外壳有一个接地柱，这个地方应该用哪个标志？带圈还是不带圈？
----->我们公司做投影机，里面的接线柱都用带圈接地符号。 The following situations are exempt from the above requirements:
– where terminals for the connection of a supply are provided on a component (for example, a terminal block) or subassembly (for example, a power supply unit), the symbol(没圈的接地符号) is permitted for the protective earthing terminal instead of(有圈的接地符号) ;
本人理解如下：
如果设备的端子连接的是一个零件（例如一个终端模块）或者组件（比如一个电源），有圈的接地符号可以代替没圈的接地符号。
– on subassemblies or components, the symbol(有圈的接地符号) is permitted in place of the symbol(没圈的接地符号)provided that it does not give rise to confusion.;
-->组件或者零件间的连接，如果用没圈的接地符号代替没圈的接地符号不会引起误解，则允许替代。
Question:
Is this requirement applicable to products provided with a mains inlet? If yes, is the symbol
IEC 417 No. 5019,(有圈的接地符号) then, required at the location where the earthing conductor (coming from
the inlet) is terminated?
Decision:
The symbol is not required in the above mentioned case7 C" U2 Z* d- F/ ~( n安规网www.angui.org
Explanatory notes:4 e! L3 B6 r" V7 H& I8 ~k安规网www.angui.org
It has been reported that some test houses require this symbol.
本人理解如下：
问题：上述要求适用于带主接口的产品吗？如果适用，就用有圈的接地符号，并要求接口的地线以此此接地符号处终止吗？
结论:上述情况不要用带圈的接地符号。
注：据说有些端口要用这种带圈的接地符号。 抛砖引玉，还望各位高手多多指正
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