Circuit loading calculator
Bilangin ang mga point na kayang dalhin ng final subcircuit.
Reads AS/NZS 3000:2018. Tables checked 27 Sept 2026.
Subukan ang isang job 6
Nilalagyan ng halimbawang value ang bawat job. Palitan ang mga ito ng sarili mong value.
- Load a control panelThe load on each circuit in the panel.
- Count sockets on a house circuitThe loading of twelve 10 A socket‑outlets on a 20 A circuit.
- Count lights on a circuitThe loading of thirty lighting points on a 10 A circuit.
- Load a kitchen circuit with a hobThe demand of a 7.2 kW hob on its circuit.
- Load an office socket circuitThe loading of eight 10 A socket‑outlets on a 20 A office circuit.
- Apply diversity upstreamThe loading of a submain that feeds six circuits.
Mga input
Worked example gamit ang mga default na input.
- Rating ng circuit-breaker
- 20 A
- Cable size
- 2.5 mm²
- Installation
- Domestic
- Mga lighting point
- 0
- 10 A socket-outlet
- 8
- 15 A socket-outlet
- 0
- 20 A socket-outlet
- 0
- Fixed o stationary na load
- 0 A
- Isama ang cooking appliance
- Hindi
- Ilapat ang upstream diversity
- Hindi
Kabuuan ng mga kontribusyon
8A
- Rating ng circuit-breaker
- 20A
Design aid lang ang resultang ito. I-verify ito laban sa kasalukuyang standard.
Mga hakbang ng kalkulasyon
- Mga lighting point0A
AS/NZS 3000:2018 Table C9
- 10 A socket‑outlets8A
AS/NZS 3000:2018 Table C9
- 15 A socket‑outlets0A
AS/NZS 3000:2018 Table C9
- 20 A socket‑outlets0A
AS/NZS 3000:2018 Table C9
- Nakapirming at hindi gumagalaw na load0A
AS/NZS 3000:2018 Table C9
- Kabuuan ng mga kontribusyonResulta8A
AS/NZS 3000:2018 Table C9
- Rating ng circuit-breaker20A
AS/NZS 3000:2018 Table C9
Tungkol sa calculator na ito
How this is calculated
The tool counts the points a final subcircuit can carry. It reads AS/NZS 3000:2018 Table C9. You enter the breaker rating, the cable size and the points on the circuit.
- Lighting points. Each point adds the current that Table C9 gives for a lighting point.
- Socket‑outlets. The tool counts 10 A, 15 A and 20 A socket‑outlets. Each group has its own contribution in Table C9.
- Fixed and stationary load. You enter the rated current of fixed loads. The tool adds it in full.
- Cooking and diversity. If you turn them on, the tool adds the cooking demand and applies the diversity for upstream devices.
- Sum of contributions. The tool adds all contributions.
- Check. It compares the sum with the breaker rating. The pair of cable size and device rating must also be one that Table C9 lists.
| Step | Table or clause | What it decides |
|---|---|---|
| Point contributions | AS/NZS 3000:2018 Table C9 | The current each point counts for |
| Sum | Table C9 | The total counted load |
| Pair | Table C9 | Whether the cable and device are listed together |
Worked example
- Eight 10 A socket‑outlets on a 20 A circuit. The cable is 2.5 mm² in a domestic installation. The sum of contributions is 8 A. That is within the 20 A breaker rating, so the tool passes the circuit.
Limits
The tool fails a circuit when the sum is over the rating. It warns when Table C9 does not pair the cable with the device. It also fails a cooking range that the table does not permit.
It counts points. It does not check the voltage drop or the loop impedance. Use the cable size calculator for those.
See also: Maximum demand with Table C1 and C2, What size breaker for 4 mm² cable and the maximum demand tool.
Mga tanong
Design aid ang resulta. I-verify ito laban sa kasalukuyang standard.
Ano ang ginagawa ng circuit loading tool?
Dinadagdag ng tool ang contribution ng bawat point sa final subcircuit. Ang lighting point ay 0.5 A bawat isa. Ang 10 A socket ay 2 A kapag non‑domestic na installation na walang air conditioning, o 1 A kung hindi. Hindi dapat lumampas ang kabuuan sa rating ng circuit-breaker.
Aling mga table ang ginagamit nito?
Galing ang contribution sa AS/NZS 3000:2018 Table C9. Galing ang cooking demand sa Table C5. Galing ang upstream diversity factor sa Table C4. Galing ang cable at device pair sa parehong Table C9 row.
Ilang socket‑outlet ang puwede kong ilagay sa 20 amp circuit?
Sa domestic installation, ang bawat 10 A na socket ay binibilang na 1 A. Kaya 20 socket ang aabot sa rating ng 20 A device. Kapag ang non‑domestic installation ay walang permanent air conditioning, ang bawat socket ay binibilang na 2 A. Kaya 10 socket ang aabot sa parehong rating.
Mga clause at table na binabasa ng tool na ito
- AS/NZS 3000:2018 App C Para C2.5Demand on a final subcircuit
- AS/NZS 3000:2018 Table C4Upstream circuit loading after diversity
- AS/NZS 3000:2018 Table C5Maximum demand for domestic cooking appliances
- AS/NZS 3000:2018 Table C9Loading of points per final subcircuit
Bawat clause at table, kasama kung paano ito na-verify
Huling na-check ang mga table noong 27 Sept 2026.
Mga kaugnay na tool
- Cable size calculatorFind the smallest cable size that passes each check.AS/NZS 3008.1.2AS/NZS 3008.1.1AS/NZS 3000
- Maximum demand calculatorEstimate maximum demand for domestic or non‑domestic loads.AS/NZS 3000 Table C1/C2
- Wet area zones checkerFind the Section 6 zone, IP and RCD near water.AS/NZS 3000
Nakatulong ba ito?
May tanong, o may value na mukhang mali? Makipag-ugnayan sa amin.