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Standard: IEC60335-1:1991, 3rd Ed. * I; @4 N4 \' u1 x. wSub clause: 19.11.2 , w2 U8 h% m0 Q/ ]2 ^Sheet n°: DSH-441A $ J$ H6 z0 j" r z/ I; |Subject: Sheathed Heating Elements ) _1 c, k: Q' _" _7 eKey words: - Abnormal, sheathed element - Protective electronic circuit - i* ]( ?- m+ L( e8 e) ^! y: `1 w6 V% `Decision taken during the 41st CTL meeting 2004 and modified at the 42nd CTL meeting 20058 ?( G' a X% k
Question: Some appliances have the following circuit 8 T: R: h( \ r5 c0 R3 S0 b% ?) z& ~In Clause 19.11.2, it is stated that, if an electronic circuit operates to ensure compliance with6 n, J, D$ F( H1 t4 X9 o: p
clause 19, the relevant tests of clause 19 should be repeated with a single fault simulated as0 t* }$ H3 l, ?4 y/ ?
in a) through f) of cl.19.11.2" ~6 ~- X* x& Y( J" C0 R
In our opinion (VDE), an additional mechanical thermal cut-out is required.. G9 P# x" `, _9 {& G" ?6 @9 O
Convenors note:. T4 ]8 u, `, `5 q2 ^9 [2 s
In clause 19.5, the electronic thermostat will operate to limit the temperature in one. x V! V/ f# S" s
configuration. The enquiry asks, if a single fault prevents the thermostat operation, is an $ q+ a F6 @( \" C& eadditional cut out required to comply with 19.5 * y5 j4 b, ~6 \Decision: : t2 a \: a0 D3 m/ {An additional thermal cut-out is required4 {7 y# p7 |; F' E, E, x& I
Note: This is only applicable to the above mentioned standards and is not applicable to+ W7 [ o3 C" Y% t
IEC60335-1(4th Ed. with Amendment 1). - u. ]2 c! T& j* r[attach]75937[/attach] / Q! O% U) q/ V" t- g2 x$ a- Y L' [7 [
DSH 441A