When should I use Table C2 instead of Table C1?

Use Table C2 for non-domestic installations: offices, retail, factories, hotels, hospitals, schools and similar premises. Table C1 is only for domestic dwellings and multi-unit residential.

How does Table C2 handle diversity?

Table C2 applies diversity through assessed demand percentages on grouped loads — socket outlets, lighting, motors, cooking, hot water and HVAC are each assessed individually before summing the consumer mains demand.

Can Table C2 be used for mixed-use buildings?

For mixed domestic and non-domestic buildings, calculate each portion separately (Table C1 for domestic, Table C2 for non-domestic) and combine at the main switchboard with appropriate diversity, or use the Table C3 energy-demand method for the non-domestic portion.

What load groups does Table C2 cover?

Table C2 covers lighting, socket outlets, permanently connected appliances, cooking equipment, water heating, space heating and air conditioning, motor loads, and other specific loads with assessed demand factors per AS/NZS 3000.

What is the difference between Table C1 and Table C2 in AS/NZS 3000?

Table C1 applies to single and multiple dwellings using dwelling-count diversity. Table C2 applies to non-domestic installations (offices, retail, industrial, common services in unit blocks) using load-group diversity. A mixed-use building typically uses Table C1 for the residential submains and Table C2 for the non-residential portions, summed at the main switchboard.

Which loads belong in each Table C2 group?

Group A: lighting and general-purpose socket outlets. Group B: cooking appliances. Group C: water heating (storage, instantaneous, heat-pump). Group D: fixed air conditioning. Group E: motors (including kitchen exhaust, lift, pump motors). Group F: other specific loads (data centre, process, EV charging). The ElecAS C2 calculator labels each input with its Appendix C group.

Can I use Table C2 for a single-tenant office fit-out?

Yes. Table C2 is the correct table for any non-domestic installation including a single office tenancy. Enter the connected load per group and the calculator applies the published Table C2 diversity expressions.

Does Table C2 cover EV charging stations?

EV charging is handled under AS/NZS 3000:2018 Clause 2.2.2(c) on top of the Table C2 result. For larger charging hubs with a primary load-management system that caps simultaneous charging, the calculated demand may recognise that limit. For one or two AC chargers without load control, the full charger demand is added to the Table C2 result.

ElecAS

Table C2 Maximum Demand Calculator

Calculate non-domestic maximum demand using AS/NZS 3000 Table C2.

Why this page matters

Calculate non-domestic maximum demand using AS/NZS 3000 Table C2. This static content is published so the canonical route has meaningful crawlable HTML even before the interactive application hydrates.

Who this page is for

Commercial and industrial designers assessing demand for offices, retail, hospitality and mixed-use sites.

Relevant standards

AS/NZS 3000 Table C2

What this tool helps with

Work through non-domestic load groupings using Table C2 logic.
Handle offices, retail, hospitality, health and light industrial facilities.
Use the result as an input to downstream cable and protection design.

How to calculate maximum demand using AS/NZS 3000 Table C2

Identify the load groups — Sort each connected load into the matching Table C2 group: Group A (lighting + GPO), Group B (cooking), Group C (water heating), Group D (A/C), Group E (motors), Group F (other specific loads).
Enter the connected load per group — For each group enter the total connected load in kW or kVA. The calculator applies the per-group diversity expression from Table C2 automatically.
Pick the building type — Building type (office, retail, hotel, industrial, mixed-use) selects the correct Table C2 column and any building-specific row modifications.
Enter the phase configuration — Single-phase or three-phase consumer mains. For three-phase the per-group result is divided per phase as Table C2 specifies, accounting for any specifically single-phase loads.
Review the per-group contribution — The calculator shows each Table C2 group result, the diversity expression used and the total maximum demand. Export the branded PDF citing every row used.

AS/NZS 3000:2018 Table C2 — maximum demand for non-domestic installations

What Table C2 covers

AS/NZS 3000:2018 Appendix C Table C2 specifies the maximum demand calculation method for non-domestic installations: offices, retail, industrial, hotels, schools, hospitals, mixed-use common services, motel and dormitory buildings, and the common services submains in multiple-dwelling installations where the common services demand is non-trivial.

Unlike Table C1 which uses dwelling-count diversity, Table C2 uses load-grouping diversity. Loads are grouped (Group A: lighting and general purpose outlets; Group B: cooking; Group C: water heating; Group D: air conditioning; Group E: motors; etc.) and a per-group expression evaluates to a current in amperes per phase.

How load grouping differs from dwelling-count diversity

Table C2 recognises that a 5000 m² office will not draw all its lighting, cooking, water heating, A/C, motor and process loads simultaneously. Group A (lighting + GPO) might peak at 09:00, Group B (kitchen cooking) at 12:00, Group D (A/C) at 14:00 on a hot day. The per-group expressions encode realistic diversity for each load type.

Each group expression typically takes the first portion of the connected load at 100% and applies a diversity factor (often 0.5–0.75) to the remainder. The ElecAS C2 calculator implements every Table C2 group expression exactly as published.

Common Table C2 compliance traps

The most common error is treating a kitchen exhaust fan or a server room split-system A/C as a Group D (general A/C) load instead of a Group E (motor) load. Motors carry their own starting-current diversity and the per-row expression is different.

For high-load tenancies (e.g., commercial kitchens, data centres, industrial process loads) the Table C2 result must be sanity-checked against a load-survey or kWh-recording. AS/NZS 3000 Clause 2.2 allows the use of recorded data via Table C3 for existing installations being extended; for greenfield, the Table C2 expressions are the regulatory baseline.

Reviewed by

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

Frequently asked questions

When should I use Table C2 instead of Table C1?: Use Table C2 for non-domestic installations: offices, retail, factories, hotels, hospitals, schools and similar premises. Table C1 is only for domestic dwellings and multi-unit residential.
How does Table C2 handle diversity?: Table C2 applies diversity through assessed demand percentages on grouped loads — socket outlets, lighting, motors, cooking, hot water and HVAC are each assessed individually before summing the consumer mains demand.
Can Table C2 be used for mixed-use buildings?: For mixed domestic and non-domestic buildings, calculate each portion separately (Table C1 for domestic, Table C2 for non-domestic) and combine at the main switchboard with appropriate diversity, or use the Table C3 energy-demand method for the non-domestic portion.
What load groups does Table C2 cover?: Table C2 covers lighting, socket outlets, permanently connected appliances, cooking equipment, water heating, space heating and air conditioning, motor loads, and other specific loads with assessed demand factors per AS/NZS 3000.
What is the difference between Table C1 and Table C2 in AS/NZS 3000?: Table C1 applies to single and multiple dwellings using dwelling-count diversity. Table C2 applies to non-domestic installations (offices, retail, industrial, common services in unit blocks) using load-group diversity. A mixed-use building typically uses Table C1 for the residential submains and Table C2 for the non-residential portions, summed at the main switchboard.
Which loads belong in each Table C2 group?: Group A: lighting and general-purpose socket outlets. Group B: cooking appliances. Group C: water heating (storage, instantaneous, heat-pump). Group D: fixed air conditioning. Group E: motors (including kitchen exhaust, lift, pump motors). Group F: other specific loads (data centre, process, EV charging). The ElecAS C2 calculator labels each input with its Appendix C group.
Can I use Table C2 for a single-tenant office fit-out?: Yes. Table C2 is the correct table for any non-domestic installation including a single office tenancy. Enter the connected load per group and the calculator applies the published Table C2 diversity expressions.
Does Table C2 cover EV charging stations?: EV charging is handled under AS/NZS 3000:2018 Clause 2.2.2(c) on top of the Table C2 result. For larger charging hubs with a primary load-management system that caps simultaneous charging, the calculated demand may recognise that limit. For one or two AC chargers without load control, the full charger demand is added to the Table C2 result.