Estimator guide
Pagpepresyo ng cable run mula sa size nito, at pag-iskedyul ng cable para sa isang job.
- 3 min basahinCommercial kitchen kW to amps full load currentTurning a 30 kW commercial kitchen nameplate load into 45.58 A at 400 V three phase, with the power factor step that a plain kW to amps sum leaves out.
- 3 min basahinDairy shed motor current: 15 kW at 400 VFull load current, shaft speed, torque and DOL starting current for a 15 kW 400 V dairy shed vacuum pump motor, worked through the AmpSize motor engine.
- 5 min basahinWhat size generator for a dairy shedSize a standby set for a dairy shed from its load list. The vacuum pump's start sets the size, then staggered steps, a drive and a soft starter shrink it.
- 5 min basahinCable 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.
- 3 min basahinGenerator full load current: 200 kVA to ampsA 200 kVA 400 V standby set converted to 288.68 A of full load current, 160 kW of real power and 2,405.63 A of initial fault current from 12 percent reactance.
- 3 min basahinOffice maximum demand per phase with Table C2An office fitout load schedule assessed against AS/NZS 3000 Table C2, group by group, landing on 413.7 A across three phases and 137.9 A per phase.
- 1 min basahinHow many amps can 10 mm² cable carry?10 mm² copper multicore PVC cable carries 50 A enclosed in air at 30 °C in NZ, so a 50 A breaker protects it. Clipped direct, it carries 58 A.
- 1 min basahinHow many amps can 16 mm² cable carry?16 mm² copper multicore PVC cable carries 66 A enclosed in air at 30 °C in NZ, so it takes a 63 A breaker. Grouped with two circuits, it carries 46.2 A.
- 3 min basahinSubmain voltage drop estimate for a 160 A tenderA price stage check on a 160 A submain over 80 m on 70 mm² XLPE. See the mV/A·m figure, the 1.89 percent drop and the length the budget allows.
- 3 min basahinSubmain cable size for 3‑phase 100 A over 60 mA 100 A tenancy submain on tray over 60 m at 40 °C. See the derating chain, the four checks and why the loop impedance check sets the size at 70 mm².
- 3 min basahin22 kW EV charger amps at 400 V three‑phaseA 22 kW three-phase EV charger draws 31.75 A at 400 V. See the inputs, the clause, the arithmetic and the current that feeds cable sizing and demand.
- 3 min basahinGenerator sizing for a 150 kVA holiday parkA 150 kVA three-phase standby set at 400 V gives 216.51 A full load current, 120 kW real power and 1443.38 A fault current from one nameplate.
- 4 min basahinElectrical estimating calculators NZ roundupA roundup of the calculators a New Zealand estimator uses at price stage, with a Table C2 fitout worked through to a demand of 102.95 A per phase.
- 4 min basahinAmpSize vs jCalc vs free cable sizing toolsCompare AmpSize with jCalc and other free cable sizing tools. One 63 A three-phase submain shows which checks decide a size, and what AmpSize leaves out.
- 3 min basahinAS/NZS 3000 Tables C1 and C2: demand groupsWhat the demand group letters govern, when to use Table C1 or Table C2, and a commercial assessment that returns 276.26 A total and 92.09 A per phase.
- 6 min basahinAS/NZS 3008.1.1 table numbers: 2017 to 2025Each AS/NZS 3008.1.1 table AmpSize reads, with its 2017 number, its 2025 number and whether its values moved, and one submain that cites both sets.
- 4 min basahinAS/NZS 3008.1.2 Tables 4 to 21: current ratingsWhat the current rating tables govern, which table AmpSize reads today, and a 40 A circuit that lands on 10 mm² with a derated capacity of 50 A.
- 4 min basahinAS/NZS 3008 Table 13 (now 3.18): multicore ratingsWhat AS/NZS 3008 Table 13 gives, why the 2025 AU part calls it Table 3.18, how to read its columns into the calculator, and what moved for buried cable.
- 3 min basahinMotor full load current: 11 kW 400 V DOLFull load current, shaft speed, torque and direct on line starting current for an 11 kW four-pole 400 V induction motor, with the figures the tool returns.
- 3 min basahinCommercial maximum demand with Table C2A tender-stage demand assessment for a commercial building using AS/NZS 3000 Table C2, with each group demand and the per-phase figure the tool returns.
- 5 min basahinAS/NZS 3008.1.1:2025: what changed from 2017The 2025 AU part adds d.c. ratings to 1500 V, renumbers every table and moves some ratings. Four circuits, each run on both editions, show what moves.
- 4 min basahinCable size for a 32 A single‑phase 25 m runWork through a 32 A single-phase circuit over 25 metres in New Zealand. See every derating factor, the check that sets the size, and the result the tool gives.
- 4 min basahinDomestic maximum demand with Table C1Assess the maximum demand of a New Zealand house from Table C1, group by group, with a worked example that lands on 52.61 A on a single-phase supply.
Mga calculator na ginagamit ng mga guide na ito
- Full load current calculatorKalkulahin ang full load current mula sa power, voltage at phase.
- Motor calculatorHanapin ang motor full load current, starting current at torque.
- Generator sizing mula sa load listI-size ang generator mula sa load list kasama ang motor starting.
- Cable tray at ladder fillLapad ng tray o ladder, mga tier, kg/m at ang grouping factor.
- Generator current calculatorFull load at fault current ng generator mula sa kVA nito.
- Maximum demand calculatorI-estimate ang maximum demand para sa domestic o non‑domestic loads.
- Pagsusuri ng umiiral na circuitTingnan ang naka-install na circuit: cable, device, drop at Zs.
- Voltage drop calculatorKalkulahin ang voltage drop sa cable run at tingnan ang limit.
- Cable size calculatorHanapin ang pinakamaliit na cable size na pumapasa sa bawat check.