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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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" _/ D9 \' v3 d" {$ x. @+ B0 c% R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)。. D, b* s6 S& x* {$ D7 d
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., F* s1 x8 n5 Y- O& ]
第二步：器具是 is in overvoltage catergory II,' A" k4 j c9 W4 {8 E
rated voltage 假定220-240V, so the overvoltage is 2500V.7 c" @! w5 T% B6 V# y3 p
step 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
+ R M" g6 g. H$ N3 M5 R For supplementary insulation, it is same with basic insulation
! \# z% [1 U! D+ W) c+ A For reinforced insulation, the higher step limit apply from table 16, that means the value for Overvoltage 4000V applies, it is 3.0mm
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5 h, y" n% O7 ~' J9 F sstep 4: For Creepage
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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.' \0 j" U$ F$ E# J
there are two limit existed, 4.0mm for general basic insulation and 1.0mm for tubular heater.4 z3 }0 d d* K
Supplementary insulation is same with basic general requirement( C9 n$ c6 A5 w$ _5 h9 J- _3 E2 N
Reinforced insulation is double the basic insulation.$ Y0 G) p, V% z) [5 j$ K9 x
& }' s8 V' E+ x3 w9 XPlease Bear in mind, above analyse is based on Class I.% x& s1 F5 y- w+ Z4 N
* R( {# A8 R' q; T1 R5 y$ `Next 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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