|
4 ~& `. h O6 P7 U3 f9 H
Standard: IEC60335-1:1991, 3rd Ed. q3 Z2 h1 `5 B) d' u ?3 R
Sub clause: 19.11.2
# g: T- H- l" G! U8 \6 p0 G1 |( SSheet n°: DSH-441A
& b+ @1 g; l$ Y& X3 H" g4 t: T7 VSubject: Sheathed Heating Elements0 P% v' Z( I( a$ q- }+ V5 B* J9 E: s
Key words: - Abnormal, sheathed element - Protective electronic circuit; c' |3 d- @. Z) l
Decision taken during the 41st CTL meeting 2004 and modified at the 42nd CTL meeting 20055 `6 Z' F/ _! e. z/ V9 @9 f; X( i
Question: Some appliances have the following circuit; j& j% j+ V: C8 h: V
In Clause 19.11.2, it is stated that, if an electronic circuit operates to ensure compliance with9 O, ]! @& M; A' ?0 Z
clause 19, the relevant tests of clause 19 should be repeated with a single fault simulated as `2 i$ p' k3 X6 }% _
in a) through f) of cl.19.11.2
# N& u; a0 }, G$ ^% V( K4 f bIn our opinion (VDE), an additional mechanical thermal cut-out is required.5 |: ]5 T0 m. a7 L: O0 }9 H
Convenors note:
9 Q1 N9 u) V" u: j8 |2 IIn clause 19.5, the electronic thermostat will operate to limit the temperature in one
2 A, l- x1 J1 e) Vconfiguration. The enquiry asks, if a single fault prevents the thermostat operation, is an
0 t! z, q1 b4 L/ nadditional cut out required to comply with 19.5 h4 M4 A" x, ^4 l* {
Decision:
5 `1 s6 n) Y9 j/ jAn additional thermal cut-out is required
/ y# M8 Z* { G( XNote: This is only applicable to the above mentioned standards and is not applicable to
1 ^3 P7 w, k/ E5 i6 G# PIEC60335-1(4th Ed. with Amendment 1).$ f5 [( n$ M" L) r& m) c
# g; R# M* |! ]' E1 ?' H; [+ H- `
* z! a; W! L) n( L$ H( M7 c$ q
|
本帖子中包含更多资源
您需要 登录 才可以下载或查看,没有账号?注册安规
x
|