|
glow-wire test 的总定义:
* o% c7 K" o, c7 V+ D
9 l. r( K! i6 J5 W( l6 vParts of non-metallic material shall be resistant to ignition and spread of fire./ K+ T! T x* t! o$ i$ q
This 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)% G. ~: x0 h- w$ h/ S& z) e
. x- h% s8 X' W+ ` f+ J
# `6 l# N, z) \0 f( L9 Y8 [; B7 `再看:$ i8 s# c& q" p* U% k! ~. w5 y
! o' J' H. j" l2 f: N v
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
3 @5 _" j0 a3 X; ^: h; q4 @of 3 mm of such connections, are subjected to the glow-wire test of IEC 60695-2-11. # \6 K/ H6 @: a& v7 }4 P' Y
However, the glow-wire test is not carried out on parts of material classified as having a glowwire
9 H+ Q) V# Y# L; W8 @flammability index according to IEC 60695-2-12 of at least
T$ W. @- ?# {" E }– 750 °C, for connections which carry a current exceeding 0,5 A during normal operation,
- N( _, I) a6 | m8 S6 E$ h5 \– 650 °C, for other connections.
3 x0 y0 B ?- M RIf the glow-wire flammability index is not available for a sample with a thickness within# ~% g: Z. y& W+ i
± 0,1 mm of the relevant part, then the test sample shall have a thickness equal to the nearest
+ `- @$ j d3 d) J5 y3 `preferred value specified in IEC 60695-2-12 that is no thicker than the relevant part./ P7 U9 p+ R5 ~
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.1 J# c% u7 f% L) k0 s, g
Where a non-metallic material is within 3 mm of a current carrying connection, but is shielded8 u; i. ?' d2 Z
from the connection by a different material, the glow-wire test of IEC 60695-2-11 is carried out: [. W% _7 ?$ x; b' ]( k
at the relevant temperature with the tip of the glow-wire applied to the interposed shielding3 {" {& k& }0 P+ P+ X9 K6 j
material with the shielded material in place and not directly to the shielded material. N% a) P- H$ t- _ c x
When the glow-wire test of IEC 60695-2-11 is carried out, the temperatures are5 O; w! R: k: r2 W+ A
– 750 °C, for connections that carry a current exceeding 0,5 A during normal operation,3 H7 |% P' E) M5 p6 x+ V4 {
– 650 °C, for other connections.. s* T4 w0 z, t g+ s
NOTE 2 Contacts in components such as switch contacts are considered to be connections." Q- m |% V& k5 e9 C
NOTE 3 The tip of the glow-wire should be applied to the part in the vicinity of the connection.
# a+ \ |0 C: G4 Q4 }% hThis test is not applicable to:) A0 Q v6 b# i5 u( |: z! C
– parts supporting welded connections;# _+ }8 v6 w/ [5 A" s* j3 \3 z
– parts supporting connections in low-power circuits described in 19.11.1;
& e% ?' m8 k& E ?, k7 l– soldered connections on printed circuit boards;
, t5 _+ B1 R) M+ u1 Y* J– connections on small components on printed circuit boards;
* ~6 m& n) }( O/ Qand parts within 3 mm of any of these connections.
( g+ Z5 p; D9 N, i @4 W- W% eNOTE 4 Examples of small components are diodes, transistors, resistors, inductors, integrated circuits and capacitors not directly connected to the supply mains.$ g2 a2 }* F' @# T3 ~
It is also not applicable to:
" Q2 z6 m( l- B9 I– hand-held appliances;, L# N5 j: Q' V a
– appliances that have to be kept switched on by hand or foot;8 l2 S" f5 Z4 A
– appliances that are continuously loaded by hand. * }5 g& ^# `6 O6 `# @3 G, a* u
(IEC 60335-1-2006 Clause 30.2.2) |
|