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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。% j) J# P$ S5 |* o n5 E
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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)。
8 o0 h2 j1 [8 |8 U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.
1 p% E7 K% P6 U第二步：器具是 is in overvoltage catergory II,
# e; ]* p# r _3 n rated voltage 假定220-240V, so the overvoltage is 2500V.! A& K: u4 H+ Z
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
- @, {( d* ~5 y" f For supplementary insulation, it is same with basic insulation
9 V+ v$ \+ H! D1 {5 `( e) |# | g For reinforced insulation, the higher step limit apply from table 16, that means the value for Overvoltage 4000V applies, it is 3.0mm4 m3 J8 c- F& \- t- V1 v7 L7 ?9 [( m
5 ?- W) ?' h1 z, U. q$ |( Pstep 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.6 Q' ^9 S3 } Q. z1 G( I1 L
there are two limit existed, 4.0mm for general basic insulation and 1.0mm for tubular heater.( t( C( {6 d7 N: \; g
Supplementary insulation is same with basic general requirement
2 i* s, V" v" ~ x" [Reinforced insulation is double the basic insulation.' w0 A w: }' Z5 F; i: `% F( ^1 T
( A6 ^2 u# X* oPlease Bear in mind, above analyse is based on Class I.
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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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