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对于IEC60335-1其实个人觉得最重要的几个关键词: 带电部件 可触及部件 还有绝缘/器具的分类几个概念。
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7 v( y. T; t! t/ Q对于任何一个产品，我们第一步要确定的是绝缘的类型：basic/supplementary/reinforced(double) insulation. 在对此判定的前面，我们必须考虑器具的类型（class 0, I, II III)。
! H; A/ d" M% F! u& g3 c以我们熟悉的无线水壶为例子。以(Strix connector)， 带地线.金属外壳，我们的第一印象，Class I appliance.
3 N, c* `# d, Y/ V& ~- x第二步：器具是 is in overvoltage catergory II,
+ a! B3 Q5 O/ P3 W4 n' b rated voltage 假定220-240V, so the overvoltage is 2500V.
9 m( x0 \* @ O2 Q- ~6 ~( b4 e8 ustep 3: for cr (see table 16)
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For basic insulation (clearance), there are two limit existed, 1.5mm for general basic insulation and 1.0mm for tubular heater
" M( l" b1 Z" X7 I. T6 x For supplementary insulation, it is same with basic insulation( {1 l+ ]1 h1 b$ E
For reinforced insulation, the higher step limit apply from table 16, that means the value for Overvoltage 4000V applies, it is 3.0mm2 A0 J- M5 w a# Q8 ^
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step 4: For Creepage
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0 G; A" P R& }* O7 A+ w0 H7 X' \for basic insulation: see table 17, usaally we can determine the appliance pollution degree from concerned part 2( see -2-15 for kettle), it is pollution degree IIII. and material group IIIa/IIIb.
q9 c: B/ Z" [# ethere are two limit existed, 4.0mm for general basic insulation and 1.0mm for tubular heater.
3 P8 ?$ T! l, S0 Q$ i8 {Supplementary insulation is same with basic general requirement
# [* U8 W. r, {2 tReinforced insulation is double the basic insulation.
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; [$ y; i5 J' gPlease Bear in mind, above analyse is based on Class I.
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% a- f, z7 d8 k" ENext stage, i will prove to you if the appliance is sold to Japan as class 0 or class 01, what will happen. |
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发表于 2008-8-12 16:08
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