|
| DSH 441A0 P( r% j9 M8 D# I6 B2 B
$ m: L4 J# {, D. {* @! w
| Sheathed Heating Elements% e" X# C% J9 l1 a+ h7 D, g& p
| 19.11.2
! J; n& e, i4 u5 V | 60335-1(ed.3)
9 O B5 x- r# n# I$ a' c | ! e' O* A) R1 C: e
Standard: IEC60335-1:1991, 3rd Ed.
8 B7 \3 k0 P7 X+ ZSub clause: 19.11.2
) Z. H! T5 Q- R0 e$ k1 X$ |5 jSheet n°: DSH-441A
; ?7 |4 v6 M' u- hSubject: Sheathed Heating Elements
2 z3 `, E' X6 w p" J8 c+ ~$ |# I% f0 qKey words: - Abnormal, sheathed element - Protective electronic circuit" i: r( L! q D% W$ s) |) v
Decision taken during the 41st CTL meeting 2004 and modified at the 42nd CTL meeting 20051 N/ T8 \4 c3 Z; W% k! v6 T) N
Question: Some appliances have the following circuit( L# Z# d: E/ w
In Clause 19.11.2, it is stated that, if an electronic circuit operates to ensure compliance with5 ?+ O& D6 i( o4 c! \$ D
clause 19, the relevant tests of clause 19 should be repeated with a single fault simulated as
% L4 [2 e2 c; v1 ]) @( y/ \in a) through f) of cl.19.11.2
1 c9 J- g- I; _* F4 b: eIn our opinion (VDE), an additional mechanical thermal cut-out is required.( C7 R6 z( f' s0 C3 [4 |
Convenors note:
8 W3 w6 r7 [" Q, y |In clause 19.5, the electronic thermostat will operate to limit the temperature in one
& _" [- ^% o! h* t2 ]configuration. The enquiry asks, if a single fault prevents the thermostat operation, is an
8 O1 N) }9 ]" G- V' |, @, S7 Vadditional cut out required to comply with 19.5
$ H: K5 x' {) l* G5 jDecision:
1 g: W0 m5 e* ]# pAn additional thermal cut-out is required! s- z$ w7 W0 Q% Q
Note: This is only applicable to the above mentioned standards and is not applicable to$ B$ G0 V. b' H9 K& l
IEC60335-1(4th Ed. with Amendment 1).) d, v+ |, e3 u
; y0 a( K) z8 K1 O4 `! s1 s) g( F# X3 ]7 J( c* J# k
|
本帖子中包含更多资源
您需要 登录 才可以下载或查看,没有帐号?注册安规
x
|