这种适配器到底是I类还是Ⅱ类器具？标Ⅱ类器具符号（回）会被判不合格？

IEC 60335-1:1991, 3rd Ed.

8.1.4 

DSH-492

Subject内容

Keywords关键词

Protection against access to live parts防触电保护

-Functional earthing功能性接地

Decision taken at 40th CTL meeting 2003

2003年CTL第40届会议决议

Question 问题

Is functional earthing for the secondary circuit of SELVtransformers permitted?

SELV安全特低电压变压器的次级电路是否可以功能性接地？

Rationale: 理由

See question.

见问题

Decision： 决议

1) Earthing of secondary circuits of SELV transformers (PELVcircuits) is acceptable in general except when SELV is specificallyrequired by the standard for a specific circuit (for example inwhirlpool baths), in which case earthing of the secondary circuitsare acceptable if:

SELV变压器的次级电路（PELV电路）的接地通常是可以接受的，除非特定电路的标准（例如在涡流浴缸）特别要求SELV，在这种情况下，如果满足以下条件，则次级电路的接地是可以接受的：

a) the accessible parts of the secondary circuits are separatedfrom the protective earthing circuit by at least protectiveimpedance, or

次级电路的可触及部分与保护接地电路之间至少要有保护阻抗分开，或者

b) the accessible parts of the secondary circuits are eitherdirectly connected to the protective earthing circuit or areprotected against accidental contact by insulation as specified forClass III appliances or constructions, in particular the insulationshall be capable of withstanding a test voltage of 500 V AC for 1min.

次级电路的可触及部分要么直接连接到保护性接地电路，要么通过针对Ⅲ类器具或结构规定的绝缘进行保护，以防止意外接触，尤其是绝缘应能够承受电气强度500V AC 1 min。

Accessible parts directly connected to the protective earthingcircuit shall comply with the requirements for protective earthing(see sub-clause 27.5) or shall be separated from live parts of thesupply with insulation as specified for Class II construction.

直接连接到保护性接地电路的可触及部件应符合保护性接地的要求（见27.5条款），或应与电源的带电部件分开，并按II类结构的规定进行绝缘处理。

2. See also the following figure.

 也见下图

Explanation:解释

This decision is applicable also to IEC 335-1:1976.

该决定也适用于IEC 335-1：1976标准。

Fig.1 functional earthing for SELV circuits

图1  安全特低电压电路功能性接地

Fig.2 functional earthing for SELV circuits

图2安全特低电压电路功能性接地