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

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DSH 281 2 {8 @6 M1 p# Y3 C4 x

Open circuit of conductor of PCB during tests of clause 19

19.11.2 # i/ r1 S6 C  D  A9 a

60335-1(ed.3) - g6 z# R; I) G" Q

$ Q0 \  B4 L) W0 _  h5 _Standard: IEC 60335-1, Ed. 3.0 Sub clause: 19.11.2 Sheet n. 281
- L7 K- U2 @; o5 E& U. o/ dPage 1(1)
$ [5 S) H. g( }7 \Subject: Open circuit of conductor
" \# ^& ?. `# ]+ ]  zof PCB during tests of clause 19
0 T4 }4 r! R9 Y! t, B" V1 XKey words:
- PCB
Conductor
Decision n. 20 taken
At 36th meeting/1999
Question: When conducting test of sub-clause 19.11.1 one conductor of PCB blow up
& c; c- }8 _  _) J; MTaking into account that:
- the material of PCB withstands the burning test of sub-clause 20.1 of IEC 65,
- there are no loosened conductor which reduces creepage distances and clearances
below the required values
- when the test of sub-clause 19.11.2 is conducted with the open-circuited conductor
# W) ~) J- T* ^) {# l1 Qbridged, an other part of the PCB blow up,
are the requirements of sub-clause 19.11 fulfilled?
Decision: The circuit complies with the clause of the standard, if the conductor of the
PCB 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
1 i$ A3 k. ^) `- t% _/ Nsame conductor blow up (according § 19.1 6th paragraph), and if the conductor is
% Y! E  ~8 P" d0 K  z& U8 ?4 odefined by the manufacturer like a specially designed weak part.