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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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+ N; ^# X( `- b/ {; `9 I5 a) V, h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)。
3 u" {2 w" Y7 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./ O9 a7 F: ^, J! a' e" D, m( @
第二步:器具是 is in overvoltage catergory II,2 c' j1 x0 q9 [ E+ s
rated voltage 假定220-240V, so the overvoltage is 2500V." O/ I( M/ O# K
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 heater
" B z2 F V# a2 U For supplementary insulation, it is same with basic insulation
5 _1 i$ o8 F; H& 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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4 W# H! k ]2 x) n I& }step 4: For Creepage
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/ [2 v4 q4 Y9 z( x" lfor 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.
6 V; m8 ]$ q8 K8 \4 J2 l& ^% N8 Qthere are two limit existed, 4.0mm for general basic insulation and 1.0mm for tubular heater.
3 A. h, n) o* zSupplementary insulation is same with basic general requirement) x# g8 j$ c7 h$ B
Reinforced insulation is double the basic insulation. i- q! Z, Z$ e$ G6 L) r( g e
2 M, \' a4 L# u; G7 S$ sPlease Bear in mind, above analyse is based on Class I.4 G M: T' g% `9 G' W# \
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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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