|
|
glow-wire test 的总定义：
' `3 t7 h Q; E! M Q! b: Y
4 a, f9 W: ]5 s8 t- }Parts of non-metallic material shall be resistant to ignition and spread of fire.
* A) g" p% e( R8 l' J) nThis requirement does not apply to decorative trims, knobs and other parts unlikely to be ignited or to propagate flames that originate inside the appliance. （IEC 60335-1-2006 Clause 30.2）
8 [( ~8 {, p5 i) Y8 v9 N
5 d4 k% @% @8 b0 z4 k5 g$ z1 U# J7 P" s9 j5 F3 O
再看：# Z3 K; ]2 ^" L5 j5 n1 e ^+ z; z
3 V/ I, W. r$ y
30.2.2 For appliances that are operated while attended, parts of non-metallic material supporting current-carrying connections, and parts of non-metallic material within a distance
& V2 }3 v$ N6 s8 A' P, X) M! f( bof 3 mm of such connections, are subjected to the glow-wire test of IEC 60695-2-11. 9 C4 S0 j3 e6 B1 f. D. V* j0 x4 T( D
However, the glow-wire test is not carried out on parts of material classified as having a glowwire
, U w a3 `7 `, G6 oflammability index according to IEC 60695-2-12 of at least! b) y- G- {0 X; v0 N0 x
– 750 °C, for connections which carry a current exceeding 0,5 A during normal operation,
8 r/ v: `6 n# Y8 ?" J– 650 °C, for other connections.# `0 a8 {1 A3 P% a$ B; E1 s& D
If the glow-wire flammability index is not available for a sample with a thickness within/ R$ V% v: N: \* R0 G- E! |- F
± 0,1 mm of the relevant part, then the test sample shall have a thickness equal to the nearest, Q% F) m. p- o8 \9 q+ @
preferred value specified in IEC 60695-2-12 that is no thicker than the relevant part.9 B2 B5 h+ K0 d" R: t
NOTE 1 The preferred values in IEC 60695-2-12 are 0,75 mm ± 0,1 mm, 1,5 mm ± 0,1 mm and 3,0 mm ± 0,2 mm.# O% i$ c6 u8 r* G! }
Where a non-metallic material is within 3 mm of a current carrying connection, but is shielded/ h0 P* a/ R4 m( m. v/ f+ t
from the connection by a different material, the glow-wire test of IEC 60695-2-11 is carried out; M: T( F! O Z& q; O0 M' }1 |
at the relevant temperature with the tip of the glow-wire applied to the interposed shielding
" d! q; D4 M) a0 }material with the shielded material in place and not directly to the shielded material.
8 j2 Z. w$ x1 |$ `9 S5 ^When the glow-wire test of IEC 60695-2-11 is carried out, the temperatures are
, h6 d) ^5 u/ W3 U$ ?' ^– 750 °C, for connections that carry a current exceeding 0,5 A during normal operation,$ N9 p1 q; X m6 k6 B- A8 S
– 650 °C, for other connections.
! ?' U% r; R" Q9 f0 a( Q. lNOTE 2 Contacts in components such as switch contacts are considered to be connections.2 R/ ~! L- {. u) E5 h' @
NOTE 3 The tip of the glow-wire should be applied to the part in the vicinity of the connection.
* q) R. D+ K' M7 f8 YThis test is not applicable to:/ r) H# _# e l% c; b
– parts supporting welded connections;0 L9 Z D3 v; B
– parts supporting connections in low-power circuits described in 19.11.1;" A+ w6 }3 A. h5 B
– soldered connections on printed circuit boards;
/ s5 Y0 h( |1 d2 J– connections on small components on printed circuit boards;
: J+ m2 w& D* ^; w0 t! C R1 Band parts within 3 mm of any of these connections.* W& d; |+ d- X/ P- \( O! f; J
NOTE 4 Examples of small components are diodes, transistors, resistors, inductors, integrated circuits and capacitors not directly connected to the supply mains.
$ J1 i* c( ?9 ~5 o' d. G G0 xIt is also not applicable to:
! Q' h- Z! E) s– hand-held appliances;
& H# i; H& }% ^4 P7 B– appliances that have to be kept switched on by hand or foot;- k$ I* @) M, Q8 m* b. J# S7 b
– appliances that are continuously loaded by hand.
/ f% ^! `8 s- w/ o（IEC 60335-1-2006 Clause 30.2.2） |
|
/2 
|关于安规|小黑屋|安规QQ群|Archiver|手机版|安规网
( 粤ICP13023453-10 ) 
窥视卡
雷达卡
发表于 2007-6-1 21:07
提升卡
置顶卡
沉默卡
喧嚣卡
变色卡
抢沙发
千斤顶
显身卡
楼主