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| DSH 2814 |* F+ P' f: p: e5 o
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| Open circuit of conductor of PCB during tests of clause 197 `: c" y) Z7 G
| 19.11.2$ U, j5 q R( Y" \/ |- u
| 60335-1(ed.3)
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1 |2 g: s3 o4 B7 NStandard: IEC 60335-1, Ed. 3.0 Sub clause: 19.11.2 Sheet n. 281
; N) j( o/ L( r1 VPage 1(1)
) X% B/ z E# k3 W; G0 sSubject: Open circuit of conductor/ U% N y. q7 L4 x* b) A# r
of PCB during tests of clause 19$ V5 ]! p: V$ i k# e H' Q: w
Key words:
7 Q# H# D- V/ X( S2 A- PCB
" d) P7 k! f, w9 U$ Y. i" _) p$ z- QConductor
! I; ]$ V- y) e! c/ J3 FDecision n. 20 taken
7 }3 d8 I, S W/ @9 nAt 36th meeting/1999) ^& a) O; V& J9 `8 _6 H0 H& x: w
Question: When conducting test of sub-clause 19.11.1 one conductor of PCB blow up
7 ^# Z. {& m/ C' gTaking into account that:" v n; q1 W7 o7 L" a4 [
- the material of PCB withstands the burning test of sub-clause 20.1 of IEC 65,& Q2 R& J1 X6 G9 A% w; w w
- there are no loosened conductor which reduces creepage distances and clearances
7 h, g, S; r( Y, K; D5 Cbelow the required values: s) V7 Q8 O) M& F% d* ?, q+ H
- when the test of sub-clause 19.11.2 is conducted with the open-circuited conductor9 v; R1 a" K K" H- B7 ^, M
bridged, an other part of the PCB blow up,
$ h. S! j% L- M" d5 F# nare the requirements of sub-clause 19.11 fulfilled?
6 c, O* d7 n0 |! @ V- R( sDecision: The circuit complies with the clause of the standard, if the conductor of the
8 Z5 {; Q& ]- L: }. TPCB is considered as a intentionally weak part of the circuit./ v, j" k/ t* l5 v. \! V
This can be verified by performing the test on another sample and verify that the
# g* r6 D* r9 v6 ~' z H7 _9 \same conductor blow up (according § 19.1 6th paragraph), and if the conductor is2 u* I9 e* Y/ ?' C& w- E% X4 I
defined by the manufacturer like a specially designed weak part.- X) h. m( W5 Y2 l+ n" m: I" r
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