PDSH 441A Sheathed heating elements

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广东安规检测
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小型摆管淋雨试验机

IPX5X6X7喷水试验机

1000L恒温恒湿箱

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各种灯头量规现货

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GB1002插头量规

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IEC61347/UL935镇流器热试验箱

灯具防风罩

IK冲击试验机

UL498插头插座量规

VDE0620插头插座量规

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家电温升测试角

针焰试验机现货

热电偶焊机现货

家电125mm试验指

E12灯头量规

无绳壶无绳电熨斗插拔寿命试验机

IEC60335试验指甲

PDSH 441A 2 n6 B, k4 t+ `- X6 G: U2 F0 K

Sheathed heating elements 9 {% C5 J" }5 W1 ^1 i2 f4 |# S+ \

19.11.2

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

Standard(s):
% O" u4 g0 q' R4 \$ }/ M  NIEC60335-1:1991, 3rd Ed.
IEC60335-1:2001, 4th Ed. + A1 and A2
) g; f1 C5 J8 w1 F; BIEC60335-1:2010, 5th Ed.
Sub-clause(s): 19.11.2
No. Year 2010
  [/ R* Z* ^- k+ L6 hPDSH-441A
3 R1 p' o8 \6 p: Z5 g) p$ \Category: HOUS Developed by: ETF-1
Subject:
Sheathed heating elements
Key words:
- Abnormal, sheathed element
- Protective electronic circuit
To be approved at the 2011 CTL Plenary Meeting
  D2 M- V# N$ X# R& OQuestion:
$ U) o: w5 C% T' ]6 H  WSome appliances have the following circuit:
1 t$ V5 n+ _8 VIn Clause 19.11.2, it is stated that, if an electronic circuit operates to ensure compliance
2 C, k; y2 q5 K2 _* s: i( wwith clause 19, the relevant tests of clause 19 should be repeated with
; c+ N- L8 l# na single fault simulated as in a) through f) or g) of cl.19.11.2
2 g/ Q- G; h8 ~7 MIn our opinion, an additional mechanical thermal cut-out is required.
Convenor’s note:
% c/ W6 |6 ]# mIn clause 19.5, the electronic thermostat will operate to limit the temperature in one
1 u/ u/ I5 m5 [' Z% a, e# J1 `; R9 @configuration. This enquiry is to seek confirmation whether an additional cut out is
, w/ n9 [) ^% P8 X0 `required to comply with 19.5 if a single fault prevents the operation of the thermostat.
, ~9 n1 T9 w% j2 Z* u, Y% ODecision:
6 w' Y7 o! @$ t6 q0 e* hAn additional thermal cut-out is required or (for edition 4.1, 4.2 and edition 5) the
9 o7 q) f& A! |0 {2 n7 zelectronic thermostat is considered to be a PEC and has to be evaluated according to
1 G  Y& ^0 a' ethe relevant tests.
  |5 Q4 B( v- K# a! ^3 `4 [
8 o' i9 \& V  F& p' o- T9 X