EV charger circuit calculator
Tingnan ang mga EV charger para sa spare capacity, cable size at RCD.
Reads AS/NZS 3000:2018. Tables checked 1 Oct 2026.
Subukan ang isang job 9
Nilalagyan ng halimbawang value ang bawat job. Palitan ang mga ito ng sarili mong value.
- Charge an EV from a home socket‑outletThe circuit a mode 2 charging lead needs on a home socket‑outlet.
- Check spare capacity for an EV chargerWhether a 7 kW charger fits a 63 A board that already carries 40 A.
- Add EV chargers to an Australian car parkWhether four 22 kW chargers fit a 400 A board, with and without load management.
- Add a 22 kW charger to a houseThe cable, RCD and headroom for a three‑phase charger.
- Add a charger with load managementThe headroom when the charger is limited to 16 A.
- Add a second charger to a houseThe headroom with two 32 A chargers.
- Choose a charger RCD without d.c. detectionThe RCD type when the station has no 6 mA d.c. detection.
- Size a long charger runThe cable for a 32 A charger 40 m from the board.
- Add six chargers to an apartment car parkThe demand and supply for six chargers in New Zealand.
Mga input
Worked example gamit ang mga default na input.
- Bansa
- New Zealand · Clause 7.9
- Charging mode
- Mode 3
- Installation
- Pang-tahanang electrical installation
- Bilang ng charger
- 1
- Supply ng charger
- Single‑phase
- Rated current ng charger
- 32 A
- Supply ng board
- Single‑phase
- Rating ng main switch o supply
- 0 A
- Maximum demand nang walang charger
- 0 A
- Load management device
- Hindi
- Haba ng run
- 20 m
- Installation method
- Enclosed sa hangin
- Material
- Tanso
- Insulation
- PVC 75 °C
- Charger SDoC
- Hindi nakasaad
- Bersyon ng SDoC
- Hindi nakasaad
- Petsa ng SDoC
- Hindi nakasaad
- RCD na naka-install
- Hindi naitala
- Marking text ng RCD
- Hindi nakasaad
- Lokasyon ng RCD
- Hindi nakasaad
- Load control
- Hindi naitala
- Demand response
- Hindi naitala
Cable size
6mm²
- Spare capacity
- Hindi pa nasusuri
- Residual current device
- 30 mA Type B, hiwalay, sa bawat live conductor
- Demand ng charger
- 32A
- Pinakamababang kapasidad ng single-phase final subcircuit
- 32A
- Isolating switch
- 32A
- Mga clause na babasahin
- AS/NZS 3000:2018 Cl 7.9.3.3
Design aid lang ang resultang ito. I-verify ito laban sa kasalukuyang standard.
Mga hakbang ng kalkulasyon
- Clause na binasa para sa mga figure na ito7.9.3.3
AS/NZS 3000:2018 Cl 7.9.3.3
- Pinakamaliit na kapasidad ng single‑phase final subcircuit32A
AS/NZS 3000:2018 Cl 7.9.3.3
- Iba pang punto sa huling subcircuitWala, hindi sakop ng clause ang mga ito
AS/NZS 3000:2018 Cl 7.9.3.3
- Pinakamataas na rated residual current30mA
AS/NZS 3000:2018 Cl 7.9.3.3
- Uri ng residual current deviceB
AS/NZS 3000:2018 Cl 7.9.3.3
- Ayos ng residual current deviceHiwalay na device, sa bawat live conductor, kasama ang neutral
AS/NZS 3000:2018 Cl 7.9.3.3
- Alternatibong device sa ExceptionA with RDC-DD
AS/NZS 3000:2018 Cl 7.9.3.3
- Antas ng detection ng RDC-DD, mula sa NOTE6mA
AS/NZS 3000:2018 Cl 7.9.3.3
- Pinakamababang rating ng isolating switch32A
AS/NZS 3000:2018 Cl 7.9.3.3
- Pinakamababang taas mula sa sahig o lupa800mm
AS/NZS 3000:2018 Cl 7.9.3.3
- Mga charger na binilang sa pinakamabigat na phase1
- Bahagi ng rated current na binibilang100%
AS/NZS 3000:2018 Table C1 group (j)(iv)
- Demand ng charger sa pinakamabigat na phase32A
AS/NZS 3000:2018 Table C1 group (j)(iv)
- Design current ng cable32A
- Laki ng cableResulta6mm²
AS/NZS 3008.1.2:2017
- Voltage drop sa sukat na iyon2.09%
AS/NZS 3008.1.2:2017
Tungkol sa calculator na ito
How this is calculated
The tool checks an EV charger circuit. It reads Clause 7.9.3.3 of AS/NZS 3000:2018 for the circuit, the RCD and the isolating switch. It reads Table C1 for the charger demand. It then takes a cable size from the cable size calculator.
- Circuit rules. The tool prints the minimum final subcircuit capacity and the other points allowed on it. It also prints the isolating switch rating (Cl 7.9.3.3).
- RCD. It prints the maximum rated residual current, the type and the arrangement of the device. It also lists the Exception that allows a device with RDC-DD.
- Charger demand. It counts the chargers on the heaviest phase. It applies the share of rated current that group (j)(iv) of Table C1 counts. Load management can set a lower limit.
- Spare capacity. It subtracts your maximum demand from the supply rating. It then subtracts the charger demand.
- Cable. It takes the design current for the charger. It sizes the cable and gives the drop over your run.
| Step | Table or clause | What it decides |
|---|---|---|
| Circuit and switch | Cl 7.9.3.3 | The capacity, the points and the isolator |
| RCD | Cl 7.9.3.3 | The type, the rating and the arrangement |
| Charger demand | Table C1 group (j)(iv) | The current counted for each charger |
| Cable | AS/NZS 3008.1.2 | The size and the drop for the run |
Worked example
- 32 A Mode 3 charger on a 63 A supply with a 40 A demand. The charger is 20 m from the board. The tool finds the board short by 9 A. It gives a 6 mm² cable with a 2.09 % drop.
Limits
- The tool reads the clause and prints its figures. It is a pointer to the clause, not a ruling on a design.
- Clause 7.9 adds to Sections 2 to 7. A figure the tool does not report can still come from those Sections.
- The clause prints a capacity figure for single‑phase circuits only. It prints none for a three‑phase circuit.
- The RDC-DD level comes from a NOTE. A NOTE is not a requirement.
- The cable uses the default inputs of the cable size tool. Open that tool to set grouping or ambient.
- The tool reads the 2018 edition with Amendments 1, 2 and 3. It does not read the supply authority rules.
- The install record lists what to check and keep, with each source. You tick the rows. The tool judges none of them.
See also: Clause 7.9 and EV charging in NZ, EV charging load and spare capacity and EV charger spare capacity on a 63 A main switch.
Mga tanong
Design aid ang resulta. I-verify ito laban sa kasalukuyang standard.
Ano ang ginagawa ng EV charger tool?
Tinitingnan nito ang mga charger laban sa spare capacity sa board, ini-size ang cable at pinapangalanan ang residual current device. Sa New Zealand, binabasa nito ang AS/NZS 3000:2018 Clause 7.9. Para sa domestic Mode 2, idinadagdag nito ang 30 mA ng Clause 2.6.3.3.1, na pinananatiling may bisa ng Clause 7.9.1. Ang Clause 7.9.3.3 ay naglilimbag ng 32 A na capacity para sa single‑phase final subcircuits lang.
Paano gumagana ang spare-capacity check?
I-enter ang rating ng main switch at ang maximum demand nang walang charger, kada phase. Ang pagkakaiba ay ang spare capacity. Binibilang ng tool ang bawat charger sa rated current nito sa pinakamabigat na phase: Table C1 group (j)(iv) sa New Zealand home, Appendix P Paragraph P2 sa ibang lugar. Kapag may load management, ipinapakita nito ang managed case sa tabi ng unmanaged.
Ano ang binabasa ng tool para sa Australia?
Tumuturo ang Clause 2.2.1.4 sa Appendix P, na informative. Binabanggit ng Paragraph P4.1 ang 30 mA na device na hindi bababa sa Type A para sa bawat charging point. Nagdadagdag ang Mode 3 o Mode 4 outlet ng d.c. measure: Type B, o Type A na may 6 mA d.c. detection. Kapag ang charger mismo ang nakakadetect ng d.c. fault current, Type A ang susunod.
Aling residual current device figure ang iniuulat ng tool para sa Mode 3?
Ang mga iyon ay nasa Clause 7.9.3.3 at sa Exception nito. Itinatakda ng clause ang hiwalay na Type B device sa 30 mA sa bawat live conductor, kasama ang neutral. Para sa Mode 3, ang Exception ay nagbabanggit ng Type A na may RDC-DD bilang kapalit. Ang 6 mA RDC-DD figure ay nasa NOTE, hindi sa katawan ng clause. Minamarkahan ito ng tool bilang note.
Ruling ba ito kung sumusunod ang installation ko?
Hindi. Ang mga figure ng clause ay mga gabay sa clause number. Ikinukumpara ng spare capacity check ang mga figure na tina-type mo, at galing sa cable size tool ang cable. Binabasa ng lisensiyadong electrical worker ang mga clause at nagpapasya kung paano sila nalalapat sa trabahong nasa harap niya.
Mga clause at table na binabasa ng tool na ito
- AS/NZS 3000:2018 App P Para P2Maximum demand of charging points
- AS/NZS 3000:2018 App P Para P4.1Residual current devices for charging points
- AS/NZS 3000:2018 Cl 2.2.1.4Electric vehicle charging circuits
- AS/NZS 3000:2018 Cl 2.6.3.3.1Additional protection in New Zealand, residential
- AS/NZS 3000:2018 Cl 7.9.1Scope of Clause 7.9, electric vehicle supplies
- AS/NZS 3000:2018 Cl 7.9.2.1Source of supply for electric vehicle charging
- AS/NZS 3000:2018 Cl 7.9.2.2Socket‑outlets for Mode 1 charging
- AS/NZS 3000:2018 Cl 7.9.3.2Facilities for Mode 2 charging
Bawat clause at table, kasama kung paano ito na-verify
Huling na-check ang mga table noong 1 Oct 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
- RCD Selection calculatorCheck if an RCD is required and test the trip time.AS/NZS 3000Electricity (Safety) Regulations 2010
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