跳至内容
AmpSize

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。

AS/NZS 3000数据审核中

Reads AS/NZS 3000:2018 and HELUKABEL and LAPP catalogues 2024. Tables checked 27 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。

输入

使用默认输入值的示例计算。

屏蔽层的作用
抗干扰屏蔽
屏蔽结构
铝箔和编织层
根据 Cl 5.4.1，该电缆需要接地
是
屏蔽层与带电导体之间为双重绝缘，并带有整体护套
否
您正在检查的内容
哼声回路或环流
护套接触输送易燃介质的管道
否

接地方式

一端位于起点

Clause
AS/NZS 3000:2018 Cl 5.5.3.2(b)
原因
Earth the screen at the end where the cable leaves its switchboard or accessory. One earthing point leaves no closed path through the screen. No current then circulates in it, and no hum loop forms.
所需连续性
是
屏蔽结构
铝箔和编织层
结构说明
Overall foil with a tinned copper braid over it. The catalogue puts this construction against both low-frequency and high-frequency interference. Manufacturer data, not a standard. Source: HELUKABEL Industrial Ethernet Cables, SF/UTP ranges.
结构数据来源
manufacturer-data

此结果仅供设计参考。请对照现行标准进行核验。

计算步骤

  1. 屏蔽作用emc-screen

    AS/NZS 3000:2018 Cl 5.5.3.2(b)

  2. 已匹配条款情形a screen, armour or sheath on a cable or cord that needs earthing

    AS/NZS 3000:2018 Cl 5.5.3.2(b)

  3. 接地方式结果一端位于起点

    AS/NZS 3000:2018 Cl 5.5.3.2(b)

  4. 需要连续性是

    AS/NZS 3000:2018 Cl 5.5.4.3

  5. 您正在检查什么hum-loop
  6. 屏蔽结构铝箔和编织层

    HELUKABEL and LAPP catalogues 2024

  7. 依目录，反向作用both

    HELUKABEL and LAPP catalogues 2024

关于此计算器

How this is calculated

The tool reads AS/NZS 3000:2018 Clause 5.5.3.2 for where a cable screen, drain wire or armour is earthed. It then states what that choice does to hum loops and touch voltage.

  1. Role. You pick what the metal does, such as an EMC screen.
  2. Clause case. The tool matches your role, your earthing need and your double-insulation answer to a case in Cl 5.5.3.2.
  3. Arrangement. It gives the earthing arrangement for that case. For an EMC screen against hum, this is one end, at the origin.
  4. Continuity. It reads Cl 5.5.4.3 for the continuity the screen needs. The screen and its fittings stay continuous.
  5. Concern. It states the effect on your concern. One earthing point leaves no closed path through the screen, so no hum loop forms.
  6. Construction. It adds the catalogue note for the screen type. This is maker data, not a Standard.
StepTable or clauseWhat it decides
ArrangementAS/NZS 3000 Cl 5.5.3.2Where the screen is earthed
ContinuityCl 5.5.4.3The screen and fittings stay continuous
Construction noteHELUKABEL and LAPP catalogues 2024What the screen type acts against

Worked example

A foil and braid EMC screen with a hum loop concern. The tool gives one end, at the origin, from Cl 5.5.3.2(b). Continuity is required.

Limits

  • The tool gives the safety arrangement of AS/NZS 3000. It does not give an EMC design.
  • No document the tool holds backs earthing both ends for EMC. Check the device maker guide or IEC 61918.
  • The gland advice is an AmpSize recommendation, not a requirement.
  • The tool does not check the current rating of the screen.

See also: Segregation checker, Control panels and PLC wiring and The MEN system.

问题

结果仅供设计参考。请依据现行标准核对。

电缆屏蔽层在哪里接地？

AS/NZS 3000:2018 Clause 5.5.3.2(b) 规定了起始端，但未规定接地点的数量。对于需接地的屏蔽层、铠装或护套，应在电缆离开配电箱或电气附件处接地。该标准未规定两端接地的方式，因此本工具不给出此类结果。

单端接地能否消除嗡声环流？

是的。屏蔽层只在一点接地时，屏蔽层中不存在闭合回路，因此没有电流在其中流通，也不会形成嗡声环路。若在两点接地，则会形成该回路。

屏蔽层何时无需接地？

Clause 5.5.3.2(b) 给出两项例外。第一项要求屏蔽层或编织层与带电导体之间为双重绝缘，并且电缆上还需有非导电护层。每个接头和端接处都必须与带电部分及外露导电部分保持距离。第二项适用于 Clause 5.4.1 未涵盖的任何情形。

屏蔽层能否作为接地导体？

是的，依据 Clause 5.3.2.2(ii)，并须满足 Clause 5.3.2.3(b) 的一项条件。为该设备供电的每根带电导体都必须敷设于同一根电缆内。Clause 5.5.4.3 还要求连续性，并要求阻抗与铜制接地导体相匹配。

屏蔽层构造建议从哪里来？

来自 HELUKABEL 和 LAPP 产品目录。这些是制造商数据，而非标准，本工具会相应标注。编织层主要抑制低频干扰，箔层主要抑制高频干扰。产品目录涵盖端接五金件。二者及 AS/NZS 3000 均不支持两端接地方式。

背景

本工具读取的条款和表格

所有条款和表格，及各自的核验方式

表格最后核对于 27 Sept 2026。

相关工具

这是否有用？

有问题，或数值看起来有误？联系我们。