PDSH 441A Sheathed heating elements

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IEC60335试验指甲

PDSH 441A + ?. y$ U' I5 k  A. f

Sheathed heating elements

19.11.2 + E7 P) Z/ d/ U; {8 L

60335-1(ed.3) & 60335-1(ed.4);am1;am2 & 60335-1(ed.5)

# K* [$ P& e) A  W  N$ |Standard(s):
IEC60335-1:1991, 3rd Ed.
IEC60335-1:2001, 4th Ed. + A1 and A2
! J; D% g9 U: l9 ]! p1 d* ~' C+ sIEC60335-1:2010, 5th Ed.
* O9 {$ ~# e$ ?( d4 M- zSub-clause(s): 19.11.2
3 w. G' C) a' V3 pNo. Year 2010
PDSH-441A
; [+ M6 h3 Z2 Z- sCategory: HOUS Developed by: ETF-1
Subject:
5 f* f- x' \' B$ V3 XSheathed heating elements
! l$ ?1 V6 A( WKey words:
- Abnormal, sheathed element
- Protective electronic circuit
  O* `0 k# W4 R/ m! i) XTo be approved at the 2011 CTL Plenary Meeting
/ v" f! @0 G/ l) `+ L- T/ wQuestion:
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
7 x, ]" A; b: ea single fault simulated as in a) through f) or g) of cl.19.11.2
6 e- W) N8 ^! u4 w# bIn our opinion, an additional mechanical thermal cut-out is required.
Convenor’s note:
In clause 19.5, the electronic thermostat will operate to limit the temperature in one
configuration. This enquiry is to seek confirmation whether an additional cut out is
+ r/ u- r- Z* C# _+ ]. H6 Prequired to comply with 19.5 if a single fault prevents the operation of the thermostat.
) z/ M  t! {3 `Decision:
An additional thermal cut-out is required or (for edition 4.1, 4.2 and edition 5) the
electronic thermostat is considered to be a PEC and has to be evaluated according to
the relevant tests.

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