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

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DSH 281 2 ~. e8 \# K5 v4 f7 q" P& w

Open circuit of conductor of PCB during tests of clause 19

19.11.2

60335-1(ed.3)

7 I  U3 |' o) H5 ^Standard: IEC 60335-1, Ed. 3.0 Sub clause: 19.11.2 Sheet n. 281
Page 1(1)
Subject: Open circuit of conductor
of PCB during tests of clause 19
Key words:
- PCB
; Y! W8 L+ {1 j9 s" ~! W( WConductor
& {3 d: ~* y1 m* DDecision n. 20 taken
At 36th meeting/1999
Question: When conducting test of sub-clause 19.11.1 one conductor of PCB blow up
Taking into account that:
0 m+ w+ N( b+ Z% L9 t8 E- the material of PCB withstands the burning test of sub-clause 20.1 of IEC 65,
6 ]' ]& o& l: c  X3 E5 s: K- there are no loosened conductor which reduces creepage distances and clearances
" z! P3 W# @- h% Z, Wbelow the required values
; \" P! M5 ]2 x7 c5 M- when the test of sub-clause 19.11.2 is conducted with the open-circuited conductor
bridged, an other part of the PCB blow up,
% T0 ?3 K& `0 O4 l% T! `: aare 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
- g5 t) G6 @* ]) ^! X8 nsame conductor blow up (according § 19.1 6th paragraph), and if the conductor is
2 {$ b- F: k, j& J0 f$ {defined by the manufacturer like a specially designed weak part.
3 l8 y- w( f5 Q