DSH 441A Sheathed Heating Elements

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DSH 441A + d* h5 L" u; J0 T6 c " q& B" q  }5 g" Q

Sheathed Heating Elements

19.11.2 * e3 a: a+ j$ C3 ?' T

60335-1(ed.3)

Standard: IEC60335-1:1991, 3rd Ed.
! W( g: g* \9 k7 |: FSub clause: 19.11.2
* x* ^! F- m: U& ]( d! Z6 rSheet n°: DSH-441A
Subject: Sheathed Heating Elements
Key words: - Abnormal, sheathed element   - Protective electronic circuit
) N' ^3 b7 u# g7 g( [8 vDecision 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
) _; h# o) L0 E& N6 nclause 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
In our opinion (VDE), an additional mechanical thermal cut-out is required.
Convenors note:
In clause 19.5, the electronic thermostat will operate to limit the temperature in one
2 c4 F: J% B2 Q3 ^, s  p$ z% Cconfiguration. The enquiry asks, if a single fault prevents the thermostat operation, is an
additional cut out required to comply with 19.5
3 @/ n( u, r5 dDecision:
An additional thermal cut-out is required
Note: This is only applicable to the above mentioned standards and is not applicable to
' u! j/ l8 A/ B6 p. B& AIEC60335-1(4th Ed. with Amendment 1).

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