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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。4 y# h" {+ T/ O X; F! a, }
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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)。6 h0 H3 v" b: {7 l/ 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.+ A! G. C# y4 ]0 F! a
第二步：器具是 is in overvoltage catergory II,
8 D' a Q3 t7 K1 u( b) z rated voltage 假定220-240V, so the overvoltage is 2500V.) ?& e/ a5 D1 p& l5 b
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: F* ~) e& W: L2 J% F
For supplementary insulation, it is same with basic insulation! q* w5 ?' i$ b; [' V" M) I; ^
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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& r2 X" n* R* b8 [) Estep 4: For Creepage n: u' Y/ e7 a, c/ ^3 g- M- e+ o1 s
) {+ O$ J- S$ T `7 _- [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 Y$ f$ ?2 a5 g3 `
there are two limit existed, 4.0mm for general basic insulation and 1.0mm for tubular heater.# h" t, j: G8 S( x4 D# a2 z
Supplementary insulation is same with basic general requirement
' d7 X, e1 s$ w1 sReinforced insulation is double the basic insulation.% x _. k% X$ A( H: @+ T
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Please Bear in mind, above analyse is based on Class I.+ G* ^6 x; H3 m; p6 @8 u+ t( ?' v
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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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