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。
Reads AS/NZS 3012:2019. Tables checked 1 Oct 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。
- Check the length of a site leadWhether a 50 m, 15 A lead of 2.5 mm² is in the limit on site.
- Check a light-duty site leadWhether a 25 m, 10 A lead of 1.0 mm² is in the limit.
- Check two leads joinedWhether two joined leads stay in the limit.
- Check a coiled leadWhat a coiled lead does to the limit.
- Check a lead from a socket assemblyA lead that runs from a portable socket‑outlet assembly.
输入
使用默认输入值的示例计算。
- 额定电流
- 10 A
- 导体截面积
- 2.5 mm²
- 电缆
- 单相，三芯
- 用途
- 一般用途，如锯、磨光机和电钻
- 从插座至设备的总长度
- 40 m
- PSOA 供电引线
- 0 m
- 插座之前固定布线已使用的电压降
- 0 %
- 两个或以上的电源延长组件连接在一起
- 否
- 软线以盘绕或卷盘方式使用
- 否
最大长度
60m
- 已核对长度
- 40m
- PSOA 供电引线
- 0m
- 限值内
- 是
- 线长所依据的电压降
- 5%
- 上游已使用的电压降
- 0%
- 设备处的总电压降
- 5%
- 参考
- AS/NZS 3012:2019 Table 1
此结果仅供设计参考。请对照现行标准进行核验。
计算步骤
- 已录入长度40m
AS/NZS 3012:2019 Table 1
- PSOA 供电引线0m
AS/NZS 3012:2019 Cl 2.6.10(b)
- 长度按 Table 1 校核40m
AS/NZS 3012:2019 Table 1
- 额定电流10A
AS/NZS 3012:2019 Table 1
- 导体截面积2.5mm²
AS/NZS 3012:2019 Table 1
- 长度所依据的电压降5%
AS/NZS 3012:2019 Table 1
- 上游已使用的电压降0%
AS/NZS 3012:2019 Table 1
- 该长度所隐含的总压降5%
AS/NZS 3012:2019 Table 1
- 最大长度60m
AS/NZS 3012:2019 Table 1
- 一般用途，单相结果60m
AS/NZS 3012:2019 Table 1
- 一般用途，三相120m
AS/NZS 3012:2019 Table 1
- 特定用途，单相35m
AS/NZS 3012:2019 Table 1
- 特定用途，三相70m
AS/NZS 3012:2019 Table 1
关于此计算器
How this is calculated
The tool checks a cord or flexible cable on a construction site. It uses the length limit in AS/NZS 3012:2019 Table 1. The limit depends on the rated current, the conductor area, the use and the phases.
- Length entered. You enter the length of the cord run. You can add the length of the PSOA supply lead, under Cl 2.6.10(b).
- Length checked. The tool adds the two. It checks that total against Table 1.
- Rated current and area. It reads the Table 1 row for your rated current and conductor area.
- Use and phases. It picks the column: general or specific use, single or three phase.
- Maximum length. It gives the Table 1 length. The inside-the-limit answer passes when the length checked is at or under it.
- Total drop. The Table 1 length is based on a 5 % drop. The tool adds the drop already used upstream and gives the total at the equipment.
| Step | Table or clause | What it decides |
|---|---|---|
| PSOA lead | AS/NZS 3012 Cl 2.6.10(b) | The length counted with the cord |
| Maximum length | Table 1 | The limit for the rating, area and use |
| Total drop | Table 1 | The drop at the equipment, with the upstream drop |
Worked example
A 10 A single‑phase cord of 1.5 mm², 50 m long, for general use. The maximum length is 35 m. The 50 m run fails. A 2.5 mm² cord at 40 m passes, with a maximum of 60 m.
Limits
- The 5 % drop is in addition to the drop the fixed installation already used. Enter the real upstream drop.
- A zero upstream drop is the default. Treat it as optimistic.
- The figures suit ordinary site power tools.
- The smallest flexible cord conductor is 1 mm². Every cord carries its own earth conductor.
- Cord extension sets use heavy duty sheathed cable (Cl 2.6.3).
- Do not use double adaptors or piggyback plug adaptors (Cl 2.6.6).
See also: Construction site supplies, AS/NZS 3012, Builder's pole house build supply, RCDs and cord lengths and the site supply tool.
问题
结果仅供设计参考。请依据现行标准核对。
施工现场的延长线最长可以拉多长？
AS/NZS 3012:2019 Table 1 给出各额定电流及导体截面的限值。额定 10 A、2.5 mm² 的单相通用软线限长 60 m。同样截面的三相四芯电缆可达 120 m。
一般用途与特定用途有什么区别？
通用用途适用于锯、角磨机和电钻等日常现场工具。其长度允许在额定电流下压降 5 %。专用用途适用于电动机启动失败会危及人身安全的设备。其长度允许压降 3 %，因此长度较短。
表中的电压降是否包括固定布线？
否。表中的百分比叠加于固定布线在插座之前已产生的压降之上。请输入该数值，工具将显示设备处的总压降。每项结果均注明此点。
两根延长线可以接在一起使用吗？
是的，前提是整条线路都在 Table 1 的一个限值内。输入每组连接软线的总长度，工具将核对该总和。PSOA 供电线也计入其中，因此工具会将其相加。AS/NZS 3012 建议只用一组软线，并规定不得使用盘绕或卷在线盘上的软线。
允许的最小软线导体是多少？
Cl 2.6.2 规定软线每根芯线的最小截面为 1.0 mm²。软线还需要在带电导体旁设置一根接地导体。
计算示例
背景
本工具读取的条款和表格
- AS/NZS 3012:2019 Cl 2.6.2Site flexible cords
- AS/NZS 3012:2019 Cl 2.6.3Site cord extension sets
- AS/NZS 3012:2019 Cl 2.6.6Site adaptors
- AS/NZS 3012:2019 Cl 2.6.7Cord and cable length limit on a site
- AS/NZS 3012:2019 Cl 2.6.8(b)Joined extension sets on a site
- AS/NZS 3012:2019 Cl 2.6.10(b)PSOA supply lead counted in the cord length
- AS/NZS 3012:2019 Table 1Maximum cord and cable lengths for construction sites
表格最后核对于 1 Oct 2026。
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