Conduit fill calculator
Tingnan kung kasya ang cable bundle sa conduit.
Reads AS/NZS 3000:2018. Tables checked 19 Sept 2026.
Subukan ang isang job 7
Nilalagyan ng halimbawang value ang bawat job. Palitan ang mga ito ng sarili mong value.
- Fill a conduitThe space factor of a 4 mm² single core circuit in a 25 mm conduit.
- Fit a submain in a conduitWhether four 16 mm² singles fit in a 32 mm conduit.
- Fit two flat cables in a conduitWhether two 2.5 mm² twin and earth cables fit in 20 mm.
- Fit PV string cablesWhether six 6 mm² singles fit in a 32 mm conduit.
- Fit a 35 mm² submainWhether four 35 mm² singles fit in a 50 mm conduit.
- Fit a motor circuitWhether four 6 mm² singles fit in a 25 mm conduit.
- Fit cables in an Australian conduitWhether four 4 mm² singles fit in a 25 mm conduit on the Australian sizes.
Mga input
Worked example gamit ang mga default na input.
- Bansa
- New Zealand
- Laki ng conduit
- 32 mm
- Mga cable
- 2 row
Conduit fill
97.66%
- Pinapayagang fill
- 40%
- Inirerekomendang conduit
- 50mm
- Internal area ng conduit
- 539.13mm²
- Lawak ng cable
- 526.52mm²
Design aid lang ang resultang ito. I-verify ito laban sa kasalukuyang standard.
Mga hakbang ng kalkulasyon
- Panloob na area ng conduit539.13mm²
AS/NZS 2053 / AS/NZS 5000 manufacturer data (derived)
- Lawak ng cable526.52mm²
AS/NZS 2053 / AS/NZS 5000 manufacturer data (derived)
- Fill percentResulta97.66%
AS/NZS 3000:2018 App C Para C6.2; Tables C10–C12 give a maximum-count guide
- Inirerekomendang conduit50mm
Tungkol sa calculator na ito
How this is calculated
The tool checks that a bundle of cables fits in a conduit. It uses the fill percentage method of Paragraph C6.2 in Appendix C of AS/NZS 3000:2018. Appendix C also holds Tables C10 to C12, which list a maximum count of cables instead.
- Conduit area. The tool reads the internal area of the conduit size you pick. The data comes from the maker and AS/NZS 2053 sizes. The AmpSize hub marks this value as derived.
- Cable area. It reads the overall area of each cable by size and cores. It multiplies by the count and adds the rows.
- Fill percent. It divides the cable area by the conduit area.
- Permitted fill. It applies the space factor of Paragraph C6.2. The factor is 50 % for one cable and 33 % for two. It is 40 % for three or more.
- Result. The tool passes the bundle when the fill is at or below the permitted figure. It gives the smallest conduit that passes.
| Step | Table or clause | What it decides |
|---|---|---|
| Fill percent | AS/NZS 3000 App C Para C6.2 | The space factor for the bundle |
| Maximum count | AS/NZS 3000 Tables C10 to C12 | A guide by cable count |
Worked example
- 4 single‑core cables of 6 mm² in a 25 mm conduit. The cables take 81.71 mm² of a 301.72 mm² conduit. The fill is 27.08 % against a 40 % limit. The bundle passes.
Limits
- The tool does not model bends, pull length or the pulling tension. A long or bent run needs a bigger conduit.
- It does not apply a derating for cables in conduit. Use the correction factors calculator for that.
- It reads one conduit. It does not check a trunking or a cable tray.
- The conduit areas are maker data, not a Standard value. Check them against the conduit you buy.
See also: Conduit fill and installation methods, Conduit fill for 4 x 6 mm² in 25 mm and Appendix C conduit space factor.
Mga tanong
Design aid ang resulta. I-verify ito laban sa kasalukuyang standard.
Ano ang ginagawa ng conduit fill calculator?
Pinagsasama-sama ng tool ang cross sectional area, cable kada cable, para sa buong bundle. Hinahati nito ang kabuuan sa internal area ng conduit para makuha ang fill percent. Ikinukumpara nito ang fill sa pinapayagang limit at minumungkahi ang pinakamaliit na nominal conduit na kasya sa bundle.
Anong fill limit ang ginagamit ng tool?
Ginagamit ng tool ang 50 porsyento para sa isang cable, 33 porsyento para sa dalawang cable, at 40 porsyento para sa tatlo o higit pa. Ito ang space factor sa AS/NZS 3000:2018 Appendix C, Paragraph C6.2. Ang Tables C10 hanggang C12 ng parehong Appendix ay nagbibigay ng maximum cable count method sa halip.
Aling mga input ang pinakamahalaga?
Itinatakda ng nominal conduit size ang internal area. Itinatakda ng laki ng conductor, ng bilang ng core, at ng bilang ng cable ang cable area. Sa parehong laki ng conductor, magkaiba ang overall diameter ng single core cable at ng multicore cable. Kaya nagbabago ang resulta depende sa pinili mong core.
Ano ang mga karaniwang gotcha?
Ginagamit ng tool ang fill percentage method, hindi ang cable count method. Galing sa datos ng manufacturer ang overall diameter at nag-iiba ayon sa brand. Hindi namomodelo ang mga bend at draw-in force. Nasa page address ang laki ng conduit at ang mga row ng cable, kaya muling nagagawa ng link ang bundle.
Mga worked example
- Cable tray fill for a plant room: a second tierLay ten multicore cables on a 300 mm perforated tray in one layer, see when it takes a second tier, and carry the grouping factor into the cable size.
- AS/NZS 3000 Appendix C: conduit space factorWhat the conduit space factor in AS/NZS 3000 Appendix C governs, which tool reads it, and a worked 50 mm conduit that reaches 52.95 % fill against a 40 % limit.
- Conduit fill: 4 x 6 mm² singles in 25 mmFour 6 mm² single‑core cables in 25 mm conduit, with the fill percent, the space factor and the smallest conduit the tool recommends for the bundle.
Background
- Conduit fill and installation methodsHow the conduit space factor works, what the fill percent means against the 40 % limit, and how the install method names on site map to the 3008 columns.
- Underground cables and civil interfacesBurial categories, depth of cover, bedding and separation for underground cables, with a worked 100 A submain that changes size when the trench changes.
Mga clause at table na binabasa ng tool na ito
- AS/NZS 3000:2018 App C Para C6.2Cables in enclosures
- AS/NZS 3000:2018 Tables C10 to C12Maximum cable counts in conduit
- AS/NZS 2053 heavy-duty conduit (manufacturer data)Conduit internal diameters
- AS/NZS 5000.1 cables, manufacturer dataCable overall diameters
Bawat clause at table, kasama kung paano ito na-verify
Huling na-check ang mga table noong 19 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
- Cable tray at ladder fillTray or ladder width, tiers, kg/m and the grouping factor.AS/NZS 3008.1
- Underground cable depth calculatorDepth of cover and separation for a buried cable.AS/NZS 3000
Nakatulong ba ito?
May tanong, o may value na mukhang mali? Makipag-ugnayan sa amin.