中等级别
实际工程背后的概念：最大需量、回路阻抗和电缆选型表。
- 阅读约 4 分钟AS/NZS 3008.1.1:2025: what the AU part coversWhat AS/NZS 3008.1.1:2025 covers, a.c. to 0.6/1 kV and d.c. to 1500 V at 40 °C air and 25 °C soil, how its sections run, and where the d.c. tables are.
- 阅读约 5 分钟Battery classes and arc flash in AS/NZS 5139How AS/NZS 5139 classes a battery system by hazard and decisive voltage class, works its arc flash energy, and sets the PPE, consequence and home limits.
- 阅读约 4 分钟Cable tray fill: one layer, tiers and groupingHow cables lie on a tray or ladder for AS/NZS 3008.1, touching or spaced, when a run needs another tier, and why there is no fill percentage to work to.
- 阅读约 5 分钟Checking an existing circuitThe five checks AmpSize runs on an installed circuit, from Iz and voltage drop to Zs and fault withstand, and what a site test adds that a calculation cannot.
- 阅读约 4 分钟Choosing a comms cable: length and screenCheck a comms cable run before you order it. Length limits for RS-485 and Ethernet, the 4-20 mA loop and the screen rule, with three worked runs.
- 阅读约 6 分钟Construction site supplies: AS/NZS 3012What AS/NZS 3012:2019 asks of the electrical supply on a construction or demolition site, from the supply and the RCDs to cords, generators and testing.
- 阅读约 4 分钟Control panels and PLC wiringSegregation of LV and ELV in a control panel, terminal and numbering practice, panel earthing, and the 24 V DC voltage drop that long instrument loops fail on.
- 阅读约 5 分钟Correction factors in the 2017 and 2025 editionsWhat each AS/NZS 3008 correction factor does, how the factors multiply, and which values changed when AS/NZS 3008.1.1:2025 replaced the 2017 tables.
- 阅读约 5 分钟Damp situations: the Section 6 zonesHow AS/NZS 3000 Section 6 zones the space around baths, showers, basins, spas, pools, fountains and saunas, how to read an IP code, and what A2 changed.
- 阅读约 5 分钟DC voltage drop and conductor resistanceWhy d.c. drop is 2 × I × R × L, why it has no reactance or power factor, and how the hot resistance, the cable tables, the limit and parallel cables change it.
- 阅读约 3 分钟Earthing an outbuilding: earth or its own MENWhen a shed or sleep-out takes an earth with its submain and when it may have its own MEN link and electrode, the PEN size, and the electrode depths to use.
- 阅读约 5 分钟Generator sizing for motor startingWhy a motor's start, not its running load, often sets a generator's size. Running and starting kVA, voltage dip, starting methods and derating.
- 阅读约 3 分钟IB ≤ IN ≤ IZ: the overload rule on a 32 A circuitThe overload rule is IB ≤ IN ≤ IZ. A grouped 32 A circuit fails on 6 mm² and passes on 10 mm², with an IZ of 37.6 A. Why the order matters.
- 阅读约 4 分钟IEC 60364 and the Wiring RulesIEC 60364 is the international series that AS/NZS 3000 stays aligned with. See how its parts are numbered, what TN-C-S, TT and IT mean, and where MEN fits.
- 阅读约 4 分钟Lighting layout and the lumen methodHow many luminaires does a room need? The lumen method from target lux to a grid, worked on an 8 m by 6 m office, with the checks the tool applies.
- 阅读约 5 分钟Loop impedance and disconnection timeZe, R1+R2, Zs and Ia, and the two disconnection times, worked on a 32 A curve C circuit over 30 m that returns 0.79 Ω against a 0.96 Ω limit.
- 阅读约 4 分钟Maximum demand and diversityWhy consumer mains are smaller than the sum of the loads. The four methods of Cl 2.2.2, the Table C1 groups, and a house that lands on 70.18 A.
- 阅读约 4 分钟Motor circuits and startingHow full load current sizes the cable and starting current sizes the device on a motor circuit, with a worked 22 kW 400 V motor and the cable the tool selects.
- 阅读约 4 分钟Motor starters, contactors and overload relaysHow to choose a motor starter: locked-rotor current, star-delta, soft starters, AC-3 and AC-23 duty, the overload relay and when motor protection applies.
- 阅读约 3 分钟Motor starting methods: current and torqueWhy a cage motor draws six or seven times full load current at start, and how star-delta, an autotransformer, a soft starter and a drive trade it for torque.
- 阅读约 4 分钟Obtrusive light and the 4282 zonesHow AS/NZS 4282 limits spill light from outdoor lighting at a neighbour's window, by environmental zone A0 to A4, curfew, intensity and upward light ratio.
- 阅读约 4 分钟Power factor and reactive powerWhat power factor is, why a low one costs current and capacity, how a capacitor bank corrects it in steps, and when harmonics call for a detuned bank.
- 阅读约 4 分钟PV and inverter basicsHow a grid-connected PV system connects to an installation, why voltage rise sets the inverter cable, and which standards the AmpSize tools cannot quote.
- 阅读约 4 分钟PV array isolators and earthingHow parallel strings feed a fault, what Ithe, Ie and make and break mean for a d.c. isolator, and how AS/NZS 5033 earths and alarms a PV array.
- 阅读约 3 分钟PV string voltage and temperatureWhy a PV string's voltage rises in the cold and falls in the heat, how AS/NZS 5033 limits it, and how the string current, fuses and isolator follow.
- 阅读约 4 分钟RCD leakage and nuisance trippingWhy an RCD trips with no fault. Where standing leakage comes from, the one-third and one-half points of Cl 2.6.2.1, class limits against measured figures.
- 阅读约 5 分钟RCD types and where they are requiredType AC, A, F and B, what each one detects, and the clauses that place them. The fault path behind them, worked on a 20 A circuit over 25 m.
- 阅读约 4 分钟Short-circuit withstand and the k factorThe adiabatic check in plain terms: prospective fault current, clearing time and k, worked on 25 mm² copper XLPE at 10 kA for 0.1 s.
- 阅读约 4 分钟Testing to Section 8: what each test provesThe Section 8 test sequence, what each test shows, and how a calculated earth fault loop impedance compares with the value a tester reads on site.
- 阅读约 4 分钟Underground cables and civil interfacesBurial categories, depth of cover, bedding and separation for underground cables, with a worked 100 A submain that changes size when the trench changes.
本指南使用的计算器
- 电缆截面计算器求出通过各项检查的最小电缆截面。
- 直流电缆截面计算器按电流和电压降为最高 1500 V 的直流电缆选型。
- 蓄电池电弧闪络与等级蓄电池 DVC、危险等级、电弧闪络能量及个人防护装备等级。
- 太阳能储能电池计算器为光伏晚间负荷选型家用储能电池。
- 电弧闪络计算器估算电弧闪络能量及其个人防护装备类别。
- 电缆桥架与梯架填充率桥架或梯架宽度、层数、kg/m 及成组系数。
- 修正系数计算器读取每个修正系数，以及电缆所需的额定值。
- 现有回路检查检查已安装回路：电缆、保护装置、电压降和 Zs。
- 接地故障回路阻抗计算器对照最大 Zs 检查接地故障回路阻抗。
- 通信电缆选型选择通信电缆并检查线路长度。
- 4–20 mA 回路供电预算检查 4–20 mA 回路离开变送器时的电压。
- 施工现场供电计算器施工现场的供电、RCD 及测试规则。
- 现场软线长度计算器施工现场上电缆或软线可以敷设的最长长度。
- 测试与标签周期便携设备的复测周期和合格限值。
- 手持设备供电读取 regs 88 至 89A 所列的供电安排。
- 展览与游乐场布线检查器展览布线的 RCD 检查，以及现场布线深度和高度。
- 电压降计算器计算电缆线路的电压降并检查限值。
- 蓄电池组计算器根据负荷计算蓄电池组容量及续航时间。
- 满载电流计算器根据功率、电压和相数计算满载电流。
- 电缆屏蔽层接地选型求出电缆屏蔽层、排流线或铠装的接地位置。
- 潮湿区域分区检查器求出近水区域的 Section 6 分区、IP 及 RCD。
- RCD 选型计算器检查是否需要 RCD，并测试动作时间。
- 附属建筑接地棚屋接地：可与分支干线共用接地，或采用独立的 MEN。
- 接地与等电位连接计算器选定接地、总接地及等电位连接导体。
- 根据负荷清单进行发电机选型根据负荷清单（含电动机启动）为发电机选型。
- 发电机电流计算器根据发电机的 kVA 求出满载电流和故障电流。
- 电动机计算器求出电动机的满载电流、启动电流和转矩。
- 电缆短路耐受计算器检查导体能否承受故障电流。
- 最大需量计算器估算家用或非家用负荷的最大需量。
- 照明光通量法计算器按光通量法得出的房间灯具数量及布置网格。
- 三相功率计算器在功率、电流、电压和功率因数之间换算。
- 电动机回路计算器单台电动机的电缆、断路器、接触器和过载保护。
- 电动机启动方式对比比较 DOL、星三角、软启动和变频启动。
- 干扰光检查器依据 AS/NZS 4282，检查边界窗处的室外照明干扰光。
- 功率因数补偿计算器求出提高功率因数所需的电容器 kvar。
- 电压升高计算器计算分布式发电或光伏的电压升高。
- 光伏隔离开关与接地计算器核定光伏阵列电缆、直流隔离开关及接地。
- 光伏组串计算器光伏组件每串数量、组串电流及隔离开关。
- RCD 持续漏电流预算一个 RCD 可承受多少持续漏电流。
- RCD 配置检查检查每个 RCD 的回路数及照明分配。
- 变压器计算器计算变压器满载电流和阻抗。
- 测试结果检查器对照 Section 8 限值，检查实测测试结果。
- 埋地电缆埋深计算器埋地电缆的覆土深度及分隔要求。
- 线管填充率计算器检查电缆束能否放入线管。