2 h6 J8 {# I E O& q这个产品看起来是一个锅类器具，估计具体应该参考UL1083。 9 B# ]: q5 Z; k4 n, B% J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： ; J& [: i6 E' Q* k7 O6 s7.4 Among the factors that shall be taken into consideration when an enclosure is being judged for acceptability are its: ; P6 H7 m9 s! X* X2 _5 X" \* _a) Physical strength; 1 Q C) y, C! c! E. a
b) Resistance to impact; " \ W" I# B4 H R* G
c) Moisture-absorptive properties; " y* I$ ]6 b$ R
d) Combustibility; u g+ J& Q# o/ k/ }e) Resistance to corrosion; and " ^$ x: g ^* N8 R' F" R" C
f) Resistance to distortion at temperatures to which the enclosure may be subjected under conditions of normal or abnormal use. 6 q( v* p% Z7 o# \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. 6 g0 [& {% M# U2 v0 U
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. % a6 K, z: B' g5 |* U" F/ 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. `0 \% s Z2 ?# `. T# ]
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. 2 v: ~9 r, U) K1 V
( \7 }. }, \% `6 T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 8.1 : |) I, I$ 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。& Y, A) @0 @1 e2 f/ W6 e
V-0 V-1 V-2 HB& r8 x) y5 E) R
HAI 3 2 2 1 - s& f7 k: Z' a/ i$ YHWI 4 3 2 2( K: n8 H; a; h6 W- R6 ~
CTI 4 4 4 4$ J( {0 I% |% y& A
0 D" {7 h( b7 Y5 t9 E1 w g
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. _# e( x" Q w# I% E" N: N; g
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 t$ C- R$ @" }! k* @) ^: }# c7 k2 B6 _
V-0 V-1 V-2 HB " {+ P" S( R% [9 I# y: x/ z5 THAI 3 2 2 1 ; w2 }1 A- x% U. R. \. j/ DHWI 4 3 2 2 ) S4 ?" Q+ J+ A4 p, e0 N9 lCTI 4 4 4 4. O0 x) u5 Q' |) b+ [. N! V1 c2 ]
数字越小，代表HAI/HWI/CTI的性质越好。 / O1 ?/ K D0 ?4 s6 D: u例如：奇美PA-766 UL黄卡摘录/ e7 ^& V$ `1 n( m
H D * X( f6 _) z# F/ e
Min. H H R T I V 4 C , K& e- b, D4 i& ^; v Thk Flame W A Elec Mech T 9 T , J( ?) o. K2 C8 ^+ X4 I& L& qMaterial Dsg Color mm Class I I Imp Str R 5 I% ]3 V' G; L1 z- c( }- V" M* J
PA-766 ALL 1.5 V-0 1 0 60 60 60 0 7 2 5 l g0 z) b& f- N0 Y; m4 t! X 2.5 5VA - - 60 60 60 1 x) v1 l# A5 A2 k( ] 3.0 5VA 0 0 60 60 60 9 Y1 R8 l9 o1 y9 j. _
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。 & @9 K# n+ b# j7 G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。7 a' X+ q1 b4 C% ^# _& G
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. 4 c5 X) T; v/ p, d8 ^/ g$ iHWI Range ) l7 Q, S" i8 w; Q% o& nMean Ignition Time (in sec) Assigned + C2 W) W" [2 \# o! qPLC 4 D; D; L. c; J2 J+ I4 ~. T120 and longer 0) J1 z3 S7 T [" h- w
60 through 119 1% Z* I8 l# a4 t
30 through 59 27 D7 s/ e/ U) y9 H: r6 [
15 through 29 3 4 s- H; \( B) f4 j# r. t4 s7 through 14 4 0 _% N! a' w3 J- T0 e. u; tLess than 7 5# e" m0 `% R, N
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.3 v! S& i* O' r
HAI Range ) {: X* a0 E# a, s F$ @) @2 m
Mean Number of Arcs " |- Z+ S" |( Y8 \4 ]6 ^- P/ dto Cause Ignition Assigned 4 a% s, o3 t( }
PLC1 ^: z! S7 _2 I8 b( t1 s0 f# X, S
120 and greater 0$ [1 m) Y3 V0 `0 N+ n) ?, ?5 {+ e
60 through 119 1 " s) p/ ~' U% O+ t0 g2 ~$ D X) X$ b30 through 59 2 - |# @) v! K% G/ o15 through 29 3& R# U: B, \! g/ U& ]. T' q
Less than 15 45 i7 t* I+ f/ Y. z0 a
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. " M; m2 J4 g4 j: R6 a' V: zCTI Range1 b0 q+ u" }5 _3 d
Tracking Index2 x/ X+ X" R/ m- E8 {; S
(in volts) 1 F1 Q6 {( b: u) q7 E& R
Assigned0 ^8 Y" I! W3 M, `
PLC" A5 i% K/ u7 E0 I P* Z
600 and greater 0 $ ]/ u1 V4 `5 U& d' W# ^0 q: S0 e( ^. t400 through 599 1" P. v3 F8 G& ]) j( w' v5 T( q3 d
250 through 399 2 ) V# Z9 j9 l( R% l& j; l: f175 through 249 3 N1 W5 b# c) P. S9 s100 through 174 43 g2 \4 ]. b, p8 L- z
Less than 100 5: A( m* X6 i$ G% |" P
/ w$ s2 y8 }8 p* C# o
黄卡的说明COLUMN HEADING ABBREVIATIONS/ E5 T7 L' Z; v0 i
The following abbreviations may be used in the column headings in the individual Recognitions:6 j7 }8 B5 j4 k$ |) n! U( J
Abbreviation Term/ t ~/ o; T5 K- A5 D
Flame Class ANSI/UL 94 Flammability Classification. B& R1 M. h' ?+ `" ?3 R9 R
Material Dsg Material Designation 9 i5 T3 K5 E$ ]Col Color# f" m# a- T( p4 q( F& u7 H: S1 \
Min Thk Minimum Thickness J/ U" @% a4 \, C1 g8 W. k7 ~0 nThk Rg Thickness Range# n; i) S E, C- `, g7 N. c* |
Den Range g/cc Density Range, g/cc2 n) o: c" _! j
Elec Electrical ( E0 X$ T | D+ SRP Radiant Panel$ J" b6 Z3 c e- h; Q
RTI Relative Temperature Index7 ^0 V& w0 i4 J6 p) p3 T( s8 o0 }1 W
HWI Hot-Wire Ignition 3 D4 C' v/ Q# w) {HAI High Current Arc Ignition K1 E9 _3 w7 \6 UHVTR High Voltage Arc Tracking Rate 2 e' z6 D- w4 m4 z5 ED495 Arc Resistance j6 l# t0 N* V) ?0 z1 j
CTI Comparative Tracking Index 4 z; t7 _6 |2 B0 J# n. a8 BMech Mechanical : T6 J$ F8 x8 X7 L2 b% eTnsl Tensile' J! O2 s3 k A
Elong Elongation4 t8 h" d( G; ]: J- x
Str Strength& m5 G* t* H) T0 j7 \2 ]
Imp 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. / N6 Q' I b2 ^0 g* L2 J / j, d# a0 ^! \1. 该产品塑料外壳材料的最低燃烧等级为V-2 : v* H) k+ ], d- b; g+ F) V' J/ ` n4 @
2. 根据UL1026 7.6节该产品塑料外壳材料可以选择燃烧等级为HB的塑料材料，但是必须要满足以下两种条件中的一个：# S2 _ m" j; P( `" h2 h& V& T
（1） 产品中有过热保护，HAI小于或等于1， HWI小于或等于4，带电部件到塑料外壳（包括外壳内的加强筋或其它部分）至少有12.7mm的距离。或) W# i g+ o! J5 Z
（2） 该材料符合UL746C中19mm的燃烧测试（3/4 inch Flame Test）
