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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)。
9 H2 g& X6 _7 C. i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.2 c/ t- U4 o/ `/ Q) }2 q$ S; ~; _
第二步：器具是 is in overvoltage catergory II,
# S6 ~* Q2 n+ c5 b7 S) l" W rated voltage 假定220-240V, so the overvoltage is 2500V.
' y! X- D- A! A% |+ C' A/ ]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 heater7 q9 c- l- a+ c! q
For supplementary insulation, it is same with basic insulation
2 w' Z% y" W; d7 `8 G2 N/ {4 t 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 / R" L" x8 z) N! L4 i+ c: D! ^
/ R' C" k' S5 y1 L5 ffor 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.
- z" e6 X. F( z4 I+ i8 C) K6 bthere are two limit existed, 4.0mm for general basic insulation and 1.0mm for tubular heater.
! \: {" A7 R5 `' U/ \Supplementary insulation is same with basic general requirement' i4 l2 }0 V' |2 B7 P* O
Reinforced insulation is double the basic insulation.. q7 M+ K+ n2 x% a- e
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Please Bear in mind, above analyse is based on Class I.: ?& o8 f# D$ K. P9 Q
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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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