最小导体截面查询
查阅回路允许的最小导体截面。
Reads AS/NZS 3000:2018. Tables checked 26 Sept 2026.
尝试一个工程 5
每项工作都会预填示例数值。请替换为您自己的数值。
- Find the smallest control conductor allowedThe minimum copper size for a signal and relay control circuit.
- Find the smallest aerial conductorThe minimum aluminium size for an aerial run.
- Find the smallest flexible cordThe minimum size for a flexible cord.
- Find the smallest bare conductorThe minimum size for a bare conductor.
- Find the smallest parallel conductorThe minimum size a conductor in parallel may be.
输入
使用默认输入值的示例计算。
- 回路用途
- 插座
- 导体材料
- 铜
- 并联导体
- 否
最小导体规格
2.5mm²
- Table 3.3 数值
- 2.5mm²
- 受以下规定约束
- AS/NZS 3000:2018 Table 3.3
此结果仅供设计参考。请对照现行标准进行核验。
计算步骤
- Table 3.3 最小截面2.5mm²
AS/NZS 3000:2018 Table 3.3
- 适用的最小规格结果2.5mm²
AS/NZS 3000:2018 Table 3.3
关于此计算器
How this is calculated
The tool looks up the smallest conductor that AS/NZS 3000:2018 Table 3.3 allows for a use. It is a table lookup. It does not size a cable for current or voltage drop.
- Use. You pick the use: socket‑outlets, other circuits, signal and relay control, bare conductors, insulated flexible conductors or aerial wiring.
- Material. You pick copper or aluminium. Table 3.3 has no aluminium row for some uses. The tool then refuses and says so.
- Table value. The tool reads the minimum cross-sectional area from Table 3.3 for that use and material.
- Parallel conductors. You can mark the conductors as run in parallel. The tool then compares the table value with the parallel floor and keeps the larger.
- Size that applies. The tool gives the minimum size that applies, and names Table 3.3 as the source.
| Step | Table or clause | What it decides |
|---|---|---|
| Table value | AS/NZS 3000 Table 3.3 | The smallest area for the use and material |
| Parallel floor | Cl 3.4.3 | The floor for a parallel group |
| Size that applies | Table 3.3 | The larger of the two |
Worked example
Aerial wiring in copper. The tool gives 6 mm². The Table 3.3 value is also 6 mm², and the source is AS/NZS 3000:2018 Table 3.3.
Limits
- Table 3.3 carries two exceptions. Read them before you use the size.
- Exception 1 can allow a smaller socket‑outlet conductor. It sets conditions that you must meet first.
- The minimum is a floor. The cable must also pass current capacity, voltage drop and fault checks.
- Use the cable size calculator for those checks.
- Clause 3.4.3 sets more conditions on a parallel group than a minimum size.
- The tool does not read AS/NZS 3008.1.
See also: Cable size calculator, Voltage drop calculator and What size breaker for 4 mm² cable.
问题
结果仅供设计参考。请依据现行标准核对。
插座回路需要的最小电缆截面是多少？
AS/NZS 3000:2018 Table 3.3 规定插座回路应采用 2.5 平方毫米 的导体。Exception 1 允许采用较小截面的导体，但仅限于其规定的条件。在采用低于表中数值的导体之前，请完整阅读 Exception 1。本工具会报告表中数值，并指向 Exception 1。
控制或信号回路的最小截面是多少？
Table 3.3 规定其他回路为 1 mm²，继电器控制及信号回路为 0.5 mm²。裸导体为 6 mm²。绝缘软导线为 0.75 mm²。
架空布线需要多大的截面？
Table 3.3 规定铜质架空布线为 6 mm²，铝质架空布线为 16 mm²。请在表单中选择材料，以查看适用数值。
并联连接电缆是否会改变最小值？
是的。AS/NZS 3000:2018 Clause 3.4.3 规定并联组中每根电缆的最小截面为 4 mm²。该条款还设定了其他条件。设计并联线路前，请完整阅读该条款。
本工具读取的条款和表格
- AS/NZS 3000:2018 Cl 3.4.3Conductors connected in parallel
- AS/NZS 3000:2018 Table 3.3Nominal minimum cross-sectional area of conductors
表格最后核对于 26 Sept 2026。
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