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广东安规检测
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IEC60335试验指甲

   各位大侠，请指教。如附件图片所示的结构，其是否被视为发热件外壳。如被视为发热件外壳，其防火等级要求如何，在不更改现有塑胶件的情况下，有何改进措施？该产品欲做UL认证。

394846972

外壳等级为V-1以上

aiduoxi

LZ的图片看起来盖顶有层铜铂，这样的话燃烧应该是V-0级的

山炮

温控和热保护应分开放在不同极上，UL不用接地的吗？内部布线也没有适当的固定，还真的担心故障试验时漏水。（不太懂UL，随便说说）

apple2010

做ＵＬ如果是不熟悉标准的，会做得比较痛苦，若订单很赶建议好好想一想要怎样做

Liu

UL标准的塑胶外壳防火等级不能简单地去说用什么材料，电器产品的塑胶料往往都会参考到UL746C这个标准，希望大家能够去看，同时与产品标准是最息息相关的。

这个产品看起来是一个锅类器具，估计具体应该参考UL1083。
如果适用标准是UL1083，大家可以看看一下条款，估计看完后应该知道该怎样选择了：
7.4 Among the factors that shall be taken into consideration when an enclosure is being judged for acceptability are its:
a) Physical strength;
2 p0 O; p# b0 D- k- {# @9 v3 sb) Resistance to impact;
c) Moisture-absorptive properties;
d) Combustibility;
e) Resistance to corrosion; and
f) Resistance to distortion at temperatures to which the enclosure may be subjected under conditions of normal or abnormal use.
For a nonmetallic enclosure, see the enclosure requirements in the Standard for Polymeric Materials –Use in Electrical Equipment Evaluations, UL 746C. A metal enclosure or enclosure part shall be tested in accordance wiith the Metal Enclosure Impact Test, Section 36, for resistance to impact.
" ~1 n1 ~/ [. ]) `Exception No. 1: When considering the abnormal and severe conditions tests of UL 746C, the appliance enclosure is to be judged under the abnormal operations tests of Abnormal Operation Test, Section 46.
1 W7 {0 d3 u5 y2 P' KException No. 2: Thermoset materials need not be subjected to the relative thermal capability requirements of UL 746C. For a thermoset material operating at a temperature above its temperature rating, the 1000 hour aging test as specified in 43.1 shall be conducted.
7.5 A thermoplastic enclosure of an appliance provided with overheating protection (Overheating Protection, Section 22) need not comply with the flammability requirements of UL 746C if a material rated HB, and possessing 60 arcs minimum resistance to high current arc ignition, and 7 second minimum resistance to hot wire ignition is employed and all enclosure parts including ribs, grills, and the like are spaced a minimum 1/2 inch (12.7 mm) from uninsulated live parts.
& |# e* B+ `! `7 H8 L7 q* {
& \1 v2 Y8 V! s5 ?如果标准不是UL1083，那估计是UL1026，但是具体要求，其实也是一样的上面这段话。大家看到其实HB的料也可以使用，关键是后面带了个尾巴，这个尾巴很关键，留下话题，大家讨论尾巴，其实这个尾巴就是安规工程师是否真正入行的表现

tianchi0305

也要看具体的吧

一地落叶

建议买个电饭锅来参考一下，你那塑料件上面没有散热孔，我估计那样温升会很快，会导致通不过，还有塑料必须是VO级的了，虽然我没做过类似产品，但我们线盘，插座上面对这要求是非常严格的，UL认证产品的附材应该要有UL证书，我想那个塑料要有UL黄卡的

gaoyimin123

这是个什么产品?用UL什么标准?先提供支撑带电体的材料要求,外壳的要求是对应标准内有说明,挺多的外壳用HB也是可以的,但是要附加很多的测试,生产商为了省去测试,一般不用HB的材料.

gaoyimin123

Suitability for thermoplastic materials to be in direct support of live parts, below are the suitable properties for each flammability, Per UL 746C, Table 8.1
可以用来直接支撑带电体的塑料其HAI/HWI/CTI的指数需符合下表。
$ e. u3 e3 W. M3 j/ [( i    V-0    V-1    V-2    HB
* W6 G: M( T# {7 \# B  ^HAI    3    2    2    1
  Q+ h0 {! S$ O% r& Y) ^HWI    4    3    2    2
, ?5 l5 ?; w# f5 z' Z( ^CTI    4    4    4    4
8 t7 w0 }! v, F3 r) }
Suitability for thermoplastic materials to be in direct support of live parts, below are the suitable properties for each flammability, Per UL 746C, Table 8.1
可以用来直接支撑带电体的塑料料其HAI/HWI/CTI的指数需符合下表。

) l5 B; Y. R5 ?1 l- D( K7 j    V-0    V-1    V-2    HB
9 o3 ^# b1 z% [: D6 n5 G6 BHAI    3    2    2    1
HWI    4    3    2    2
" ]4 J3 @5 O& N2 qCTI    4    4    4    4
数字越小，代表HAI/HWI/CTI的性质越好。
; @3 a1 n) l9 A( I: H: L例如：奇美PA-766 UL黄卡摘录
                                    H    D   
        Min.        H    H    R T I    V    4    C
7 L/ z6 {7 B3 }+ e. J        Thk    Flame    W    A    Elec    Mech    T    9    T
Material Dsg    Color    mm    Class    I    I        Imp    Str    R    5    I
% i, U- k; B6 r- ^  p  U2 BPA-766    ALL    1.5    V-0    1    0    60    60    60    0    7    2
        2.5    5VA    -    -    60    60    60            
        3.0    5VA    0    0    60    60    60            
在最小厚度大于1.5mm时，其耐燃等级是UL 94V-0， HWI=1、HAI=0、CTI=2，因此看回上表HWI<4、HAI<3、CTI<4，符合上表，所以PA-766在最小厚度大于1.5mm时可以直接支撑带电体。
但若黄卡中HAI、HWI值为 “-“，则代表厂商申请此料时未做相关测试，所以是不能认可为可直接接触带电体的。
Hot-Wire Ignition (HWI; ASTM D3874, IEC 60695-2-20 ) — Performance is expressed as the mean number of seconds needed to either ignite standard specimens or to burn through the specimens without ignition.
/ C; i. m, L& B6 v7 N) ZHWI Range
Mean Ignition Time (in sec)    Assigned
PLC
4 p; Y% A1 m* y120 and longer    0
7 D8 Y/ f; @, Y* r7 _& h60 through 119    1
30 through 59    2
15 through 29    3
7 through 14    4
Less than 7    5
7 M& K1 Z9 @8 G# c+ JHigh Current Arc Ignition (HAI; ANSI/UL 746A ) — Performance is expressed as the number of arc rupture exposures (standardized as to electrode type and shape and electric circuit) that are necessary to ignite a material when they are applied at a standard rate on the surface of the material.
HAI Range
Mean Number of Arcs
to Cause Ignition    Assigned
PLC
' A6 E. A2 A. G) p- C, A120 and greater    0
7 E& i4 X) e: [60 through 119    1
( W" g& C- X4 ]7 b& ]( U: [5 Y30 through 59    2
15 through 29    3
1 h1 n, Q' e5 B5 d( \- m. k! XLess than 15    4
8 t4 Q3 u  }6 F; G/ ^Comparative Tracking Index (CTI; ASTM D3638 ) — Expressed as that voltage which causes tracking after 50 drops of 0.1 percent ammonium chloride solution have fallen on the material. The results of testing the nominal 3 mm thickness are considered representative of the material's performance in any thickness.
CTI Range
Tracking Index
8 h/ h7 {  S! R6 ]- U(in volts)   
Assigned
& y' _1 J, B8 U+ G. Y: ^) yPLC
, C* Y7 _; Q' p+ S; B7 W) r2 `600 and greater    0
/ z+ ?5 B9 a; c" u400 through 599    1
- K/ y2 L8 N; d" g8 h" V3 F250 through 399    2
175 through 249    3
100 through 174    4
! e$ V* `% z4 _  X9 b! lLess than 100    5
( ]. S2 Y2 }* w. j# `* W3 z/ R; x
黄卡的说明COLUMN HEADING ABBREVIATIONS
The following abbreviations may be used in the column headings in the individual Recognitions:
Abbreviation    Term
Flame Class    ANSI/UL 94 Flammability Classification
Material Dsg    Material Designation
Col    Color
Min Thk    Minimum Thickness
Thk Rg    Thickness Range
Den Range g/cc    Density Range, g/cc
Elec    Electrical
RP    Radiant Panel
% p5 s# d# ?' A4 k1 j2 |+ q/ nRTI    Relative Temperature Index
/ R; D+ d0 B: L+ |0 eHWI    Hot-Wire Ignition
1 i. E+ H, ]8 k! \HAI    High Current Arc Ignition
4 G/ n7 {& N0 ?. F; G# P; B% d$ YHVTR    High Voltage Arc Tracking Rate
6 g9 A8 u) o" }! ?D495    Arc Resistance
8 ]3 x4 B9 M0 e: t) s: HCTI    Comparative Tracking Index
Mech    Mechanical
8 N+ @& f2 k% t5 a) MTnsl    Tensile
Elong    Elongation
7 m( c# N) t1 p4 Y+ c  R( iStr    Strength
Imp    Impact