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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:
$ z" g+ U/ \# t2.10.5.3 Printed boards
/ u8 Y8 T$ _5 f7 f9 ]For the inner layers of multi-layer boards, the distance between two adjacent tracks on the same% k) W2 p/ _# Z2 H
layer of a printed board is treated as distance through insulation (see 2.10.5.1).
7 d* n7 d) P# l& H4 P: F0 R$ H1 L# Y
内层距离当成是绝缘穿透距离。1 X" k" J% o( D3 f8 O, b4 R e% P: `
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但新标准已经对这部分做了修改,改为
6 M7 w: z& G6 D2.10.6.3 Insulation between conductors on the same inner surface of a printed board
+ r. h& f/ n( D3 b g% {On an inner surface of a multi-layer printed board (see Figure F.16), the path between any two, z& C, O, [ Y. t- V
conductors shall comply with the requirements for a cemented joint in 2.10.5.5" u+ U" x" b/ |! _4 Z+ J2 P: P
2.10.5.5 Cemented joints
3 a9 P! |6 x0 k7 V) c9 nWhere the path between conductive parts is filled with insulating compound, and the insulating& l; y8 P# W9 d
compound forms a cemented joint between two non-conductive parts (see Figure F.18) or
: _3 D) U& o2 r# n, c R4 ubetween a non-conductive part and itself (see Figures F.16 and F.17), one of the following, a),
: ]/ C4 Q: o/ zb) or c) applies.7 f* z) U9 X, I9 D4 K# H8 _
a) The distance along the path between the two conductive parts shall not be less. e" R2 [: M2 }7 ?+ X
than the minimum CLEARANCES and CREEPAGE DISTANCES for Pollution Degree 2. The
& H" J! Q' I0 x; z" mrequirements 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 less8 K: o8 F% t+ A
than the minimum CLEARANCES and CREEPAGE DISTANCES for Pollution Degree 1.
+ e3 M. o( k9 \$ K% PAdditionally, one sample shall pass the test of 2.10.10. The requirements for distance" P) i& ]( w/ m( ]
through insulation of 2.10.5.2 do not apply along the joint.
! Z$ n) D) c# t0 G5 pc) The requirements for distance through insulation of 2.10.5.2 apply between the
0 k" j" J6 t7 X0 V0 Hconductive parts along the joint. Additionally, three samples shall pass the test of* E. O% i( m" \& P
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我们公司一般应用的是2.10.5.5中的a),) B9 E1 G- J1 y% {; j7 k
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。
# P) F K/ G! Y9 I7 a
* d* E6 E0 f( Q) \) q请高手指教,我的理解是否正确。 |
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