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| DSH 441A: }. H; q/ t9 r. ~
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| Sheathed Heating Elements3 G8 E! ^, p$ X
| 19.11.2
* b" j6 k- i: R5 C, v | 60335-1(ed.3)9 z' e" c' B) V ^* {
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Standard: IEC60335-1:1991, 3rd Ed.& ]+ b# j* E3 H, _: X4 b
Sub clause: 19.11.2# y1 J7 H5 z' o5 E. t& p. ~
Sheet n°: DSH-441A5 x4 ~6 G( r6 u. U( A$ u& e$ Z9 w
Subject: Sheathed Heating Elements; h, g/ |5 j* m
Key words: - Abnormal, sheathed element - Protective electronic circuit3 q) `9 o) \$ ]* I
Decision taken during the 41st CTL meeting 2004 and modified at the 42nd CTL meeting 20052 k7 d. B# Q; A3 [! A! L+ K
Question: Some appliances have the following circuit
. p3 `+ j( j1 s8 kIn Clause 19.11.2, it is stated that, if an electronic circuit operates to ensure compliance with
) h& p, ~1 ~, \- _/ |6 e6 T( w) O$ F& eclause 19, the relevant tests of clause 19 should be repeated with a single fault simulated as
& J- w+ L; }3 R6 n" I9 v: Bin a) through f) of cl.19.11.2
R& Q5 o) a) ~: TIn our opinion (VDE), an additional mechanical thermal cut-out is required.
, {; Q6 p. r$ V l$ N8 f# yConvenors note:
, {6 ?4 ]8 D) ?' v" CIn clause 19.5, the electronic thermostat will operate to limit the temperature in one
8 O8 b+ U. c7 a2 tconfiguration. The enquiry asks, if a single fault prevents the thermostat operation, is an
3 ]" U6 x) F/ \* C8 cadditional cut out required to comply with 19.5
4 F' t# [: d. |; C: @Decision:/ M" F2 F% N! x, j
An additional thermal cut-out is required
; Q' K' i; F8 y) kNote: This is only applicable to the above mentioned standards and is not applicable to+ C( h$ Y5 f7 H0 `0 g. L$ F
IEC60335-1(4th Ed. with Amendment 1).. b5 S' `- P8 t5 B; W! R% t# l+ b
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