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

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DSH 380

Affect of solder resist on Comparative Tracking Index (CTI) of Printed Wiring Boards

2.9.3, Table 6, Condition 3

60950(ed.2) & 60950(ed.3) $ A7 _, N" h: r  Y3 j

5 N9 K1 a! K: {0 f% A  h$ v4 r6 zStandard:
) S. C) `1 }  d$ jIEC 60950, 2nd and 3rd Ed.
& L2 i* c( l' z) A- @* ZSub clause:
# ~0 m; @0 e" U2 {2.9.3, Table 6, condition 3
" @3 i* ?. T# c) d/ a5 u- q; o- }/ eSheet n. 380
Page 1 (1)
Subject:
Affect of solder resist on
Comparative Tracking Index (CTI)
; A% n, g- x% d6 A) P. |of Printed Wiring Boards
9 \4 d5 h" ?+ n3 z) J# I0 }) F3 [0 j' {Key words:
-comparative tracking index
1 y: }) Y# I  a4 g# D  p-CTI
-printed wiring boards
-PWB
-solder resist
! J" }3 @" @8 m+ fDecision confirmed
* @' m+ K6 `2 ~+ P& cat CTL 38th meeting
  v- I$ V: e4 R, E) kQuestion:
( H! ]/ `+ J* GThe measured Comparative Tracking Index (CTI) for a printed wiring board with solder
/ S* M  }3 a! \# R& q: _7 Nresist present can be different than that for the printed wiring board without the solder resist.
# M; M* _! [9 D7 j+ eThe creepage distances required in the standard depends upon the CTI for the printed wiring
& q; o5 Q* L6 }: oboard.
Should 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?
Note – Clause 2.9.5 does not apply to this question because the assembled printed wiring
7 |& @- s( p6 M- a7 \board is not covered with a conformal coating.
Decision:
, l! U( ~+ ~) s4 f# I0 a6 [$ \Yes.
  {; w7 q- c  I/ G" a& u! W