domestic, non-domestic and energy-demand projects.

Relevant standards

  • AS/NZS 3000 Table C1
  • AS/NZS 3000 Table C2
  • AS/NZS 3000 Table C3

What this tool helps with

  • Compare the three common maximum demand methods from one hub.
  • Choose the path that matches domestic, non-domestic or energy-demand inputs.
  • Move directly into the specific calculator needed for the installation.

Reviewed by

Wisam Tozah — Associate Electrical Engineer. B.Eng (Electrical), MIEAust, CPEng, NER, NSW DBP, NSW PRE, APEC, IntPE(Aus). LinkedIn.

Frequently asked questions

Which AS/NZS 3000 maximum demand method should I use?

Use Table C1 for domestic dwellings and multi-unit residential, Table C2 for non-domestic installations with itemised loads, and Table C3 (energy-demand method) when floor-area and occupancy categories give a more reliable estimate than load itemisation.

Is the maximum demand calculation mandatory?

AS/NZS 3000:2018 Clause 2.2.2 requires that the maximum demand of every consumer's installation be assessed before sizing consumer mains, switchboards and submains. The Appendix C tables are the deemed-to-comply methods.

Can I add EV charging and battery loads to maximum demand?

Yes. AS/NZS 3000 Amendment 2 added explicit assessment rules for EV supply equipment, and battery storage loads must be included according to manufacturer continuous ratings. The ElecAS calculators include EV inputs in C1 and C2.

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