DSH 380 Affect of solder resist on Comparative Tracking Index (CTI) of Printed

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DSH 380 / k' j2 ~& |. T& ^, d# ?1 d

Affect of solder resist on Comparative Tracking Index (CTI) of Printed Wiring Boards 7 v$ `) q: T. n; r2 V, l' C+ O; U

2.9.3, Table 6, Condition 3 % \8 U" f+ A: d( `3 F

60950(ed.2) & 60950(ed.3)

2 Y. l7 [7 J4 O2 }+ Y0 l, ^$ S1 @Standard:
IEC 60950, 2nd and 3rd Ed.
Sub clause:
* q& J" W$ \: v& L7 V6 @8 ~! Y7 @2.9.3, Table 6, condition 3
1 I9 ~/ D  j; q! {# Q4 i0 G8 TSheet n. 380
( z/ A# R  V1 `, l- p- tPage 1 (1)
Subject:
Affect of solder resist on
3 Y& p( f1 q+ ]) I; F5 |5 u$ J1 mComparative Tracking Index (CTI)
; \, k' `. c. }of Printed Wiring Boards
9 y( ^4 q3 A  {6 X* ]$ Z& nKey words:
-comparative tracking index
-CTI
- X. \9 @3 V% f& ?-printed wiring boards
-PWB
-solder resist
4 x8 f" Q! y1 |3 _+ T1 a4 @; [. yDecision confirmed
at CTL 38th meeting
# A" \# x4 d3 r$ L$ K. a  ~2 {Question:
The measured Comparative Tracking Index (CTI) for a printed wiring board with solder
resist present can be different than that for the printed wiring board without the solder resist.
3 q4 p: o) ]; s: F$ N  x7 @+ z' DThe creepage distances required in the standard depends upon the CTI for the printed wiring
* }; [8 R' g1 I: \# o3 r* Dboard.
! i& V  R$ {  Q3 H; aShould the presence of solder resist on a printed wiring board be considered in determining
the CTI when determining the creepage distances requirements to be applied?
7 A2 q2 c4 ]+ Z& E$ ]4 DNote – Clause 2.9.5 does not apply to this question because the assembled printed wiring
7 b6 ?2 @4 O% f$ X4 k8 Mboard is not covered with a conformal coating.
Decision:
Yes.


# s: M+ K0 V! [, y4 [