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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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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 Q) j6 z+ a8 t
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.
6 y6 L B Y) b' K- ]( v第二步：器具是 is in overvoltage catergory II,1 o$ X2 q; C; k, ~; U' R. E
rated voltage 假定220-240V, so the overvoltage is 2500V.
8 o* c$ x/ T2 [0 n5 E( @1 q# z9 n7 dstep 3: for cr (see table 16)) [5 Q8 g- J3 W
- a" Z; g1 Y `3 c% V For basic insulation (clearance), there are two limit existed, 1.5mm for general basic insulation and 1.0mm for tubular heater
; ]0 }1 N6 T2 {- o* e1 V6 m For supplementary insulation, it is same with basic insulation5 `1 o- Z4 d9 M) `' S( y
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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step 4: For Creepage & X+ h9 U! R/ K% j$ o
# d$ T" x( ~ o' `# Dfor 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.! @) _8 r/ Z5 X8 l) k
there are two limit existed, 4.0mm for general basic insulation and 1.0mm for tubular heater.. I: h' v6 n/ H+ p1 F
Supplementary insulation is same with basic general requirement5 T- g3 F& H) z- S4 c
Reinforced insulation is double the basic insulation.+ H5 T( K' C4 x' t- m
2 M# ~. b) B2 K4 \7 T5 ]. K$ y" d) mPlease Bear in mind, above analyse is based on Class I.6 S4 j) V* M5 D: }& @) H
) W$ p( D: i) [2 X E aNext 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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