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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。

3 ^5 d& u; R8 D: U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：
6 ]0 {8 ]- z( o3 I" h* H7.4 Among the factors that shall be taken into consideration when an enclosure is being judged for acceptability are its:
a) Physical strength;
b) Resistance to impact;
- M9 j5 J$ P! M- a9 Oc) Moisture-absorptive properties;
d) Combustibility;
3 b, B) x1 P7 @1 N  je) Resistance to corrosion; and
' T% J* p3 b3 f# g/ W2 C9 E! ~, Y  Lf) 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.
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.
( {6 u* ^- p( t6 o2 C  P" RException 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.

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
9 B' |  {8 ?4 y1 E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。
    V-0    V-1    V-2    HB
( M( E8 U  A2 ]1 zHAI    3    2    2    1
3 [3 S2 x2 t4 W) d$ R$ yHWI    4    3    2    2
CTI    4    4    4    4

: U# L8 T* |: o$ i8 n* y) {+ j: ySuitability 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
3 c2 a+ M) o/ u- X/ b9 N& r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。
7 [$ z- \6 [/ H' g
0 O6 r- ^) r; r3 l& ]    V-0    V-1    V-2    HB
HAI    3    2    2    1
HWI    4    3    2    2
8 X; h% K& V+ g# w5 ?: ~9 X- }' p0 iCTI    4    4    4    4
$ Z* M: V  {+ u% j数字越小，代表HAI/HWI/CTI的性质越好。
- q/ _; c' H9 j3 C" E例如：奇美PA-766 UL黄卡摘录
                                    H    D   
% B6 ~. d4 f) m& M$ |0 }0 L0 G3 k        Min.        H    H    R T I    V    4    C
) W& w. Y% s6 E& {/ c4 A' j        Thk    Flame    W    A    Elec    Mech    T    9    T
Material Dsg    Color    mm    Class    I    I        Imp    Str    R    5    I
& Y8 |  V% ?$ f7 y1 fPA-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            
2 Z' k9 w5 H% c; C; b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。
+ y: R2 |+ {7 V, d3 \# H5 _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。
% G, N6 R1 h$ h* d) s& {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.
% s7 l4 _$ ]. V5 k8 _/ h3 z; EHWI Range
Mean Ignition Time (in sec)    Assigned
PLC
" `* v9 V/ I$ k3 X8 ~, Q120 and longer    0
60 through 119    1
( m" ~  s1 w" c: Q0 `6 e" I& \- p; U- V30 through 59    2
: L8 J; n; g6 t1 x& a5 V15 through 29    3
& M9 O; w' l. Z; B1 T* T7 through 14    4
: V: }0 j5 {' o5 b1 pLess than 7    5
High 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
; V8 Z4 N* u* o. G) q5 }- GPLC
* h) Y" H' j% ?120 and greater    0
$ _% h9 X5 g- Q" b1 Z60 through 119    1
! G: |& H& O6 \# N) }4 E. ]30 through 59    2
15 through 29    3
Less than 15    4
% [0 U/ P/ r( Z8 n, F3 o' iComparative 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.
2 P$ a* I2 X' ?3 C3 vCTI Range
4 h, h) n* a% b, V& T+ n+ L2 rTracking Index
: k3 T* M3 p! c  s6 a( H2 @- S5 \(in volts)   
Assigned
- M/ h* d& i$ Z& G6 p" gPLC
600 and greater    0
8 N( e, P+ B0 |( ~4 `8 @! C400 through 599    1
% Y# f: }) J7 ^250 through 399    2
+ ]; K$ @# m7 b175 through 249    3
; C" w: |) e, Q' P5 c100 through 174    4
Less than 100    5
& ~8 m. g- ?" _+ R4 T5 h* k* U& `; o
2 X7 M( o; e8 O1 H黄卡的说明COLUMN HEADING ABBREVIATIONS
The following abbreviations may be used in the column headings in the individual Recognitions:
( D  h: e: u% p) r0 f+ pAbbreviation    Term
Flame Class    ANSI/UL 94 Flammability Classification
Material Dsg    Material Designation
  Q6 A! ?- g/ E) i, C$ uCol    Color
: m' [4 d1 Z( k# h( l  VMin Thk    Minimum Thickness
Thk Rg    Thickness Range
Den Range g/cc    Density Range, g/cc
Elec    Electrical
RP    Radiant Panel
8 x% b* g& ^5 r' BRTI    Relative Temperature Index
0 `4 }6 P* X5 G' W) k- `HWI    Hot-Wire Ignition
* U/ E4 n# g8 Q( A. KHAI    High Current Arc Ignition
HVTR    High Voltage Arc Tracking Rate
D495    Arc Resistance
# `  s8 V" ?% [3 a. FCTI    Comparative Tracking Index
Mech    Mechanical
Tnsl    Tensile
Elong    Elongation
  ^. \% s0 j- y, {0 D% I5 d  Y# u! `Str    Strength
! w- X. ]; k6 e. W9 [& gImp    Impact