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|  DSH 441A+ ~/ ]" @& p2 l2 z. R, @7 j
8 ]& q: |: t" |, n
| Sheathed Heating Elements! l7 J5 D j8 p6 S: T
| 19.11.2) v; h. S& b& z# O: K/ t) S5 Q
| 60335-1(ed.3)5 Q/ T" b0 M- C9 k) a3 p
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% P" @8 e9 l2 v0 x3 t1 p( aStandard: IEC60335-1:1991, 3rd Ed.) a0 Z' V/ l% |4 u
Sub clause: 19.11.2. b& t" I* g+ m, ~0 s4 T0 d
Sheet n°: DSH-441A
' B9 d l1 u, ]+ NSubject: Sheathed Heating Elements
6 t0 A& |0 s) `' {) \1 G* g- k' `) PKey words: - Abnormal, sheathed element - Protective electronic circuit
# ]5 Y2 n" r0 p1 E+ qDecision taken during the 41st CTL meeting 2004 and modified at the 42nd CTL meeting 2005# J5 u% z4 Q! U( ]: ~& i$ M1 V7 S
Question: Some appliances have the following circuit
6 x0 x) G2 G y) E: @In Clause 19.11.2, it is stated that, if an electronic circuit operates to ensure compliance with f" E$ Q4 L, D
clause 19, the relevant tests of clause 19 should be repeated with a single fault simulated as
- C/ w7 R8 Y% ?! d4 win a) through f) of cl.19.11.2
4 b& j. f1 w& P$ e; ^- {% DIn our opinion (VDE), an additional mechanical thermal cut-out is required.; A! N' Q7 N- H. m' G4 D" C% E- ^9 Y. m
Convenors note:8 o+ k1 u5 s m. W' F
In clause 19.5, the electronic thermostat will operate to limit the temperature in one
# u) ^. ]1 a+ d3 h" B' Q2 pconfiguration. The enquiry asks, if a single fault prevents the thermostat operation, is an
% ?6 n# m! f! e0 T+ D( yadditional cut out required to comply with 19.5
( I" c& @6 G* Q/ y' `8 q4 MDecision:
# T/ ?# R- \2 u/ N* kAn additional thermal cut-out is required6 w; `% ?; l2 d3 R7 w
Note: This is only applicable to the above mentioned standards and is not applicable to
. d& z& v8 B; [- Z4 z4 c* q' u% oIEC60335-1(4th Ed. with Amendment 1).+ I/ ]! ~6 i* }' m9 Y, @
+ ]5 e2 t, q9 K' @
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发表于 2012-9-14 13:03
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