RCD Selection calculator
Tingnan kung kailangan ng RCD at subukan ang trip time.
Reads Electricity (Safety) Regulations 2010 and AS/NZS 3000:2018. Tables checked 27 Sept 2026.
Subukan ang isang job 8
Nilalagyan ng halimbawang value ang bawat job. Palitan ang mga ito ng sarili mong value.
- Choose the RCD for an EV chargerThe RCD a 32 A home EV charger circuit needs in NZ.
- Check the RCD for house lightingThe RCD a lighting circuit needs in Australia.
- Check the RCD for a classroomThe RCD rule for socket‑outlets in a school.
- Check the RCD for a child-care centreThe 10 mA rule where young children are.
- Check a measured RCD trip timeWhether 28 ms at rated current and 12 ms at five times pass.
- Choose the RCD for a patient areaThe residual current and times for a patient-protection RCD.
- Choose the RCD for a fixed machineWhether a fixed appliance in a workshop needs an RCD.
- Choose the RCD for a vending machineThe RCD rule for a ride or a vending machine.
Mga input
Worked example gamit ang mga default na input.
- Bansa
- New Zealand
- Installation
- Residential
- Final subcircuit
- Mga socket‑outlet
- Rating ng circuit
- 20 A
- Rating ng socket-outlet
- 10 A
- Tungkulin ng proteksyon
- Proteksyon laban sa electric shock
- Rated residual current
- 30 mA
- Suriin ang nasukat na trip time
- Hindi
Karagdagang proteksyon ng RCD
Kinakailangan, 30 mA
- Rated residual current na hinihingi ng clause
- 30mA
- Pinakamataas na rated residual current para sa duty
- 30mA
- Limit sa rated residual current
- 300ms
- Limit sa limang beses ng rating
- 40ms
- Pinakamahabang oras ng disconnection
- 0.4s
Design aid lang ang resultang ito. I-verify ito laban sa kasalukuyang standard.
Mga hakbang ng kalkulasyon
- Kailangan ang karagdagang proteksyonOo
AS/NZS 3000:2018 Cl 2.6.3.3.1
- Rated residual current na hinihingi ng clause30mA
AS/NZS 3000:2018 Cl 2.6.3.3.1
- Pinakamataas na rated residual current para sa duty30mA
Electricity (Safety) Regulations 2010 reg 24
- Trip limit sa rated residual current300ms
Electricity (Safety) Regulations 2010 reg 24
- Trip limit sa limang beses ng rated residual current40ms
Electricity (Safety) Regulations 2010 reg 24
- Pinakamahabang oras ng disconnection0.4s
AS/NZS 3000:2018 Cl 5.7.2
- Hindi dapat mag-trip sa o mas mababa sa15mA
Electricity (Safety) Regulations 2010 reg 24
Tungkol sa calculator na ito
How this is calculated
The tool says whether a circuit needs additional RCD protection. It picks the rated residual current. It can also test a measured trip time against the limits.
- Need. The tool reads the installation and the circuit type. It decides whether Clause 2.6.3.3.1 of AS/NZS 3000:2018 asks for additional protection.
- Rated current. It gives the rated residual current that the clause requires for that circuit.
- Maximum for the duty. In New Zealand you pick the duty: shock, property, patient or children. The tool gives the highest rated residual current for that duty (Electricity (Safety) Regulations 2010 reg 24).
- Trip limits. It gives the trip limit at the rated residual current. It also gives the limit at five times that current (reg 24).
- Disconnection time. It gives the maximum disconnection time (Cl 5.7.2).
- Measured result. If you enter two trip times, the tool compares them with the limits. It also gives the current below which the device must not trip.
| Step | Table or clause | What it decides |
|---|---|---|
| Need for protection | Cl 2.6.3.3.1 | Whether the circuit needs an RCD |
| Rated current and trip limits | Reg 24 | The rating and the trip times by duty |
| Disconnection time | Cl 5.7.2 | The longest time to clear |
Worked example
- Socket‑outlets in a home, tested at 250 ms and 50 ms. The tool requires 30 mA protection. The limits are 300 ms at the rated current and 40 ms at five times it. The 50 ms reading exceeds 40 ms, so the test fails.
Limits
- The tool does not choose a make or model. It does not check discrimination between RCDs.
- It does not test nuisance tripping from earth leakage. A circuit with high leakage needs a site test.
- The type of RCD (A, F or B) comes from the equipment on the circuit. See the learn page on RCD types.
- The tool reads AS/NZS 3000:2018. Check the regulations for later changes.
- Australia caps the circuit and New Zealand caps the socket‑outlet in some cases. Check the hint on the form.
See also: RCD types and where they are required, Testing to Section 8 and Wet area zones.
Mga tanong
Design aid ang resulta. I-verify ito laban sa kasalukuyang standard.
Ano ang ginagawa ng RCD selection tool?
Iniuulat ng tool kung ang mga clause na sinusuri nito ay humihingi ng RCD bilang karagdagang proteksyon sa final subcircuit. Ibinibigay nito ang maximum rated residual current para sa duty at ang maximum trip time. Sinusuri din nito ang sinukat na trip time sa rated current at sa limang beses ng current na iyon laban sa mga limit na iyon.
Aling clause at regulation ang ginagamit nito?
Ang mga circuit sa New Zealand ay binabasa ayon sa AS/NZS 3000:2018 Clause 2.6.3.3, at ang mga Australian ay ayon sa Clause 2.6.3.2.2 o Clause 2.6.3.2.3.3. Ang electric vehicle circuit sa New Zealand ay binabasa ayon sa Clause 7.9.3 kapag domestic, at Clause 7.9.4 kung hindi. Ang domestic Mode 2 circuit ay gumagamit din ng 30 mA mula sa Clause 2.6.3.3.1. Galing ang trip limit sa Electricity (Safety) Regulations 2010 reg 24, at ang disconnection time sa Clause 5.7.2.
Ano ang RCD trip time limit sa New Zealand?
Ang shock protection RCD hanggang 30 mA ay may limit na 300 ms sa sarili nitong rated residual current. Sa limang beses ng current na iyon, 40 ms ang limit nito. Ang property protection ay gumagamit ng RCD na rated hanggang 300 mA, na may limits na 0.5 s at 0.15 s.
Bakit walang requirement na lumalabas para sa 40 amp circuit?
Sa Australia, binabasa ng tool ang Clause 2.6.3.2.3.3 sa labas ng residential installation. Sakop ng clause na iyon ang final subcircuit na rated 32 A o mas mababa, kaya sa mas mataas pa rito, walang iniuulat ang tool. Sakop ng Clause 2.6.3.2.2 ang bawat final subcircuit ng Australian residential installation, anuman ang rating. Wala ring rating cap ang residential clause ng New Zealand.
Sakop ba ng tool ang medical at patient areas?
Bahagi lang. Iniuulat nito ang 10 mA patient limits ng regulation 24. Hindi nito ina-apply ang AS/NZS 3003, ang patient areas standard. Basahin ito para sa medical location. Binabasa ng tool ang AS/NZS 3000 kasama ang Amendment 1. Ang EV at Australian residential na mga row ay bumabasa sa Amendment 1 to 3 compilation. Binago ng Amendment 2 ang ilang bahagi ng Clause 2.6.3; tingnan ang kasalukuyang text nito.
Mga worked example
- RCD tripping with no fault: add up the leakageAn RCD on a home office and kitchen trips with no fault found. Add up the standing leakage, check it against a third of 30 mA, and split it over two RCDs.
- Kitchen power points and the cooktop zonePlace power points and switches near a cooktop, an outdoor gas bottle and a gas vent. Check each distance to AS/NZS 3000 and hand the sink to the wet area tool.
- RCD arrangement for a house boardCheck a New Zealand house board of eight circuits on two RCDs. See what fails with a fourth circuit on one RCD or both lights on one, and the AU change.
- Wire a bathroom: zones, IP ratings and the RCDA New Zealand bathroom with a 1.6 m bath and an open shower, worked through the AS/NZS 3000 Section 6 zones, the IP each item needs, the RCD and bonding.
Background
- How many circuits can go on one RCDThe AS/NZS 3000 Cl 2.6.2.4 arrangement rules in plain words, which circuits need a 30 mA RCD in NZ and AU homes, how RCBOs count, and why the rules exist.
- Damp situations: the Section 6 zonesHow AS/NZS 3000 Section 6 zones the space around baths, showers, basins, spas, pools, fountains and saunas, how to read an IP code, and what A2 changed.
- RCD types and where they are requiredType AC, A, F and B, what each one detects, and the clauses that place them. The fault path behind them, worked on a 20 A circuit over 25 m.
Mga clause at table na binabasa ng tool na ito
- AS/NZS 3000:2018 Cl 2.6.3.2.2Additional protection in Australia, domestic and residential
- AS/NZS 3000:2018 Cl 2.6.3.2.3.3Additional protection in Australia, non‑domestic
- AS/NZS 3000:2018 Cl 2.6.3.3.1Additional protection in New Zealand, residential
- AS/NZS 3000:2018 Cl 2.6.3.3.2Additional protection in New Zealand, non‑residential
- AS/NZS 3000:2018 Cl 5.7.2Disconnection times
- AS/NZS 3000:2018 Cl 7.9.1Scope of Clause 7.9, electric vehicle supplies
- AS/NZS 3000:2018 Cl 7.9.3.2Mode 2 electric vehicle charging, New Zealand
- AS/NZS 3000:2018 Cl 7.9.3.3Mode 3 and Mode 4 electric vehicle charging, New Zealand
Bawat clause at table, kasama kung paano ito na-verify
Huling na-check ang mga table noong 27 Sept 2026.
Mga kaugnay na tool
- EV charger circuit calculatorCheck EV chargers for spare capacity, cable size and RCD.AS/NZS 3000AS/NZS 3008.1.2AS/NZS 3008.1.1
- Cable size calculatorFind the smallest cable size that passes each check.AS/NZS 3008.1.2AS/NZS 3008.1.1AS/NZS 3000
- RCD arrangement checkCheck circuits per RCD and the lighting split.AS/NZS 3000
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