AmpSize
A Tātaitai rahi taura and 84 more for New Zealand and Australia. Each result cites its clause and table.
He kore utu ia tātaitai. Kāore e hiahia he kaute hei tātaitai.
Android app on Google Play- Size a cable for a shedThe smallest cable that carries the load over the run to a shed.
- Size a submain for a tenancyThe smallest three phase submain that passes each check, on AU 3008.1.1:2025.
- Size a battery cableThe d.c. cable size for a 3 m, 48 V battery run at 100 A.
- Size a cable for an EV chargerThe cable size for a 32 A charger on a 25 m run.
- Wire a houseRooms and points become circuits, cable sizes and a maximum demand.
- Check a long run for voltage dropThe voltage drop on the run, against the limit.
AmpSize in 30 seconds
One job in the cable size calculator, from the inputs to a result you can keep.
Kua whakarōpūtia mō ngā tauwhiro katoa
Ngā tātaitai
85 tātaitai
Ngā taura
- Cable size
- Voltage drop
- Loop impedance
- Fault rating
- Conduit fill
- Voltage rise
- Underground cable
- Segregation and separation
- Maximum circuit length
- Simplified selector
- Minimum conductor size
- Imperial cable
- Comms cable selector
- Aerial clearances
- Site cord length
- Loop power budget
- DC cable size
- Correction factors
- Total voltage drop
- Conductor colours
- Cable tray fill
- Cable loss cost
Te tiaki
Ngā utanga
Power
Solar
Haumaru
Whakamātautau
Ngā aratohu
Ngā aratohu katoa- Builder's pole: supply, RCDs and cord lengthsA builder's pole for a house build, worked to AS/NZS 3012:2019. The supply it may take, the 30 mA RCDs, the Table 1 cord lengths and the test intervals.
- Car-park floodlight: obtrusive light at a boundaryTwo 10 000 lm floodlights 10 m from a neighbour's window in zone A2, checked against AS/NZS 4282 for lux at the window, candela and the upward light ratio.
- Homeowner shed supply voltage drop over 60 mA 20 A single‑phase supply running 60 m to a shed on 6 mm² copper, with the drop, the percentage and the maximum length the AmpSize voltage drop engine returns.
- Commercial 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.
- Generator fault current calculation at 400 VA 500 kVA 400 V standby set at 12 % subtransient reactance gives 721.69 A full load and 6014.07 A fault current, with the decay the figure leaves out.
- IEEE 1584-2002: arc flash model and limitsWhat the IEEE 1584-2002 empirical model governs, where it stops applying, and a 400 V switchboard study that lands on 7.54 cal/cm² at 455 mm.
- 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.
- Current-carrying capacity and deratingWhy one cable size has many ratings. Install method, ambient, grouping, soil and depth, with a 25 A circuit that needs 10 mm² once the factors apply.
- Downlights and insulation: IC-4, CA90 and Non‑ICThe six recessed luminaire classes, what insulation may do around each, which a NZ or AU home may have, the default clearances, and the roof space warning sign.
- Home batteries and AS/NZS 5139How a home solar battery is sized in kWh, what usable, nominal, depth of discharge and round-trip efficiency mean, and where AS/NZS 5139 lets one go.
- Home battery location and clearancesWhere AS/NZS 5139 lets an all-in-one home battery go. Restricted places, 600 and 900 mm zones, the habitable room barrier, ceiling, IP codes and working space.
- 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.