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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:
& ^% A8 Z: V7 t0 z2.10.5.3 Printed boards
' v+ ^, M' r' n4 O' u% ^/ k' D: eFor the inner layers of multi-layer boards, the distance between two adjacent tracks on the same0 H2 M% Q+ s6 Q7 u/ @: R
layer of a printed board is treated as distance through insulation (see 2.10.5.1).
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内层距离当成是绝缘穿透距离。
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9 [& d. c% t3 X4 k但新标准已经对这部分做了修改,改为1 J) [* S) l u* O$ D ~
2.10.6.3 Insulation between conductors on the same inner surface of a printed board. s) f+ G6 [0 Y
On an inner surface of a multi-layer printed board (see Figure F.16), the path between any two% z; H' v$ k7 D4 H/ X2 {
conductors shall comply with the requirements for a cemented joint in 2.10.5.5
2 Z5 s- r0 k0 }5 {* ^. W* p$ b! F2.10.5.5 Cemented joints
. K) U0 A0 e8 K( j$ S8 YWhere the path between conductive parts is filled with insulating compound, and the insulating
( n' B5 R9 U$ p7 O R {2 }0 Xcompound forms a cemented joint between two non-conductive parts (see Figure F.18) or
. b) O9 O# X9 R7 ^- g; T- {between a non-conductive part and itself (see Figures F.16 and F.17), one of the following, a),/ j9 ]) L0 B9 e9 }
b) or c) applies." f2 S- X _1 V9 b
a) The distance along the path between the two conductive parts shall not be less) b* U' O: n" `8 a& u8 d9 l
than the minimum CLEARANCES and CREEPAGE DISTANCES for Pollution Degree 2. The& ^: o; U. ~! C- k7 c
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 less$ S7 j/ T s, q
than the minimum CLEARANCES and CREEPAGE DISTANCES for Pollution Degree 1.
' u: K R$ {0 _- uAdditionally, one sample shall pass the test of 2.10.10. The requirements for distance9 H. V, _- r+ d6 l
through insulation of 2.10.5.2 do not apply along the joint.9 S6 V, T8 i* c" U- x
c) The requirements for distance through insulation of 2.10.5.2 apply between the+ j8 j0 N& _5 d- v
conductive parts along the joint. Additionally, three samples shall pass the test of
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/ Q% w5 B/ W/ M8 P3 U我们公司一般应用的是2.10.5.5中的a),3 |6 z3 k7 R* F6 d) Z/ P3 M4 z; o2 q
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。
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请高手指教,我的理解是否正确。 |
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