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- E, {2 u/ h( ~7 n! oStandard: IEC60335-1:1991, 3rd Ed.
( G# q/ @* w; n' RSub clause: 19.11.2% A5 q* J( F n
Sheet n°: DSH-441A
) p: g% i8 G* n: `& \% y! aSubject: Sheathed Heating Elements3 b' |2 N6 [4 @ I
Key words: - Abnormal, sheathed element - Protective electronic circuit
% f3 b1 @7 l9 C0 ~Decision taken during the 41st CTL meeting 2004 and modified at the 42nd CTL meeting 2005% p. ]9 _0 b G1 C/ @! \
Question: Some appliances have the following circuit% [: m7 N- H& Y# }) E6 B9 T0 I
In Clause 19.11.2, it is stated that, if an electronic circuit operates to ensure compliance with
+ n( H9 h% p( X5 M' y. ]clause 19, the relevant tests of clause 19 should be repeated with a single fault simulated as
. N7 M4 Y. b0 T7 [in a) through f) of cl.19.11.2$ d5 B% o) W( X G
In our opinion (VDE), an additional mechanical thermal cut-out is required." C+ u& p7 ^6 h: K1 w
Convenors note:: P. K9 a3 P8 B" U6 y7 [4 o
In clause 19.5, the electronic thermostat will operate to limit the temperature in one* _5 r) [: F# ]$ Z0 H' ]) m) ]
configuration. The enquiry asks, if a single fault prevents the thermostat operation, is an
7 r9 `" y8 i% N, z( t7 J" F1 [additional cut out required to comply with 19.5
5 M" A \1 V& A3 q6 l& s! L: PDecision:9 A$ |4 h3 ~- g8 e2 Y
An additional thermal cut-out is required
: A* h9 l# w4 f. a: rNote: This is only applicable to the above mentioned standards and is not applicable to, ~. q5 E. T) X u$ u
IEC60335-1(4th Ed. with Amendment 1).0 v! p7 l$ G0 j2 d
. h& q+ Q7 e0 F! O6 k7 q! j2 h) H1 d) K/ U ]5 n$ G" s
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发表于 2012-9-14 13:03
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