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引用第3楼aha0827于2011-04-15 13:47发表的 :
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UL1031是哪个版本,我使用的第5版(2009)没有该条款耶!
1 m9 w( w' m% C! L8 \$ P9 M! I; J+ n在UL60950-1中插孔极性标识是通过以下来规定的吗?, L0 i1 G- U& {4 f' e
----Symbo for nature of supply , for d.c. only
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UL60950-1 中是通过Symbo for nature of supply , for d.c. only规定的,而且还可以参考TableNAA.1(informative)1.7.1
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1 V8 f z" }( j" v1.the following information may be provided: c)rated output frequency or frequency range or symbol for d.c* r' y& {( C8 o+ Y9 @, M1 S$ W
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UL1310 我刚才看到是2001年的,第五版在clause 51.6
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/ q! C4 Z0 h9 Y s" q: `3 ?The polarity of a direct-current output shall be plainly marked, unless the unit is provided with a
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