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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)。0 E1 L8 `( Z: `. `1 Z4 C0 g
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 ^" l* m$ I N/ j第二步：器具是 is in overvoltage catergory II,* z$ ~% U, W' D7 b9 n" `0 u
rated voltage 假定220-240V, so the overvoltage is 2500V.
6 `& x; I% d+ jstep 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' o0 V/ }8 w+ Z9 m# R
For supplementary insulation, it is same with basic insulation
- |8 g; o; F) m$ a; R For reinforced insulation, the higher step limit apply from table 16, that means the value for Overvoltage 4000V applies, it is 3.0mm1 Z# k# w1 Y. {- \
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step 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." T4 X i$ O! L) h
there are two limit existed, 4.0mm for general basic insulation and 1.0mm for tubular heater.7 g7 f& b! E0 z& P) O9 S
Supplementary insulation is same with basic general requirement
5 T- v6 g+ z6 ~9 QReinforced insulation is double the basic insulation.
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Please Bear in mind, above analyse is based on Class I.5 d8 r X" F8 b0 S
0 _) {; P. D- A* |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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