Sheathed Heating Elements 9 H4 |& Q1 g; N: C. A! }
19.11.2- m0 N5 f( n9 m2 O7 U
60335-1(ed.3) ) Z5 w4 j/ R! Q7 ~
# h$ k# H2 T. M! I! P; `3 b: _Standard: IEC60335-1:1991, 3rd Ed." v ?# L6 _& F) r
Sub clause: 19.11.2 2 l8 X+ o9 L6 q7 J# H; w6 U; i8 KSheet n°: DSH-441A 8 l. X. c1 e8 R6 TSubject: Sheathed Heating Elements1 V& y' u' y0 X! T5 F6 B
Key words: - Abnormal, sheathed element - Protective electronic circuit0 z; S4 ?0 d( O. h
Decision taken during the 41st CTL meeting 2004 and modified at the 42nd CTL meeting 2005* c6 ~' {3 @8 c# V3 ]1 q/ G
Question: Some appliances have the following circuit+ h# k0 t4 w5 H4 e0 {
In Clause 19.11.2, it is stated that, if an electronic circuit operates to ensure compliance with & ]1 H* m* S: P# Fclause 19, the relevant tests of clause 19 should be repeated with a single fault simulated as( {) C9 ?6 ]6 i7 @0 m1 V
in a) through f) of cl.19.11.24 H3 s* d/ O0 } P$ X2 w
In our opinion (VDE), an additional mechanical thermal cut-out is required. ( @5 k. h6 E% {2 k3 X8 MConvenors note: 9 s$ k6 X' S! k- g' U4 T# N9 U) wIn clause 19.5, the electronic thermostat will operate to limit the temperature in one 7 i& t1 b2 j. m3 E3 \! mconfiguration. The enquiry asks, if a single fault prevents the thermostat operation, is an7 d: ^9 A6 ]% @
additional cut out required to comply with 19.5 * C8 {# d1 b$ D6 @; RDecision:* g) b" f. Y# s
An additional thermal cut-out is required* _5 p8 X* o" |, y5 s
Note: This is only applicable to the above mentioned standards and is not applicable to " C& t; U/ Z- O* {$ i" QIEC60335-1(4th Ed. with Amendment 1).2 }+ x3 T' E$ N9 e4 P& S
[attach]75937[/attach] 5 t2 }7 U, W$ A , a: M7 d0 W/ N& F: q% @
DSH 441A