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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。3 g+ Q- k4 z5 @. f. _5 E/ O
, X8 i( I1 u) L" ^2 P& o9 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)。5 o' ~6 J2 V+ c. {: i; f
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.
' Y, }& l# j$ }. Z: x4 E% n第二步：器具是 is in overvoltage catergory II,
1 b! _: K1 S+ M# u& a; i r+ z rated voltage 假定220-240V, so the overvoltage is 2500V.
3 a+ H$ Q! ~4 Y7 C# `4 I Q+ Sstep 3: for cr (see table 16)+ Z o* R2 f. L3 a! q& j
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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
, Q- A& t# d/ q9 K% b+ C For supplementary insulation, it is same with basic insulation% f9 k+ ?# |. ?- R+ D
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
- E2 z+ `# I3 g' Y0 `! y+ V) {) S& 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.1 O* q/ h; t1 z* ]
there are two limit existed, 4.0mm for general basic insulation and 1.0mm for tubular heater.! i% z9 f' W) t; m% T$ s* t2 J
Supplementary insulation is same with basic general requirement
- ^( C) k. K. i% f7 a* a1 p- @" dReinforced insulation is double the basic insulation.: y, |5 P" `& b' a0 w
% O% V% E0 m1 \9 u. f
Please Bear in mind, above analyse is based on Class I.. t; d% l3 r7 q, T$ _
- J6 L7 s7 W9 R( [: HNext 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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