Outbuilding earthing
I-earth ang shed: earth kasama ang submain, o sarili nitong MEN.
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.
- Earth a shed through the submainThe earth to run with a 10 mm² submain to a shed.
- Set up a shed as its own MENThe PEN, main earth and rod depth for a 16 mm² submain.
- Check a sleep-out with a metal water pipeA separate MEN where a metal pipe joins the buildings.
- Earth a farm shed in AustraliaA separate MEN on a strip electrode for a 25 mm² three phase submain.
Mga input
Worked example gamit ang mga default na input.
- Bansa
- New Zealand
- Outbuilding
- Indibidwal: isang istruktura na may sariling board
- Earthing arrangement
- Earth na kasama ng submain
- Mga phase ng submain
- Single phase
- Aktibong sukat ng submain
- 6 mm²
- Conductor
- Tanso
- Mga metal service sa pagitan ng mga gusali
- Hindi
Protective earthing conductor
2.5mm²
- Pinapayagan para sa outbuilding na ito
- Earth kasama ng submain, o hiwalay na MEN
Design aid lang ang resultang ito. I-verify ito laban sa kasalukuyang standard.
Mga hakbang ng kalkulasyon
- OutbuildingIndibidwal
AS/NZS 3000:2018 Cl 1.4.88
- Earthing arrangementEarth run kasama ang submain
AS/NZS 3000:2018 Cl 5.5.3.1(a)(i)
- Pinapayagan ditoOo
AS/NZS 3000:2018 Cl 5.5.3.1(a)(i)
- Protective earthing conductorResulta2.5mm²
AS/NZS 3000:2018 Table 5.1
Tungkol sa calculator na ito
How this is calculated
A shed, garage, sleep-out or workshop with its own board, fed by a submain, is an outbuilding. AS/NZS 3000 gives it two ways to be earthed. The tool asks which outbuilding it is and which way you plan, then checks the plan and gives the sizes.
An individual outbuilding is one structure, separated by land from the building whose board supplies it. It may take a protective earthing conductor run with the submain, connected at the main switchboard. Or it may be a separate MEN installation: the submain neutral becomes a PEN, the outbuilding board has its own MEN link, and an electrode is driven at the outbuilding. Combined outbuildings share a foundation, a metal roof or a metal frame. They take the earth with the submain only, so a separate MEN for them fails.
The sizes come from the same table as the earthing tool. With an earth in the submain, it is the protective earthing conductor for the submain's active size. With a separate MEN, the lead from the outbuilding board to its electrode is a main earthing conductor, sized from the submain. The PEN must be at least the neutral the submain needs and at least that earthing conductor, so the tool gives the larger. The electrode is one of the types the electrode table accepts, driven to the depth or laid to the length and cover for your country.
| Step | Table or clause | What it decides |
|---|---|---|
| Individual or combined | Cl 1.4.88 and Cl 1.4.89 | Which arrangements the outbuilding may take |
| Earth with the submain | Cl 5.5.3.1(a)(i) and Cl 5.5.2.1 | Where the earth connects |
| Separate MEN | Cl 5.5.3.1(a)(ii) and (c) | The MEN link, the board and the main earthing conductor |
| Combined outbuilding | Cl 5.5.3.1(b) | No separate MEN |
| Earthing conductor sizes | Table 5.1 | The protective and main earthing conductors |
| PEN size | Cl 3.5.2(c) | The least PEN of the submain |
| Electrode | Table 5.2 and Cl 5.3.6.3 | The electrode, and its depth, length and cover |
Worked examples
- A shed on a 10 mm² submain, earthed through the submain. The protective earthing conductor is 4 mm². No electrode is needed at the shed.
- A shed on a 16 mm² submain as its own MEN. The PEN is at least 16 mm², the main earthing conductor 6 mm², and the rod goes at least 1.8 m deep.
- A sleep-out with a metal water pipe to the house. The PEN is at least 6 mm². The tool warns that the pipe can carry neutral current in parallel with the PEN.
- A farm shed in Australia on a strip electrode. The PEN is at least 25 mm² and the main earthing conductor 6 mm². The copper strip is at least 3 m long with 0.5 m cover.
- Two sheds on one slab as a separate MEN. The arrangement is Not allowed and fails: combined outbuildings take an earth with the submain only.
Limits
The tool does not size the submain itself; use the cable size or total voltage drop tools for that. It does not check the earth fault-loop impedance at the outbuilding, which the loop impedance tool does. It does not decide whether a structure is an outbuilding: that is the definition and your site. Bonding of water pipes and other services follows the earthing tool.
See also: Earthing an outbuilding: earth or its own MEN, Shed earthing on a 16 mm² submain and Earthing and bonding.
Mga tanong
Design aid ang resulta. I-verify ito laban sa kasalukuyang standard.
Kailangan ba ng shed ng sarili nitong earth stake?
Hindi palagi. Pinapayagan ng AS/NZS 3000 Cl 5.5.3.1 na ang isang hiwalay na outbuilding ay kumuha ng earth run kasama ang submain, nang walang electrode. Maaari rin itong maging hiwalay na MEN installation, at kung gayon, kailangan nito ng sarili nitong electrode at MEN link.
Ano ang pagkakaiba ng isang individual at combined na outbuilding?
Ang individual na outbuilding ay isang istruktura na may sarili nitong board, at hiwalay sa lupa mula sa gusaling nagsusuplay dito. Ang combined outbuildings ay nagbabahagi ng foundation, metal na bubong o metal na frame. Ang combined outbuildings ay may earth sa pamamagitan ng submain lang.
Anong laki ang PEN papunta sa hiwalay na MEN shed?
Hindi bababa sa neutral na kailangan ng submain, na active size para sa single‑phase submain, at hindi bababa sa earthing conductor mula sa Table 5.1. Ibinibigay ng tool ang mas malaki.
Gaano kalalim ang earth electrode?
Hindi bababa sa 1.8 m ang driven rod sa New Zealand at 1.2 m sa Australia. Ang strip sa trench ay may hindi bababa sa 0.5 m na cover at hindi bababa sa 7.5 m ang haba sa New Zealand o 3 m sa Australia.
Bakit mahalaga ang mga metal na pipe sa pagitan ng mga gusali?
Kapag may hiwalay na MEN, ang neutral ng submain ay siya ring earth. Ang metal na water pipe o walkway sa pagitan ng mga gusali ay maaaring magdala ng bahagi ng neutral current nang parallel. Nagbababala ang tool, at naiiwasan ito ng earth na kasama ng submain.
Mga worked example
Background
Mga clause at table na binabasa ng tool na ito
- AS/NZS 3000:2018 Cl 1.4.88Outbuilding definition
- AS/NZS 3000:2018 Cl 3.5.2(c)PEN conductor to an outbuilding
- AS/NZS 3000:2018 Cl 5.3.6.3Installing an earth electrode
- AS/NZS 3000:2018 Cl 5.5.2.1Where the protective earthing conductor connects
- AS/NZS 3000:2018 Cl 5.5.3.1Earthing an outbuilding
- AS/NZS 3000:2018 Cl 5.5.3.1Earthing arrangements for an outbuilding
- AS/NZS 3000:2018 Table 5.1Minimum earthing conductor size by active conductor size
- AS/NZS 3000:2018 Table 5.1Minimum copper earthing conductor size for aluminium active conductors
Bawat clause at table, kasama kung paano ito na-verify
Huling na-check ang mga table noong 1 Oct 2026.
Mga kaugnay na tool
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