Floor area demand calculator
I-estimate ang commercial demand mula sa floor area at gamit.
Reads AS/NZS 3000:2018. Tables checked 1 Oct 2026.
Subukan ang isang job 4
Nilalagyan ng halimbawang value ang bawat job. Palitan ang mga ito ng sarili mong value.
- Estimate demand for a shop by floor areaThe demand of a 600 m² shop with airconditioning, from Table C3.
- Estimate demand for a warehouseA 3000 m² warehouse with ventilation and 40 kVA of special equipment.
- Estimate demand for a basement carparkA 4000 m² basement carpark with EV charging on a quarter of it.
- Estimate demand for an office floorAn 800 m² office with reverse cycle air, at the top of the range.
Mga input
Worked example gamit ang mga default na input.
- Mga phase
- Three phase
- Phase voltage
- 230 V
- Figure mula sa table
- Nakalimbag na average
- Mga area
- 2 row
- Espesyal na kagamitan
- 0 kVA
Pinakamataas na demand kada phase
217.39A
- Kabuuang demand
- 150kVA
- Offices · Light and power
- 75kVA
- Offices · Airconditioning, zonal reheat
- 75kVA
Design aid lang ang resultang ito. I-verify ito laban sa kasalukuyang standard.
Mga hakbang ng kalkulasyon
- Kinuha ang figure mula sa Table C3Naka-print na average
AS/NZS 3000:2018 Table C3
- Offices · Light and power, energy demand50VA/m²
AS/NZS 3000:2018 Table C3
- Offices · Light and power, 1500 m²75kVA
AS/NZS 3000:2018 Table C3
- Offices · Airconditioning, zonal reheat, energy demand50VA/m²
AS/NZS 3000:2018 Table C3
- Offices · Airconditioning, zonal reheat, 1500 m²75kVA
AS/NZS 3000:2018 Table C3
- Total demand150kVA
AS/NZS 3000:2018 App C Para C2.4.3
- Current bawat phase, kVA ÷ (3 × phase voltage)Resulta217.39A
AS/NZS 3000:2018 App C Para C2.4.3
Tungkol sa calculator na ito
How this is calculated
The tool estimates the maximum demand of a commercial or light-industrial building from its floor area. It uses the energy demand method in AS/NZS 3000:2018 App C Para C2.4.3. It reads the VA per square metre from Table C3.
- Pick the figure. For each area, choose an occupancy and a use. The tool takes the printed average, or the low or high end of the printed range (Table C3). You can type your own figure instead.
- Work out each area. The tool multiplies the area by the VA per square metre and divides by 1000. The result is kVA.
- Add EV charging. The NOTE to Table C3 puts EV charging on top of all other energy demands. The tool adds the carpark EV rows to the total.
- Add special equipment. Table C3 prints no figure for it. You enter its kVA from the load details, and the tool adds it.
- Total demand. The tool adds every area and the special equipment (Para C2.4.3).
- Current. On one phase, the tool divides the kVA by the phase voltage. On three phases, it divides by 3 times the phase voltage. That gives the current in each phase.
| Step | Table or clause | What it decides |
|---|---|---|
| Figure per area | Table C3 | The VA per square metre for each use |
| EV charging | NOTE to Table C3 | The charging load added on top |
| Total demand | App C Para C2.4.3 | The sum of the areas and special equipment |
| Current | App C Para C2.4.3 | The demand in amps on each phase |
Worked example
- Small retail and office building with basement EV charging. Shops of 600 m² at 70 VA/m² for light and power and 30 VA/m² for air conditioning. Offices of 400 m² at 50 and 25 VA/m². A basement carpark of 300 m² at 15 VA/m², plus its EV charging at 20 VA/m². The total demand is 100.5 kVA. The current is 145.65 A per phase at 230 V.
- The Paragraph C2.4.3.2 case. 1500 m² of office at 50 + 50 VA/m². The total demand is 150 kVA. The current is 217.39 A per phase.
Limits
- Table C3 is for commercial and light-industrial buildings. It is not for homes. Use Table C1 for a home.
- The figures depend on the climate, the hours of use, energy management and how evenly the load spreads.
- The per phase figure assumes an even spread over three phases. Check the heaviest phase where the load is uneven.
- The tool uses the phase voltage. On a 230/400 V supply, enter 230.
- Special equipment has no printed figure. You must know its kVA. The tool does not guess it.
- An own figure outside the printed range gives a warning. Check it before you rely on it.
- To work from a list of loads, use the Table C2 method in the Maximum Demand tool.
See also: The energy demand method and Table C3, Shop and office maximum demand by floor area and the Maximum Demand tool.
Mga tanong
Design aid ang resulta. I-verify ito laban sa kasalukuyang standard.
Kailan ko gagamitin ang Table C3 sa halip na Table C2?
Angkop ang Table C3 sa commercial o light-industrial na gusali sa maagang yugto ng design, kapag alam mo ang floor area at ang gamit pero hindi pa ang mga load. Kailangan ng Table C2 ang load group. Kapag alam na ang mga load, tingnan ang demand gamit ang Table C2.
Aling figure ang dapat kong kunin sa range?
Nagbubukas ang tool sa nakalimbag na average. Sinasabi ng standard na nakadepende ang mga figure sa klima, sa oras, sa energy management, at kung gaano kapantay ang pagkalat ng load. Kunin ang mataas na dulo para sa mainit na klima o mahabang oras, o maglagay ng sarili mong figure.
Paano ginagawang amps ng tool ang kVA?
Hinahati nito ang kabuuang VA sa phase voltage. Sa tatlong phase, hinahati ito sa tatlong beses ng phase voltage, kaya ang 150 kVA sa 230 V ay nagbibigay ng 217.39 A kada phase. Tugma ito sa halimbawa sa Paragraph C2.4.3.2.
Kasama ba ang EV charging sa figure ng carpark?
Hindi. Inililista ng Table C3 ang EV charging bilang sariling row sa ilalim ng open air at basement carpark, at ang NOTE nito ay naglalagay nito bilang dagdag sa lahat ng iba pang demand. Idagdag ang EV charging area sa tabi ng carpark area.
Paano naman ang special equipment sa warehouse o workshop?
Walang figure na nakalimbag sa Table C3 para sa special equipment. Kalkulahin ito mula sa detalye ng load at ilagay sa kVA. Idinadagdag ito ng tool sa kabuuan.
Mga clause at table na binabasa ng tool na ito
- AS/NZS 3000:2018 App C Para C2.4.3Energy demand method for commercial installations
- AS/NZS 3000:2018 Table C3Maximum demand, energy demand method for non‑domestic installations
Bawat clause at table, kasama kung paano ito na-verify
Huling na-check ang mga table noong 1 Oct 2026.
Mga kaugnay na tool
- Maximum demand calculatorEstimate maximum demand for domestic or non‑domestic loads.AS/NZS 3000 Table C1/C2
- Maximum demand per phase calculatorSpread the load over three phases and see the imbalance.AS/NZS 3000
- Spare capacity calculatorSee if a new load fits the main switch of a supply.AS/NZS 3000 Cl 2.2.2
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