PDSH 441A Sheathed heating elements

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IEC60335试验指甲

PDSH 441A

Sheathed heating elements

19.11.2 $ g! w+ T' L: ^

60335-1(ed.3) & 60335-1(ed.4);am1;am2 & 60335-1(ed.5) 3 u. ?; C+ m/ @5 f! D  \7 W: u

, {, l4 Y4 w' l# }7 oStandard(s):
! ?8 R6 n2 m+ n$ x4 c7 e& _6 H: Y( mIEC60335-1:1991, 3rd Ed.
IEC60335-1:2001, 4th Ed. + A1 and A2
8 q, N4 G& O$ _IEC60335-1:2010, 5th Ed.
Sub-clause(s): 19.11.2
. x4 U4 ~, z$ F5 HNo. Year 2010
( s1 v4 g9 n+ e: }/ R* h* I; uPDSH-441A
Category: HOUS Developed by: ETF-1
Subject:
  e6 l/ ?; s! _, p: l3 uSheathed heating elements
Key words:
- Abnormal, sheathed element
; g9 d' B: s" l- Protective electronic circuit
: {4 h7 K# C" e2 x5 Y$ p8 ZTo be approved at the 2011 CTL Plenary Meeting
2 P1 c. b" x1 vQuestion:
, k0 [5 r0 c8 I0 {0 R& y6 H0 R% t+ Z- ySome 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
; {2 |7 w* v) g+ A/ xa single fault simulated as in a) through f) or g) of cl.19.11.2
In our opinion, an additional mechanical thermal cut-out is required.
& z. O* V2 Q; }Convenor’s note:
In clause 19.5, the electronic thermostat will operate to limit the temperature in one
! s$ X( c. V% W3 @  l3 j' jconfiguration. This enquiry is to seek confirmation whether an additional cut out is
required to comply with 19.5 if a single fault prevents the operation of the thermostat.
, N2 n% i2 b; }! Q% H/ nDecision:
9 e  r% T6 z$ n  W- Y, c' QAn additional thermal cut-out is required or (for edition 4.1, 4.2 and edition 5) the
' M: \6 ~% F  |  t& B% ^  Eelectronic thermostat is considered to be a PEC and has to be evaluated according to
! u0 p0 _/ e+ P$ |& V! `the relevant tests.

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