Rapu taura pūoho ahi
Rapua ngā ture taura me te ara iahiko mō ngā pūnaha pūoho ahi.
Reads NZS 4512:2010. Tables checked 26 Sept 2026.
Whakamātau mahi 4
Ka whakakī ia mahi i ngā uara tauira. Whakakapia ērā ki ō uara.
- Choose the cable for a sounder circuitThe minimum conductor size for a fire alarm alerting device circuit.
- Choose the cable for a detector circuitThe minimum conductor for a four‑core detector circuit.
- Choose the cable for a transmission pathThe fire rating a transmission path needs.
- Choose the cable for staged evacuationThe cable for a staged evacuation circuit.
Ngā whakauru
He tauira mahi me ngā whakauru taunoa.
- Momo ara iahiko
- Ara iahiko kaitirotiro, kaitohu ringa rānei
- Ngā ngākau o te uaua
- 2
Rahi kaikawe iti rawa
0.75mm²
- E hiahiatia ana he kaiwhakahaere whiri
- Āe
- Ōkeroa insulation i runga ake
- 5MΩ
- Reiti ahi
- Kāore i whakaritea e tēnei upoko
- Clause
- 402.1
He āwhina hoahoa tēnei hua. Manatokohia ki te paerewa o nāianei.
Ngā hīkoi tātaitanga
- Te clause e pā ana402.1
NZS 4512:2010 Cl 402.2
- Ngā matua i roto i te uaua2
NZS 4512:2010 Cl 402.1
- Rahi kaikawe iti rawaHua0.75mm²
NZS 4512:2010 Cl 402.1
- Kaiwhakahaere whiri e hiahiatia anaĀe
NZS 4512:2010 Cl 402.1
- Ka pā te whiri i raro iho1mm²
NZS 4512:2010 Cl 402.1
- Ārai whakamaherehanga teitei ake5MΩ
NZS 4512:2010 Cl 402.2
- Ine ahiKāore i whakaritea e tēnei upoko
NZS 4512:2010 Cl 402.2
Mō tēnei tātaitai
How this is calculated
The tool looks up what a fire alarm circuit needs from NZS 4512:2010 Clauses 402.1 and 402.2. It gives the conductor size, the stranding, the insulation resistance and the fire rating.
- Circuit. You pick the circuit: detector, alerting device, transmission, staged evacuation, data link or mains supply.
- Clause. The tool picks the clause. Cl 402.1 covers detector and alerting device circuits. Cl 402.2 covers the rest.
- Cores. You enter the number of cores in the cable. The size rule in Cl 402.1 reads it.
- Conductor size. The tool gives the minimum conductor size and says whether it must be stranded.
- Insulation resistance. From Cl 402.2 it gives the minimum insulation resistance.
- Fire rating. It gives the fire rating, or says that this clause does not set one.
| Step | Table or clause | What it decides |
|---|---|---|
| Conductor size and stranding | NZS 4512 Cl 402.1 | The smallest conductor and its construction |
| Insulation resistance | Cl 402.2 | The minimum test result |
| Fire rating | Cl 402.2 | The rating, where the clause sets one |
Worked example
A detector circuit in 2‑core cable. The minimum conductor size is 0.75 mm². The conductor must be stranded. The insulation resistance must be above 5 MΩ. This clause sets no fire rating.
Limits
- The tool reads Cl 402.1 and 402.2 only. Check the cable specification and the mechanical protection in Cl 402.1.
- Clause 402.2(g) is the other size driver. Read it in full.
- Check the earthing rules for zone circuit wiring in Cl 402.2(i).
- Check the separation and identification rules in Cl 402.2(k).
- The tool does not check voltage drop on the circuit.
- NZS 4512:2021 supersedes the 2010 edition this tool reads.
See also: Fire alarm battery, Detector spacing and the segregation checker.
Pātai
He āwhina hoahoa te hua. Manatokohia ki te paerewa o nāianei.
He rahi taura pēhea e hiahiatia ana e tētahi ara pūoho ahi?
Ka hoatu a NZS 4512:2010 Clause 402.1 i te 0.75 mm² ia kaikawe mō te taura rua-kaikawe, me te 0.5 mm² ia kaikawe ina neke atu i te rua ngā kaikawe o te taura. Ka whakaatu hoki a AmpSize i te paepae whiri 1 mm² o taua clause. Pānuitia Clause 402.1 mō ngā momo taura me te whakamaru e whakaaetia ana e ia.
Ko ēhea ngā ara iahiko pūoho ahi e hiahia ana i te fire-rated cable?
Ka whakaatu a AmpSize i ngā keehi e rua. Ka hoatu a Clause 402.2(m) i te 15 meneti tōtuia ki AS/NZS 3013 Classification WS11 mō tētahi ara iahiko tuku. Ka hoatu a Clause 402.2(r) i te WS51W mō ngā taura whakawaho whiwhi wāhanga. Pānuitia kātoa ngā clause e rua, nā te mea he tikanga kei roto i ia tētahi e kore e tirohia e tēnei taputapu.
Me whai ara iahiko puna motuhake te pūoho ahi?
Āe. Ka tono a Clause 402.2(f) mō tētahi final subcircuit motuhake me tētahi tohu pūmau. Ka tā a AmpSize i te kōrero tohu e hoatu ana e te clause, FIRE ALARM. Pānuihia a Clause 402.2(f) mō te wāhi e tīmata ai te subcircuit, me te wāhi e tika ai te tohu.
He aha te aukati insulation e tūmanako ana?
Ka whakatakoto a Clause 402.2(j) i te paearu ki runga ake i te 5 MΩ, ā, ka whakaatu a AmpSize i tērā tauanga. Ka kawe a Clause 402.2(i) me Clause 402.2(k) i ngā ture whakawhenua me te wehenga mō taua waea ōrite. Pānuitia ēnei e toru i mua i tō rekoata i tētahi hua whakamātautau.
Ka whakamana tēnei taputapu i te whakaurunga e ea ana?
Kāo. Ka pūrongo a AmpSize i ngā tatauranga o NZS 4512:2010 Clauses 402.1 me 402.2 mō te ara iahiko ka kōwhiria e koe. He tohu anake tēnei, ehara i te whakataunga. Ka arotakehia te whakaurunga pūoho ahi ki te paerewa katoa, ā, ki ngā ture waea hoki.
Ngā Clause me ngā Table e pānuitia ana e tēnei taputapu
- NZS 4512:2010 Cl 402.1Fire alarm cable
- NZS 4512:2010 Cl 402.2Fire alarm cable installation
- Cl 402Fire alarm cable and circuit requirements
Ia Clause me Table, me te pēhea i manatokotia ai ia tētahi
Ngā tūtohi i arotakehia whakamutunga i te 26 Sept 2026.
Ngā taputapu hononga
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