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glow-wire test 的总定义:# r. ~0 O. S D* w
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Parts of non-metallic material shall be resistant to ignition and spread of fire. I3 o( L5 h' F' n2 i9 \
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)# L+ ?% O" U" y0 j8 H3 g
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) u2 E% Q% k1 | f4 r30.2.2 For appliances that are operated while attended, parts of non-metallic material supporting current-carrying connections, and parts of non-metallic material within a distance6 v" i- X5 c" @7 k, ~( R7 N( |. P
of 3 mm of such connections, are subjected to the glow-wire test of IEC 60695-2-11.
$ @1 Z" W* I! m; CHowever, the glow-wire test is not carried out on parts of material classified as having a glowwire- Q+ s ^7 c# {1 c. M6 l: J+ c
flammability index according to IEC 60695-2-12 of at least
W: H( Y; V9 L2 i1 s– 750 °C, for connections which carry a current exceeding 0,5 A during normal operation,8 g7 f" Z+ z% s6 ]9 R" w' v
– 650 °C, for other connections.& e6 A0 G1 U2 w) p! y
If the glow-wire flammability index is not available for a sample with a thickness within
' `: d! w$ y9 l0 f# v$ Y9 I2 {: g/ e9 ?8 M± 0,1 mm of the relevant part, then the test sample shall have a thickness equal to the nearest. n. ~4 W# ]( {: @ {( }( Y
preferred value specified in IEC 60695-2-12 that is no thicker than the relevant part.
) y) y% y, a( F$ M- ~/ xNOTE 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.
3 G9 c( V+ T. ^3 e7 k6 O' nWhere a non-metallic material is within 3 mm of a current carrying connection, but is shielded
. C( m7 ^5 O2 R# ufrom the connection by a different material, the glow-wire test of IEC 60695-2-11 is carried out& U, v( V# i! }: G! O( a; S! d
at the relevant temperature with the tip of the glow-wire applied to the interposed shielding
3 V* p* a7 e( E$ s2 d5 a3 B! h6 xmaterial with the shielded material in place and not directly to the shielded material.
( G; u+ @( S4 g7 G! x ^! ^When the glow-wire test of IEC 60695-2-11 is carried out, the temperatures are
! u' }( P3 [( m, p# A" c– 750 °C, for connections that carry a current exceeding 0,5 A during normal operation,
6 Z" n3 ~! I y+ a2 \. T– 650 °C, for other connections.
! N, L" ~9 c; xNOTE 2 Contacts in components such as switch contacts are considered to be connections.& F3 S. _+ x$ s, C* `; v
NOTE 3 The tip of the glow-wire should be applied to the part in the vicinity of the connection.! I% `1 b& g7 M9 J" E+ i6 }
This test is not applicable to:
q/ _: V) ^, V* r# h; [) ]– parts supporting welded connections;& b# O9 |+ S/ B
– parts supporting connections in low-power circuits described in 19.11.1;
+ V* N1 Z7 F" o+ }– soldered connections on printed circuit boards;) {' j8 n3 Q6 M- T( i
– connections on small components on printed circuit boards;
P7 [# b, L, X% H$ F$ C9 wand parts within 3 mm of any of these connections.
2 K6 L" ~; z& {NOTE 4 Examples of small components are diodes, transistors, resistors, inductors, integrated circuits and capacitors not directly connected to the supply mains.$ ?: N" p( ?) f9 d& |$ X
It is also not applicable to:* h) E- `6 O: `8 t
– hand-held appliances;* I3 M5 g$ O6 o- t
– appliances that have to be kept switched on by hand or foot;- d2 Q r) Z% u0 Y* }
– appliances that are continuously loaded by hand. 8 P, ?! o; o8 s/ j1 y
(IEC 60335-1-2006 Clause 30.2.2) |
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