Industrial aratohu
Ngā ara iahiko mōtā, ngā reiti hapa me te grading whakamaru mō ngā whakaurunga ahumahi.
- 3 meneti te pānuiGenerator 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 meneti te pānuiIEEE 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.
- 3 meneti te pānuiDairy shed IDMT relay setting and gradingThree IDMT relays at a 3000 A fault, two grading margins and one curve inversion between the shed main and the farm incomer, read off the AmpSize relay engine.
- 3 meneti te pānuiDairy 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.
- 3 meneti te pānuiIEC 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.
- 5 meneti te pānuiWhat 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.
- 3 meneti te pānuiArc 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.
- 5 meneti te pānuiCable 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 meneti te pānuiMotor starting current for a 55 kW DOL startFull load current, DOL starting current, shaft speed and torque for a 55 kW four pole motor at 400 V, and what a soft starter or a VSD changes.
- 2 meneti te pānuiIP ratings for an outdoor point and a hosed shedWhich IP code an outdoor power point, a milking shed light and a hosed switchboard need, and why an IP67 light can fail where IP65 passes.
- 3 meneti te pānuiStarting 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 meneti te pānuiMotor 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 meneti te pānuiTransformer 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 meneti te pānuiFactory 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 meneti te pānuiFault 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.
- 3 meneti te pānuiArc 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.
- 3 meneti te pānuiIDMT 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.
- 4 meneti te pānuiAS/NZS 3008.1.2 Tables 22 to 29: deratingWhat the derating tables govern, how ambient and grouping combine into one factor, and a 63 A feeder whose capacity falls to 78.85 A on 35 mm² copper.
- 3 meneti te pānuiAS/NZS 3008 Table 22 (now 3.33): bunched groupingAS/NZS 3008 Table 22 is the grouping table for bunched circuits, not a temperature table. The 2025 AU part calls it Table 3.33. Read it in the calculator.
- 5 meneti te pānuiAS/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.
- 4 meneti te pānuiAWG and the NEC for NZ and AU electriciansAWG sizes and the NEC set against AS/NZS 3000 and 3008.1. A gauge converts to mm², but its rating does not, and the NEC 3 % drop figure is only a note.
- 3 meneti te pānuiMotor 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.
Ngā tātaitai e whakamahia ana e ēnei aratohu
- Tātaitai iahiko generatorTe iahiko uta katoa me te iahiko hapa o tētahi generator mai i tōna kVA.
- Tātaitai Arc FlashTātaungia te pūngao o tētahi arc flash me tōna karaehe PPE.
- Tātaitai IDMT gradingWhakatakotoria ngā kōpiko tuku o ngā relay overcurrent wā-whakahuri.
- Tātaitai mōtāKimihia te iahiko uta katoa mōtā, te iahiko tīmata me te torque.
- Rahi generator mai i tētahi Rārangi UtaWhakaritea te rahi o tētahi generator mai i tētahi rārangi uta me te tīmatanga mōtā.
- Whakakī cable tray me te ladderTe whānui o te tray, te ladder, ngā tiers, kg/m me te tauwehe whakarōpū.
- Tūtohi me te whakamārama IP ratingWetekina tētahi waehere IP, ā, kimihia te iti rawa mō tētahi wāhi.
- Whakataurite tikanga tīmatanga mōtāWhakatairitea ngā tīmatanga DOL, star-delta, soft start me te drive.
- Tātaitai ara iahiko mōtāTaura, breaker, contactor me te overload mō tētahi mōtā.
- Tātaitai TransformerTātaitia te iahiko uta katoa me te impedance o te transformer.
- Tātaitai power factor correctionKimihia te kvar o te capacitor hei whakapiki i tētahi power factor.
- Tātaitai taumata hapaTe iahiko hapa ka puta pea i tētahi papa mai i tōna puna.
- Tātaitai rahi tauraKimihia te rahi taura iti rawa e pass ana i ia arotake.
- Kaiwhakarerekē rahi taura imperialKimihia te reiti taputapu mō tētahi taura imperial tawhito.