Engineer guide
Pag-check ng design, paggawa ng evidence, at pag-ihambing ng mga posibleng cable size para sa isang trabaho.
- 4 min basahinCar-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.
- 3 min basahinGenerator 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.
- 3 min basahinIEEE 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.
- 5 min basahinArc flash at a 48 V home batteryClass a 48 V lithium home battery with 6 kA at its terminals by AS/NZS 5139, find its arc flash energy and PPE level, then bring it down with fuses.
- 3 min basahinIEC 60255-151: IDMT curve constantsWhat IEC 60255-151 governs, which curve sets the IDMT tool carries, and a worked grading pair on standard inverse that clears in 0.21 s and 0.74 s.
- 3 min basahinArc flash boundary at a motor control centreArcing current, incident energy and arc flash boundary for a 400 V MCC at 25 kA with a 0.1 s clearing time, and why the equipment type moves the result.
- 4 min basahinSwitchboard fault rating at 25 kA for 1 sA 1 second withstand check at 25 kA on 185 mm² copper XLPE, returning a 174.83 mm² minimum size and a 26.46 kA withstand, with a thin margin explained.
- 3 min basahinDC isolator rating for a 10 kW solar arrayRate the d.c. isolator and size the frame earth for a four-string domestic array. Check one data sheet that passes and one that fails per pole.
- 3 min basahinSolar string sizing for a 600 V inverterHow many 49.5 V modules fit a string on a 600 V inverter at -5 °C? Work cold Voc, hot Vmp, the string current, fuses and the d.c. isolator by AS/NZS 5033.
- 3 min basahinStarting a loaded conveyorA 22 kW conveyor that needs 120 % torque to break away. Why star-delta and a soft starter will not start it, and what a drive or autotransformer does.
- 4 min basahinMotor circuit for a 15 kW pump: DOL or star-deltaSize a 15 kW 400 V pump circuit: cable, breaker, contactor and overload relay. Compare DOL, star-delta, soft starter and drive starts.
- 3 min basahinTransformer secondary fault current for 500 kVAA 500 kVA 11 kV to 400 V transformer at 6 percent impedance, worked through to 721.69 A of secondary full load current and 12,028.13 A of fault current.
- 3 min basahinFactory power factor correction: 250 kW at 0.78A 250 kW factory load at 0.78 power factor lifted to 0.95. The kvar, the capacitor steps, the current saved, the kVA released and why the bank is detuned.
- 3 min basahinFault level at a sub‑board, 300 kVA transformerWork the prospective fault current at a sub-board 45 m from a 300 kVA transformer, three-phase and phase-earth, and check 6 kA and 10 kA breakers against it.
- 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 basahinArc flash incident energy at a 400 V switchboardA 400 V board with 20 kA bolted fault and 0.2 s clearing gives 6.23 cal/cm² at 455 mm, an arcing current of 9.64 kA and a 1395.97 mm boundary.
- 4 min basahinAS/NZS 3008.1.2 Table 52: the k factorWhat Table 52 governs, how the adiabatic check uses k, and a 10 kA fault cleared in 0.1 s that needs 22.11 mm² against an installed 25 mm² conductor.
- 3 min basahinIDMT curve grading for a 100 A feederTwo standard inverse relays at 2000 A give a feeder trip at 0.23 s, an incomer trip at 0.99 s and a grading margin of 0.76 s, read off one chart.
- 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 3008.1.1 vs 3008.1.2: AU and NZ conditionsThe AU part of AS/NZS 3008.1 rates cable at 40 °C air and the NZ part at 30 °C. One 32 A circuit needs 6 mm² in Australia and 4 mm² in New Zealand.
- 5 min basahinAS/NZS 3008 vs BS 7671: cable sizing comparedHow BS 7671 and AS/NZS 3000 with AS/NZS 3008.1 size a cable, where they differ, and why a BS current rating never converts into an AS/NZS one.
- 5 min basahinDC cable size: 48 V battery and 600 V PV arrayTwo d.c. circuits sized to AS/NZS 3008.1.1:2025, a 48 V battery-to-inverter run that current sizes and a 600 V array feed that voltage drop sizes.
- 3 min basahinProspective fault current at a main switchboardA 16 kA fault cleared in 0.1 s on 70 mm² copper XLPE, with the minimum conductor size, the withstand current and the k factor the adiabatic check 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.
- 3 min basahinVoltage rise for a 5 kW solar inverter cableA 5 kW single-phase inverter 40 m from the switchboard on 10 mm² copper, with the rise in volts, the percent and the maximum length the tool returns.
- 4 min basahinEarth fault loop impedance and maximum ZsWhat earth fault loop impedance measures, how the maximum Zs check works, and a 32 A circuit on 6 mm² over 25 m that lands on 0.67 ohms against a 0.96 limit.
- 3 min basahinVoltage drop with the mV/A·m methodHow the millivolt per amp metre method works, with a 32 A run over 25 metres on 6 mm² copper and the exact drop, percent and maximum length the tool returns.
Mga calculator na ginagamit ng mga guide na ito
- Obtrusive light checkerTingnan ang outdoor light sa boundary window ayon sa AS/NZS 4282.
- Generator current calculatorFull load at fault current ng generator mula sa kVA nito.
- Arc flash calculatorI-estimate ang enerhiya ng arc flash at ang PPE category nito.
- Battery arc flash and classBattery DVC, hazard class, arc flash energy at PPE level.
- IDMT grading calculatorI-plot ang trip curves ng inverse-time overcurrent relays.
- Cable fault rating calculatorTingnan kung kayang tiisin ng conductor ang fault current.
- PV isolator and earthing calculatorI-rate ang PV array cable, d.c. isolator at earthing.
- PV string calculatorModules per string, string current at isolator para sa PV.
- Paghahambing ng motor starting methodIkumpara ang DOL, star-delta, soft start at drive starts.
- Motor circuit calculatorCable, breaker, contactor at overload para sa isang motor.
- Transformer calculatorKalkulahin ang transformer full load current at impedance.
- Power factor correction calculatorHanapin ang capacitor kvar para itaas ang power factor.
- Fault level calculatorProspective fault current sa board mula sa source nito.
- Cable size calculatorHanapin ang pinakamaliit na cable size na pumapasa sa bawat check.
- DC cable size calculatorI-size ang d.c. cable hanggang 1500 V para sa current at voltage drop.
- Voltage Rise calculatorKalkulahin ang voltage rise para sa embedded generation o PV.
- Earth fault loop impedance calculatorTingnan ang earth fault loop impedance laban sa maximum Zs.
- Voltage drop calculatorKalkulahin ang voltage drop sa cable run at tingnan ang limit.