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引用第3楼aha0827于2011-04-15 13:47发表的 :9 t, ]* v( ]0 f, A
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: t" w) ^% k4 _7 E4 ^) b: d. [UL1031是哪个版本,我使用的第5版(2009)没有该条款耶!
3 L# e( [( N9 d& k在UL60950-1中插孔极性标识是通过以下来规定的吗?% w* P6 ~9 n+ d2 ]! ?2 b
----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 " S- j0 \- @ p" }2 z6 P! Q
+ C& r* B' N1 `) m1.the following information may be provided: c)rated output frequency or frequency range or symbol for d.c
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# W2 @6 C# s! ?" q*************************************************************************************************$ Z4 L8 j( w& H a7 V3 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 a0 S+ x: U7 s+ r& e" P5 c
polarized termination. |
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