PDSH 441A Sheathed heating elements

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IEC60335试验指甲

PDSH 441A : p- Y5 G7 X, O5 k" `2 G9 x9 r

Sheathed heating elements

19.11.2

60335-1(ed.3) & 60335-1(ed.4);am1;am2 & 60335-1(ed.5) 8 ]) {$ B$ u8 e( w

6 g* m0 p+ u2 {- {) YStandard(s):
IEC60335-1:1991, 3rd Ed.
IEC60335-1:2001, 4th Ed. + A1 and A2
3 |/ U. N# w# F1 pIEC60335-1:2010, 5th Ed.
Sub-clause(s): 19.11.2
; A* ^3 J: K5 `9 {2 }No. Year 2010
6 M9 n$ K: H. o& H8 {3 ZPDSH-441A
Category: HOUS Developed by: ETF-1
Subject:
  m9 q5 `  r/ [7 K1 qSheathed heating elements
- k* d0 A3 a* q& Z+ vKey words:
- Abnormal, sheathed element
% ~% {; P4 h3 u; ?- Protective electronic circuit
To be approved at the 2011 CTL Plenary Meeting
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 in a) through f) or g) of cl.19.11.2
) A* `3 u' G0 C( k* ]8 bIn our opinion, an additional mechanical thermal cut-out is required.
Convenor’s note:
' A( w# |+ L2 B. l9 p7 y% Y; i" xIn clause 19.5, the electronic thermostat will operate to limit the temperature in one
2 v# I2 \% i* `% N. ?configuration. This enquiry is to seek confirmation whether an additional cut out is
* |. O& X: F6 I6 z0 i0 Qrequired to comply with 19.5 if a single fault prevents the operation of the thermostat.
Decision:
; S0 i* K. E. z9 ^An additional thermal cut-out is required or (for edition 4.1, 4.2 and edition 5) the
- P: A- g) m8 F3 U' ]/ uelectronic thermostat is considered to be a PEC and has to be evaluated according to
8 E1 n! h. p3 U3 d6 hthe relevant tests.



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