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| DSH 441A
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' K x/ q' m, E8 v | Sheathed Heating Elements
; h3 D+ w$ x6 H5 r) h$ N | 19.11.2
8 J& E5 B8 }8 ?4 ~1 w | 60335-1(ed.3)- @ v6 W8 u4 ?% G5 `' r3 i5 l- ~3 w
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Standard: IEC60335-1:1991, 3rd Ed.+ z+ ~. d8 }2 a$ s% @
Sub clause: 19.11.29 V* ?; t: M/ B) `
Sheet n°: DSH-441A* `- ~5 {7 N4 J2 @
Subject: Sheathed Heating Elements
% [( f4 S7 F9 N5 _Key words: - Abnormal, sheathed element - Protective electronic circuit2 O; E6 S2 ^1 P" _7 y- e7 q( I
Decision taken during the 41st CTL meeting 2004 and modified at the 42nd CTL meeting 2005+ `! o; y n$ p& P7 y
Question: Some appliances have the following circuit. z* _' }# }/ M) z
In Clause 19.11.2, it is stated that, if an electronic circuit operates to ensure compliance with8 i" d" @8 D8 l1 Y" o: @" K
clause 19, the relevant tests of clause 19 should be repeated with a single fault simulated as1 ~! u& k" Z8 z4 J; }5 }
in a) through f) of cl.19.11.2: l/ [9 w3 ]* Z6 {+ }
In our opinion (VDE), an additional mechanical thermal cut-out is required.
, o: y4 v& C# T0 J; @Convenors note:$ W# I) z* n: w8 i5 p7 L) n
In clause 19.5, the electronic thermostat will operate to limit the temperature in one
5 z5 ~" h: q0 _9 |: s/ }% Zconfiguration. The enquiry asks, if a single fault prevents the thermostat operation, is an; K! I5 d4 p( g7 [
additional cut out required to comply with 19.5
1 U4 N4 \' _* B8 B+ MDecision:
) p" ~1 ?' t/ j3 f) TAn additional thermal cut-out is required
; T5 c$ o1 ]: F/ ZNote: This is only applicable to the above mentioned standards and is not applicable to
. B; a* ^) q; r# B) {/ M& b& J- jIEC60335-1(4th Ed. with Amendment 1).
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