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

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DSH 380 & c0 D- t" H. ]- O 4 n5 R4 W) u4 B: [  U

Affect of solder resist on Comparative Tracking Index (CTI) of Printed Wiring Boards ( Z7 ^* O6 `' h' E4 U/ c8 f4 I% h6 j

2.9.3, Table 6, Condition 3

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

Standard:
  v( u/ W+ V3 S/ T4 V3 ^% jIEC 60950, 2nd and 3rd Ed.
6 [0 B& j9 [/ g/ q; p' |Sub clause:
. i1 B' R/ N$ F1 p  [2.9.3, Table 6, condition 3
Sheet n. 380
& o" {! W% V2 ?1 pPage 1 (1)
Subject:
6 [4 q9 u) g! `Affect of solder resist on
% P+ r* j3 H5 t) `- u; _+ J1 e  cComparative Tracking Index (CTI)
" c7 w% o# W4 O- m& zof Printed Wiring Boards
& w0 B9 d- S7 QKey words:
-comparative tracking index
-CTI
1 P- _: {7 K3 g+ J, i0 o& ?+ X8 t-printed wiring boards
- }) M9 T4 p9 R. z# X-PWB
# b6 i' F( m& i. W/ \0 u-solder resist
Decision confirmed
9 \" t  ?; w9 j3 G$ Fat CTL 38th meeting
Question:
; K9 q8 y, E0 j8 HThe measured Comparative Tracking Index (CTI) for a printed wiring board with solder
4 r9 p: Y3 N  k& E3 k+ r: z! Lresist present can be different than that for the printed wiring board without the solder resist.
The creepage distances required in the standard depends upon the CTI for the printed wiring
& ^( i8 b; v7 X( c6 `& v. E( S3 jboard.
Should the presence of solder resist on a printed wiring board be considered in determining
9 ?. `6 B7 o6 [8 D1 b0 q, Y7 d9 d  Tthe CTI when determining the creepage distances requirements to be applied?
Note – Clause 2.9.5 does not apply to this question because the assembled printed wiring
+ ~; e0 t) b, e8 `board is not covered with a conformal coating.
  Q! D* K$ v/ h2 H0 V: b6 t% p# W8 fDecision:
6 v( j1 p5 |: ^Yes.


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