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Table C1 Domestic Maximum Demand Calculator

Calculate domestic maximum demand for dwellings and multi-unit scenarios using AS/NZS 3000 Table C1 logic.

Why this page matters

Calculate domestic maximum demand for dwellings and multi-unit scenarios using AS/NZS 3000 Table C1 logic. This static content is published so the canonical route has meaningful crawlable HTML even before the interactive application hydrates.

Who this page is for

Residential designers, electricians and consultants sizing domestic main supplies and consumer mains.

Relevant standards

  • AS/NZS 3000 Table C1

What this tool helps with

  • Estimate domestic maximum demand for single dwellings and multi-unit arrangements.
  • Include common residential loads such as cooking, hot water, air conditioning and EV charging.
  • Review demand outcomes before moving into cable sizing or voltage-drop checks.

Reviewed by

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

Frequently asked questions

What is AS/NZS 3000 Table C1 used for?

Table C1 in AS/NZS 3000:2018 provides the maximum demand calculation method for single-domestic and multi-domestic electrical installations, covering loads such as lighting, socket outlets, cooking, hot water, air conditioning and EV charging.

How is maximum demand calculated for a single dwelling?

For a single dwelling, sum the assessed demand for each load group in Table C1 (Column 1 for the first 20 A then Column 2 for the remainder), accounting for cooking appliances, water heaters, fixed space heating, motor loads, EV charging and socket outlets, then apply diversity per the table notes.

Does Table C1 include EV charging?

Yes. AS/NZS 3000:2018 Amendment 2 added explicit treatment of EV supply equipment in domestic installations. The ElecAS Table C1 calculator includes an EV charging input that follows the assessed demand rules.

What is the difference between Table C1 and Table C2?

Table C1 applies to domestic installations (single dwellings and multi-unit residential), while Table C2 applies to non-domestic installations such as offices, retail, industrial and hospitality. Use C3 (energy demand method) for floor-area-based assessments.

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