# I' c% d2 C; ^7 N& }/ J这个产品看起来是一个锅类器具，估计具体应该参考UL1083。 6 v* h; Z+ Z$ q, v
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： - n3 ^3 E) A; ]' E4 {% d) ?# W" `
7.4 Among the factors that shall be taken into consideration when an enclosure is being judged for acceptability are its: 6 }. x" _* p- q( o
a) Physical strength; 1 ^$ S9 T0 F+ ?
b) Resistance to impact; ! P1 O+ S" X% yc) Moisture-absorptive properties; 3 O6 A# q# U Z0 T7 s8 }( b( i: Ad) Combustibility; # I6 Q8 x$ e* P. Y+ `
e) Resistance to corrosion; and & H& C7 T- H" Zf) Resistance to distortion at temperatures to which the enclosure may be subjected under conditions of normal or abnormal use. + x" u$ i. }7 L, I/ lFor 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. , c: Z1 F% P/ h5 R) v
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. ; {8 G) Q. G& ?
Exception 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. " p5 ~8 u) ]1 k4 }; y
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. " D/ ^1 Y% J) s g" @. j: A- Z3 X0 J& p$ Q' V+ O
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作者: tianchi0305 时间: 2011-1-29 07:31
也要看具体的吧作者: 一地落叶 时间: 2011-1-29 08:12
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黄卡的作者: gaoyimin123 时间: 2011-1-29 08:38
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.作者: gaoyimin123 时间: 2011-1-29 08:41
Suitability for thermoplastic materials to be in direct support of live parts, below are the suitable properties for each flammability, Per UL 746C, Table 8.16 ?/ c$ j8 R$ d, f, ?
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。; C! a6 a2 U8 Z' B+ c2 J6 m4 z
V-0 V-1 V-2 HB 2 ~' @& `0 O; E/ B3 xHAI 3 2 2 1 # M% m, b9 ~ a& BHWI 4 3 2 20 g! s6 g$ Y( E0 j
CTI 4 4 4 4 . o/ Y" Y: c6 _' V( L! C1 c7 Z3 T
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, v' r. j h5 |: \4 ^
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。 , L; m1 U* G/ a* q) K" Q! d0 C( s: s
V-0 V-1 V-2 HB 0 V0 n2 C6 i1 u4 B8 c% mHAI 3 2 2 1$ q6 v7 ~' T5 R/ z5 G+ m
HWI 4 3 2 2 - ~' q- E# V, U! k5 c3 B4 G" `CTI 4 4 4 4 0 X3 [$ P3 {( ^- V! P( m% c数字越小，代表HAI/HWI/CTI的性质越好。4 l+ r5 I- T/ f! E X* o6 F' t
例如：奇美PA-766 UL黄卡摘录( U" T1 B) C: q6 D2 @! J
H D , n/ _3 A% H8 u6 a8 [ N Min. H H R T I V 4 C ! e& b' w6 J( f6 j: u; L7 B. a Thk Flame W A Elec Mech T 9 T; y- d+ J6 {% e8 D2 B5 z) O7 n. P
Material Dsg Color mm Class I I Imp Str R 5 I2 w4 `% q! U" `& P: I5 `+ x
PA-766 ALL 1.5 V-0 1 0 60 60 60 0 7 2 : F1 U8 w$ o" U0 f& b 2.5 5VA - - 60 60 60 ) K- f" K7 y" M' O# |2 G 3.0 5VA 0 0 60 60 60 ; {$ |* ~2 P) q$ I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。 . r- K! V4 Y* x) {2 m. E. L' h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。 ) L0 R+ ?2 Z# Z/ o6 K, e1 j8 S3 G: D! ]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. ! z: h. u0 Q. @! {% \$ W9 e8 I% c
HWI Range 8 `4 A1 }6 | [; }+ BMean Ignition Time (in sec) Assigned 6 _' G7 p* p( L% e3 ]8 ZPLC; b, u) N; f& m$ Q, z* T7 J
120 and longer 0 6 d6 t; q3 K7 q; J2 B0 ]8 R, n60 through 119 1( Z s9 H. a1 N: j9 y3 |7 B
30 through 59 2( h& N( ~- v/ M9 F7 F. c% k4 P% F& z" z
15 through 29 3 ) {6 J/ _4 ]" ?: s6 s7 through 14 4 * n4 {) A4 r6 WLess than 7 50 g# l8 j+ l0 V* d
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.1 R+ S' G- a; F
HAI Range 1 T2 [: l: b1 V9 G
Mean Number of Arcs 9 O3 B9 u2 L+ |to Cause Ignition Assigned " C/ W0 {& G1 d
PLC 1 F* C8 b! I. ~* d3 m- ^120 and greater 0 J7 W$ G: z3 u7 p( ?3 d60 through 119 1 ! ]' I- c8 S1 \. U6 `30 through 59 2 ) T: K( e3 f# j% _) ]- S9 \3 G15 through 29 3 7 H$ v% ?) a# W3 r# nLess than 15 4. K$ m; ~1 G$ L
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. ; r Q j4 u, Q' m' lCTI Range & S# k. d- q, T m3 ITracking Index; W L0 C3 \" G) }; _
(in volts) 3 l+ @ y9 [$ O$ D
Assigned # `; f; d4 p U4 z5 kPLC( ]/ n4 B2 j y
600 and greater 0 % Q7 S- c& w! m0 @ F400 through 599 1, }7 v7 }$ |6 z; A
250 through 399 2 9 Q7 i, [) x, I1 r+ Z175 through 249 3+ @4 `1 O" k, [0 o d
100 through 174 4 % A' @3 |# g; T3 O& v3 B; }+ ~Less than 100 5! O s: N* A, y2 ~- P) @2 i
& M; v6 n% b' y7 k8 K0 h
黄卡的说明COLUMN HEADING ABBREVIATIONS 7 A% u, [) Y f) j2 W I1 UThe following abbreviations may be used in the column headings in the individual Recognitions:2 B4 T4 J7 g( J2 I
Abbreviation Term& H* o0 l I) W9 X9 V
Flame Class ANSI/UL 94 Flammability Classification ( ^2 ~" _8 V0 g) HMaterial Dsg Material Designation 6 k: s- C! O; H* z: LCol Color0 `# ]* |1 U: O( p6 Z1 {! }+ X
Min Thk Minimum Thickness - R, S/ J, F3 D/ x2 d) e! mThk Rg Thickness Range. a6 M8 ~* s% g
Den Range g/cc Density Range, g/cc % p7 d7 ]& L0 H: Z% T2 cElec Electrical9 l+ X |- D2 ?6 }6 c+ U
RP Radiant Panel . r& s Z, q1 f1 H8 b6 |; DRTI Relative Temperature Index0 X1 b6 a" [" \8 n0 b) _8 g. n
HWI Hot-Wire Ignition ) l3 y" N# H& e6 w* J9 B7 x) DHAI High Current Arc Ignition1 S8 j, }& k0 M/ _2 s8 F$ p
HVTR High Voltage Arc Tracking Rate: A. L" Y+ G" N L, ^
D495 Arc Resistance, j/ ^) v- ^$ H5 P8 K9 E7 R
CTI Comparative Tracking Index4 d. i9 Z+ {% f/ z2 k7 O" L l
Mech Mechanical1 ~/ `# L; k) O% J; f6 G
Tnsl Tensile1 v: i# F3 h; X' E, e4 f
Elong Elongation2 h# Q( y1 s. S
Str Strength , g3 ~4 p# U: c& F1 G5 u/ YImp Impact作者: adazhu 时间: 2011-1-29 11:55
该产品，不是煮蛋器就是温奶器，使用标准为UL1026.+ a- I# D: Z% X6 H' I! p1 P
; K7 C) Z/ D: E1 d# n1. 该产品塑料外壳材料的最低燃烧等级为V-2( H0 \2 N' b. f: f% r
