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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)。
" G: l% H# C* V9 Z/ S: `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.
8 Q8 A" z6 H3 \9 r" L第二步：器具是 is in overvoltage catergory II,6 z* y7 j8 V4 C
rated voltage 假定220-240V, so the overvoltage is 2500V.# w( z& k/ _4 A' A
step 3: for cr (see table 16)
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# o7 i' Q! X) ~' S z3 q For basic insulation (clearance), there are two limit existed, 1.5mm for general basic insulation and 1.0mm for tubular heater/ H! p% {; c3 t% p
For supplementary insulation, it is same with basic insulation2 v' D+ P# n- q, `( y) H
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
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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.# y b1 @/ L# p- _
there are two limit existed, 4.0mm for general basic insulation and 1.0mm for tubular heater.
* v' e1 g" Z. _1 U6 eSupplementary insulation is same with basic general requirement1 E9 i6 J7 s, i1 ^- o% O8 A
Reinforced insulation is double the basic insulation.
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9 i; l( }/ S; M% c* w6 E) YPlease Bear in mind, above analyse is based on Class I.8 I+ }- n2 E3 n5 W, @$ \" d% E, x
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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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