DSH 441A Sheathed Heating Elements

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DSH 441A ! s, t/ s8 w! `6 b- i

Sheathed Heating Elements   n4 r+ t4 R. p+ f' p) i  L. `& o+ Q4 \

19.11.2

60335-1(ed.3)

/ e8 k  Q. `1 aStandard: IEC60335-1:1991, 3rd Ed.
Sub clause: 19.11.2
+ T8 c; q. S- R; K0 NSheet n°: DSH-441A
; e$ ?- ?; z" z' i  `7 kSubject: Sheathed Heating Elements
Key words: - Abnormal, sheathed element   - Protective electronic circuit
; L5 e3 P. K$ ^7 B! l& N' t: ]Decision taken during the 41st CTL meeting 2004 and modified at the 42nd CTL meeting 2005
Question: Some appliances have the following circuit
9 ~2 i+ V1 i, ]8 w" uIn 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
in a) through f) of cl.19.11.2
% }# u; I. h, @% uIn our opinion (VDE), an additional mechanical thermal cut-out is required.
: t" l/ L* R, f! v" _Convenors note:
In clause 19.5, the electronic thermostat will operate to limit the temperature in one
configuration. The enquiry asks, if a single fault prevents the thermostat operation, is an
0 x8 o! w9 d+ I& k3 M7 dadditional cut out required to comply with 19.5
Decision:
An additional thermal cut-out is required
Note: This is only applicable to the above mentioned standards and is not applicable to
2 r3 Y6 P/ W7 l0 }IEC60335-1(4th Ed. with Amendment 1).
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