DSH 441A Sheathed Heating Elements

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DSH 441A

Sheathed Heating Elements . Y- X3 ~( G; l$ `% W) Y

19.11.2 / T, g* T; ?( C: g  v. G8 Y, Y

60335-1(ed.3) 6 Y2 V+ K: s2 Q% m4 E0 D) W  M

Standard: IEC60335-1:1991, 3rd Ed.
7 B6 l0 Q4 g3 {7 a6 vSub clause: 19.11.2
Sheet n°: DSH-441A
Subject: Sheathed Heating Elements
) f4 e& [3 J: }3 R  Y1 h( W' J5 dKey words: - Abnormal, sheathed element   - Protective electronic circuit
Decision taken during the 41st CTL meeting 2004 and modified at the 42nd CTL meeting 2005
4 P$ Q  b! O8 P/ a9 Z* J* G! e) lQuestion: Some appliances have the following circuit
2 P/ z( P* M# W; \3 C% WIn Clause 19.11.2, it is stated that, if an electronic circuit operates to ensure compliance with
: g0 V. v3 s% `5 Nclause 19, the relevant tests of clause 19 should be repeated with a single fault simulated as
in a) through f) of cl.19.11.2
In our opinion (VDE), an additional mechanical thermal cut-out is required.
Convenors note:
/ k9 r' q- k4 X6 q0 X7 tIn 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
additional cut out required to comply with 19.5
Decision:
$ E! l- P- o' EAn additional thermal cut-out is required
9 z7 w8 k! i+ d( k1 |Note: This is only applicable to the above mentioned standards and is not applicable to
IEC60335-1(4th Ed. with Amendment 1).