DSH 441A Sheathed Heating Elements

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DSH 441A & ^1 N) K5 V! n: [9 J: [

Sheathed Heating Elements 3 M6 ]* S6 `3 f$ B" T% W7 N' }

19.11.2

60335-1(ed.3) 9 x- X2 j3 {9 a* ^. B

Standard: IEC60335-1:1991, 3rd Ed.
Sub clause: 19.11.2
/ y# E, u/ ]( N/ D7 e1 O6 }4 Y1 |* H: tSheet n°: DSH-441A
! M) c/ r# H( x+ u6 ^# ]8 uSubject: Sheathed Heating Elements
Key words: - Abnormal, sheathed element   - Protective electronic circuit
3 a- F3 L9 @7 n8 VDecision taken during the 41st CTL meeting 2004 and modified at the 42nd CTL meeting 2005
0 l' r9 i+ i. n1 ~Question: Some appliances have the following circuit
+ K! J5 U+ N/ L, D0 T- |In Clause 19.11.2, it is stated that, if an electronic circuit operates to ensure compliance with
8 a7 r' y" ^! h. b$ d1 x+ _5 Zclause 19, the relevant tests of clause 19 should be repeated with a single fault simulated as
% q3 r5 U4 R* X0 W, q; i: xin a) through f) of cl.19.11.2
In our opinion (VDE), an additional mechanical thermal cut-out is required.
Convenors note:
In clause 19.5, the electronic thermostat will operate to limit the temperature in one
configuration. The enquiry asks, if a single fault prevents the thermostat operation, is an
! m) n7 G$ J# f" @6 ^- h5 x1 fadditional cut out required to comply with 19.5
Decision:
( w' @( k. V" S. m8 vAn additional thermal cut-out is required
6 [; Z& M) X$ rNote: This is only applicable to the above mentioned standards and is not applicable to
IEC60335-1(4th Ed. with Amendment 1).

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