回路负荷计算器
统计终端分支回路可承载的点位数。
Reads AS/NZS 3000:2018. Tables checked 27 Sept 2026.
尝试一个工程 6
每项工作都会预填示例数值。请替换为您自己的数值。
- Load a control panelThe load on each circuit in the panel.
- Count sockets on a house circuitThe loading of twelve 10 A socket‑outlets on a 20 A circuit.
- Count lights on a circuitThe loading of thirty lighting points on a 10 A circuit.
- Load a kitchen circuit with a hobThe demand of a 7.2 kW hob on its circuit.
- Load an office socket circuitThe loading of eight 10 A socket‑outlets on a 20 A office circuit.
- Apply diversity upstreamThe loading of a submain that feeds six circuits.
输入
使用默认输入值的示例计算。
- 断路器额定值
- 20 A
- 电缆截面
- 2.5 mm²
- 安装
- 住宅
- 照明点位
- 0
- 10 A 插座
- 8
- 15 A 插座
- 0
- 20 A 插座
- 0
- 固定或静止负载
- 0 A
- 包括烹饪设备
- 否
- 应用上游差异系数
- 否
各分项之和
8A
- 断路器额定值
- 20A
此结果仅供设计参考。请对照现行标准进行核验。
计算步骤
- 照明点0A
AS/NZS 3000:2018 Table C9
- 10 A 插座8A
AS/NZS 3000:2018 Table C9
- 15 A 插座0A
AS/NZS 3000:2018 Table C9
- 20 A 插座0A
AS/NZS 3000:2018 Table C9
- 固定及静止负载0A
AS/NZS 3000:2018 Table C9
- 各项贡献之和结果8A
AS/NZS 3000:2018 Table C9
- 断路器额定值20A
AS/NZS 3000:2018 Table C9
关于此计算器
How this is calculated
The tool counts the points a final subcircuit can carry. It reads AS/NZS 3000:2018 Table C9. You enter the breaker rating, the cable size and the points on the circuit.
- Lighting points. Each point adds the current that Table C9 gives for a lighting point.
- Socket‑outlets. The tool counts 10 A, 15 A and 20 A socket‑outlets. Each group has its own contribution in Table C9.
- Fixed and stationary load. You enter the rated current of fixed loads. The tool adds it in full.
- Cooking and diversity. If you turn them on, the tool adds the cooking demand and applies the diversity for upstream devices.
- Sum of contributions. The tool adds all contributions.
- Check. It compares the sum with the breaker rating. The pair of cable size and device rating must also be one that Table C9 lists.
| Step | Table or clause | What it decides |
|---|---|---|
| Point contributions | AS/NZS 3000:2018 Table C9 | The current each point counts for |
| Sum | Table C9 | The total counted load |
| Pair | Table C9 | Whether the cable and device are listed together |
Worked example
- Eight 10 A socket‑outlets on a 20 A circuit. The cable is 2.5 mm² in a domestic installation. The sum of contributions is 8 A. That is within the 20 A breaker rating, so the tool passes the circuit.
Limits
The tool fails a circuit when the sum is over the rating. It warns when Table C9 does not pair the cable with the device. It also fails a cooking range that the table does not permit.
It counts points. It does not check the voltage drop or the loop impedance. Use the cable size calculator for those.
See also: Maximum demand with Table C1 and C2, What size breaker for 4 mm² cable and the maximum demand tool.
问题
结果仅供设计参考。请依据现行标准核对。
回路负荷工具有什么作用？
工具会累加终端分支回路上每个点位的贡献。照明点位各计 0.5 A。在非住宅装置且无空调的情况下，10 A 插座计 2 A，否则计 1 A。总和不得超过断路器额定值。
它采用哪些表格？
各项数值取自 AS/NZS 3000:2018 Table C9。烹饪需量取自 Table C5。上游同时系数取自 Table C4。电缆与装置的配对取自同一 Table C9 行。
一个 20 A 回路可接多少个插座？
在家用装置中，每个 10 A 插座计为 1 A。因此 20 个插座即达到 20 A 保护装置的额定值。在无固定空调的非家用装置中，每个插座计为 2 A。因此 10 个插座即达到同一额定值。
本工具读取的条款和表格
- AS/NZS 3000:2018 App C Para C2.5Demand on a final subcircuit
- AS/NZS 3000:2018 Table C4Upstream circuit loading after diversity
- AS/NZS 3000:2018 Table C5Maximum demand for domestic cooking appliances
- AS/NZS 3000:2018 Table C9Loading of points per final subcircuit
表格最后核对于 27 Sept 2026。
相关工具
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