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

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DSH 281 2 x$ A3 u- J" [/ t

Open circuit of conductor of PCB during tests of clause 19 8 k- I9 K' ~, z

19.11.2

60335-1(ed.3)

% y3 `# O$ n2 eStandard: IEC 60335-1, Ed. 3.0 Sub clause: 19.11.2 Sheet n. 281
Page 1(1)
2 L- w8 A' p3 |" ]- aSubject: Open circuit of conductor
of PCB during tests of clause 19
Key words:
- PCB
: p* ]2 ]$ S- I. vConductor
Decision n. 20 taken
* V$ y# W; ^) u. b  {- gAt 36th meeting/1999
; s' G: n0 Q# s' _Question: When conducting test of sub-clause 19.11.1 one conductor of PCB blow up
Taking 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
% v$ _- k1 V/ [9 rbridged, 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
3 x8 S  ?5 L3 A  U) d) uPCB 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
% I" |. Y: G% {2 q  @4 nsame conductor blow up (according § 19.1 6th paragraph), and if the conductor is
defined by the manufacturer like a specially designed weak part.
! h0 t! W6 _+ D% r" @% J$ H! ~