DSH 281 Open circuit of conductor of PCB during tests of clause 19

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DSH 281 # `/ l3 s; F3 e1 `2 n

Open circuit of conductor of PCB during tests of clause 19 * {7 h. x* `4 }8 {  L. M% Q

19.11.2

60335-1(ed.3)

* A  b( V% D2 ZStandard: IEC 60335-1, Ed. 3.0 Sub clause: 19.11.2 Sheet n. 281
9 y: |- N" k, _; D9 VPage 1(1)
' {3 K! L( u3 ?1 [& ]6 m7 j+ wSubject: Open circuit of conductor
. d5 z- f* C9 b2 e* k" Cof PCB during tests of clause 19
4 R1 j- l9 p3 NKey words:
- PCB
Conductor
Decision n. 20 taken
At 36th meeting/1999
/ ~3 Z" a2 r% p3 g  E5 H, YQuestion: When conducting test of sub-clause 19.11.1 one conductor of PCB blow up
Taking into account that:
) z4 }4 C1 |7 N0 q8 i- the material of PCB withstands the burning test of sub-clause 20.1 of IEC 65,
# b. E' ?" ~( ^2 X4 c6 C2 g- there are no loosened conductor which reduces creepage distances and clearances
  ?- V; r; X/ z! Y& ibelow the required values
- when the test of sub-clause 19.11.2 is conducted with the open-circuited conductor
6 E0 X) O$ \7 m" |5 Bbridged, an other part of the PCB blow up,
" [  M4 R. M; Gare the requirements of sub-clause 19.11 fulfilled?
9 t! r& G2 F& P1 V9 rDecision: The circuit complies with the clause of the standard, if the conductor of the
/ R* L  A; \* v! E# u: cPCB is considered as a intentionally weak part of the circuit.
This can be verified by performing the test on another sample and verify that the
, d1 I# ], ^: zsame conductor blow up (according § 19.1 6th paragraph), and if the conductor is
9 n7 ?3 Y; k/ i3 w. E& Z' e* F- sdefined by the manufacturer like a specially designed weak part.
3 _( {3 S: }2 F