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发表于 2013-10-12 10:14
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我在旧版的标准中有看到不同的描述:
& z3 p6 c; i2 q7 W' ?2.10.5.3 Printed boards2 C+ V6 k7 [1 Z( A3 R8 L C `
For the inner layers of multi-layer boards, the distance between two adjacent tracks on the same" y2 e1 O. a/ [0 Z
layer of a printed board is treated as distance through insulation (see 2.10.5.1).% E4 i6 T4 e# s8 \0 @
. F! t. H$ B5 Y: I4 [7 U. R1 p5 _内层距离当成是绝缘穿透距离。1 X( _, ?# U7 i- x
/ m4 g/ T- t; [9 a5 X# z/ }2 w
但新标准已经对这部分做了修改,改为4 x! s, N* ?9 r- S, @# J5 N
2.10.6.3 Insulation between conductors on the same inner surface of a printed board/ u& b A$ e2 s) |& }! L5 J) M
On an inner surface of a multi-layer printed board (see Figure F.16), the path between any two
$ @' W: {# e! Lconductors shall comply with the requirements for a cemented joint in 2.10.5.5
6 X7 Y: V0 s* n) ~2.10.5.5 Cemented joints
3 q* x9 w \+ {) {$ B( a' |% WWhere the path between conductive parts is filled with insulating compound, and the insulating o, |# m3 y, F2 E
compound forms a cemented joint between two non-conductive parts (see Figure F.18) or& [8 L4 \+ m) x, G+ {
between a non-conductive part and itself (see Figures F.16 and F.17), one of the following, a),. C" h3 h$ M K( Y6 m+ V. J% }
b) or c) applies.: u+ f9 a5 i/ n+ Q" p) |1 e2 k
a) The distance along the path between the two conductive parts shall not be less
/ x% {# i" Z' W& {, n5 q) pthan the minimum CLEARANCES and CREEPAGE DISTANCES for Pollution Degree 2. The
# e& g0 m* U0 O3 I' k' e' \+ ^requirements for distance through insulation of 2.10.5.2 do not apply along the joint.b) The distance along the path between the two conductive parts shall not be less4 v1 Q' t8 j1 `
than the minimum CLEARANCES and CREEPAGE DISTANCES for Pollution Degree 1.' D' a5 O. {9 W Z& j
Additionally, one sample shall pass the test of 2.10.10. The requirements for distance
$ D, u' F, J: F% S* l$ j; O( M Nthrough insulation of 2.10.5.2 do not apply along the joint.
2 E8 F3 c+ W" @1 j2 @c) The requirements for distance through insulation of 2.10.5.2 apply between the
9 Z! E& K# f+ Qconductive parts along the joint. Additionally, three samples shall pass the test of; B1 ?* x' B' D1 W; Q
0 Z6 F1 j2 h m我们公司一般应用的是2.10.5.5中的a),6 `( `' b. a+ H0 r& l
所以在新的标准里,内层的距离和外层的绝缘距离是相同的。
' S* U" ?6 i& E+ z0 r, d6 v) j! g. P/ s6 O+ ?) n; _
请高手指教,我的理解是否正确。 |
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