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引用第3楼aha0827于2011-04-15 13:47发表的 :$ h9 F9 Y2 P# y' ]8 G
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UL1031是哪个版本,我使用的第5版(2009)没有该条款耶!3 w1 @ P' f4 _4 H
在UL60950-1中插孔极性标识是通过以下来规定的吗?
8 Q5 X) f; L6 n$ L) R, F3 T# A----Symbo for nature of supply , for d.c. only
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$ V0 Q3 ^2 g& m& T& WUL60950-1 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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7 s0 E# t+ I8 V' K/ y# [- F( t1.the following information may be provided: c)rated output frequency or frequency range or symbol for d.c
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& W! {2 |! \7 l& I: T% _*************************************************************************************************: a( l9 g0 \- W4 G! \; t
UL1310 我刚才看到是2001年的,第五版在clause 51.6
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The polarity of a direct-current output shall be plainly marked, unless the unit is provided with a7 {8 _3 W/ L& {2 z+ }# a4 g( n5 `/ r
polarized termination. |
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