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

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DSH 281 6 H6 N! m* M. G* R6 k

Open circuit of conductor of PCB during tests of clause 19 3 b- N% U, W0 k0 n% m

19.11.2 + l+ G/ o% C; r8 s% v

60335-1(ed.3) 0 |. A! E, K- ^7 Q; o4 Z$ X

Standard: IEC 60335-1, Ed. 3.0 Sub clause: 19.11.2 Sheet n. 281
Page 1(1)
  e# U" l/ d  i7 I, h) t- ySubject: Open circuit of conductor
of PCB during tests of clause 19
Key words:
4 O9 e$ {* b0 g! @2 T& V% _( _- PCB
  V. O7 s( a( O! S' X( CConductor
. t0 x  Z8 `& T( S- ^6 R( R, _Decision n. 20 taken
0 C1 Q* A7 b$ ?At 36th meeting/1999
Question: When conducting test of sub-clause 19.11.1 one conductor of PCB blow up
1 v1 Q; B+ u" T4 K3 H) ^2 T6 rTaking into account that:
- the material of PCB withstands the burning test of sub-clause 20.1 of IEC 65,
& n; G2 e) Z! y$ x0 c+ J- there are no loosened conductor which reduces creepage distances and clearances
below the required values
/ M2 [' f9 z- y$ s5 @1 u& A6 z- 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,
1 j: X  Y" P% Z$ v5 C7 K; D) Iare the requirements of sub-clause 19.11 fulfilled?
' ~# c% h9 r7 G1 aDecision: The circuit complies with the clause of the standard, if the conductor of the
2 \( J; T9 N/ Y0 C& p- J7 yPCB is considered as a intentionally weak part of the circuit.
7 E( J% }% e9 p' @2 hThis can be verified by performing the test on another sample and verify that the
% S0 w% B% r/ wsame conductor blow up (according § 19.1 6th paragraph), and if the conductor is
+ J- ^7 z5 @" \; L6 f; a3 K1 l: {defined by the manufacturer like a specially designed weak part.

; L  q0 |6 a( G. D: K! f% D+ ]
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