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這里第一版標準和第二版標準在Clearance上的算法有很大的不同,舊標準一般不用內差法即可,但新標準是需要的 請見下面此處的對比:; |, h! J+ O3 C6 F; u2 R5 \( [) J( E
For PRIMARY CIRCUITS operating on nominal AC MAINS SUPPLY voltages up to 300 V, if the PEAK WORKING2 {" ?3 p; K6 a3 I
VOLTAGE in the circuit exceeds the peak value of the AC MAINS SUPPLY voltage, the minimum
* _3 X9 C0 b% z. \7 ~3 J; X" Z* d' Z* cCLEARANCE for the insulation under consideration is the sum of the following two values:' R( e; F9 E1 G' r5 P
– the minimum CLEARANCE value from table 2H for a WORKING VOLTAGE equal to the AC F0 ? i2 g% [" e8 ~
MAINS SUPPLY voltage; and7 Q# K4 J: E4 n- s% H
– the appropriate additional CLEARANCE value from table 2J.9 G8 D: `7 G: y N) j+ a7 K
(舊標準)
* |7 Z/ o5 O0 R: e. w3 RFor an AC MAINS SUPPLY not exceeding 300 V r.m.s. (420 V peak):7 H( o, m$ V+ O3 o; m( D5 E
a) if the PEAK WORKING VOLTAGE does not exceed the peak value of the AC MAINS SUPPLY7 p' W, w& ?/ V; C0 [
voltage, minimum CLEARANCES are determined from Table 2K;6 T0 x1 y; N' A. w' n+ `0 H6 [0 `) x
b) if the PEAK WORKING VOLTAGE exceeds the peak value of the AC MAINS SUPPLY voltage," B5 U" _4 g# M& c8 L9 r
the minimum CLEARANCE is the sum of the following two values:1 R0 n+ \% `0 k t/ W3 d
• the minimum CLEARANCE from Table 2K; and
; i8 t4 g( t; j# E g% z" i9 s• the appropriate additional CLEARANCE from Table 2L) n4 a* b! L% u( {# d N Z
(新標準)
" `9 T3 f B9 Z- S3 K+ {& n6 u所以Clearance相對新標準嚴苛些了. |
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