DSH 441A Sheathed Heating Elements

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DSH 441A

Sheathed Heating Elements : @2 U, k, o0 M+ T4 f* v+ B

19.11.2

60335-1(ed.3) 8 r, M7 c: g, g4 s+ C

4 @5 d2 d: u! P" p# xStandard: IEC60335-1:1991, 3rd Ed.
Sub clause: 19.11.2
! z5 s( c" L+ P0 bSheet n°: DSH-441A
Subject: Sheathed Heating Elements
Key words: - Abnormal, sheathed element   - Protective electronic circuit
Decision taken during the 41st CTL meeting 2004 and modified at the 42nd CTL meeting 2005
Question: Some appliances have the following circuit
In Clause 19.11.2, it is stated that, if an electronic circuit operates to ensure compliance with
clause 19, the relevant tests of clause 19 should be repeated with a single fault simulated as
5 L# _! L4 V+ E+ l2 L! C) T4 Bin a) through f) of cl.19.11.2
8 R; B. q$ O6 W7 [0 CIn our opinion (VDE), an additional mechanical thermal cut-out is required.
  q. a- G' d$ m& m! J1 k# JConvenors note:
In clause 19.5, the electronic thermostat will operate to limit the temperature in one
/ d$ z  N( L  xconfiguration. The enquiry asks, if a single fault prevents the thermostat operation, is an
additional cut out required to comply with 19.5
Decision:
; l! W2 y0 `: _0 ]: JAn additional thermal cut-out is required
; r0 y- n) |) ^Note: This is only applicable to the above mentioned standards and is not applicable to
& @; a$ D; i- v/ y. YIEC60335-1(4th Ed. with Amendment 1).
) n6 u, v" B; B7 _8 j
6 U" f. R6 N8 L  X
' j+ G; V! u, S4 e6 l8 C* w: K1 v. Y