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|  DSH 441A
7 V8 c& }& @* L: n: u! G' }8 `' h( Z3 E5 l; y/ d
| Sheathed Heating Elements
: `3 N; G+ F$ P3 b' }0 d! T | 19.11.2
. V2 l. K0 O# [ R: X1 I4 L | 60335-1(ed.3)
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Standard: IEC60335-1:1991, 3rd Ed.) l' I7 o& n) r8 L
Sub clause: 19.11.2+ e( F4 w% m4 ?4 W; e
Sheet n°: DSH-441A
: C9 [% p' G4 b( q3 s) o0 ESubject: Sheathed Heating Elements
0 w" z8 z) A& E1 O8 SKey words: - Abnormal, sheathed element - Protective electronic circuit6 b3 b( T1 R/ G& A
Decision taken during the 41st CTL meeting 2004 and modified at the 42nd CTL meeting 20050 h- o3 [' S% q- H$ _; o3 n
Question: Some appliances have the following circuit* [- W2 c* Q( N4 k
In Clause 19.11.2, it is stated that, if an electronic circuit operates to ensure compliance with
7 a) W. ^( N8 l( Jclause 19, the relevant tests of clause 19 should be repeated with a single fault simulated as
8 T1 R. _ J" i0 n$ I; Sin a) through f) of cl.19.11.27 G3 A- h7 q( F* g
In our opinion (VDE), an additional mechanical thermal cut-out is required.
3 l/ V1 S: F2 x" f$ |% a# [Convenors note:
+ y: B- ]2 j! Z0 B+ y$ R UIn clause 19.5, the electronic thermostat will operate to limit the temperature in one- T8 a2 S' U( [# f4 j' l8 \
configuration. The enquiry asks, if a single fault prevents the thermostat operation, is an
6 ^; c( F) Q3 z! Zadditional cut out required to comply with 19.5 M; S% q* T& _4 H: C& x
Decision:: }1 ^* O$ l$ H0 [8 T* P
An additional thermal cut-out is required
; ^& z) Y8 c: x6 _Note: This is only applicable to the above mentioned standards and is not applicable to
/ d) i+ ]) s1 I( E1 p3 zIEC60335-1(4th Ed. with Amendment 1).
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