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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。* s' C4 q c4 Y6 q7 I" ~
; t2 P7 Z( B% X9 @, c7 `$ _" k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)。! c% G6 y9 m0 y' V8 t' e9 d
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.; g9 l; J |2 O; g# |4 F, Q& D
第二步:器具是 is in overvoltage catergory II,3 v P# i" n J3 n) T3 e
rated voltage 假定220-240V, so the overvoltage is 2500V.
8 P' w, m% O. x$ i3 `step 3: for cr (see table 16), ~/ ?4 j# B+ z' i
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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! R8 I1 F( f8 p
For supplementary insulation, it is same with basic insulation6 K4 r: L* p) ~0 O7 f. i, W
For reinforced insulation, the higher step limit apply from table 16, that means the value for Overvoltage 4000V applies, it is 3.0mm% q0 a2 {8 n. i$ I1 x
! Y. P' I( x; ~4 M8 astep 4: For Creepage
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- P3 B- _, |8 w' h$ H/ f6 I+ ufor 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.
% f, J* X2 v# i' @# B% A7 x! \there are two limit existed, 4.0mm for general basic insulation and 1.0mm for tubular heater.
7 {. K _( b9 K- l/ n3 T% SSupplementary insulation is same with basic general requirement0 O; R- V& q7 _2 W* w* C1 g% i$ o
Reinforced insulation is double the basic insulation.4 I$ e2 g# |. G( q
4 }, h; z% b P0 M- \Please Bear in mind, above analyse is based on Class I.
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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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