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glow-wire test 的总定义:
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Parts of non-metallic material shall be resistant to ignition and spread of fire.5 u) W' k' c) C3 q1 e( 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)" I" g/ y G( v F: R2 T0 e% ~! g
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再看:
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4 ?+ ]0 q$ b+ c6 F, ?& O, j30.2.2 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
. u5 c% o! _4 Z& W' {0 ^% sof 3 mm of such connections, are subjected to the glow-wire test of IEC 60695-2-11.
$ G. K: S1 O% v+ o' ~/ W9 FHowever, the glow-wire test is not carried out on parts of material classified as having a glowwire
# q- w/ h; y; @flammability index according to IEC 60695-2-12 of at least
# x Q' [! |) Q! p2 n4 i; h* k– 750 °C, for connections which carry a current exceeding 0,5 A during normal operation,: m% _ Y u* r: j0 P* Z N
– 650 °C, for other connections.
) s: p1 B4 J5 m$ _% L8 D$ MIf the glow-wire flammability index is not available for a sample with a thickness within: T# k% c7 f# L: y$ V
± 0,1 mm of the relevant part, then the test sample shall have a thickness equal to the nearest, ]3 t8 U9 E$ @$ U! [5 L5 m
preferred value specified in IEC 60695-2-12 that is no thicker than the relevant part.+ v4 S2 ~7 T" s3 E
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.
. Q1 B6 E5 G" [+ F- I: p& |& ~* X; j5 hWhere a non-metallic material is within 3 mm of a current carrying connection, but is shielded8 X: w4 o) }0 h9 Y. o2 D
from the connection by a different material, the glow-wire test of IEC 60695-2-11 is carried out) L; r$ E1 ^, C9 j# L
at the relevant temperature with the tip of the glow-wire applied to the interposed shielding3 r/ K- Q4 z# B& Y. x) z) g
material with the shielded material in place and not directly to the shielded material.
) R2 _+ q: q; ~) E7 T* TWhen the glow-wire test of IEC 60695-2-11 is carried out, the temperatures are
]* C+ A4 q$ d% Q C; R– 750 °C, for connections that carry a current exceeding 0,5 A during normal operation,% D. U1 o ]3 ?
– 650 °C, for other connections.
$ N4 r3 o6 a# x/ m& G6 Y% uNOTE 2 Contacts in components such as switch contacts are considered to be connections.
8 ?/ k+ e! V/ j7 WNOTE 3 The tip of the glow-wire should be applied to the part in the vicinity of the connection. B# E* b6 F. l% J5 c- Y3 {
This test is not applicable to:
! _8 j6 I; g( P0 g– parts supporting welded connections;0 {0 a, i5 B: h& r( B$ I
– parts supporting connections in low-power circuits described in 19.11.1;
6 O7 T! K8 f3 G. |) j( U1 ~– soldered connections on printed circuit boards;0 D6 _5 a0 Q, l1 ^& n2 E" Y$ d
– connections on small components on printed circuit boards;- Q6 C- j$ H9 Q3 R* D6 j$ C! S' `8 C
and parts within 3 mm of any of these connections." J4 v u# |" R8 k. s8 g
NOTE 4 Examples of small components are diodes, transistors, resistors, inductors, integrated circuits and capacitors not directly connected to the supply mains.% G, v% Y' b R0 i( k2 d
It is also not applicable to:9 g8 I2 r: `) R. t! G4 H. K9 f3 p
– hand-held appliances;
2 F% S. s9 z( O+ ]" a– appliances that have to be kept switched on by hand or foot;
2 a7 ~& I4 ^+ P. W% }/ u$ d5 G– appliances that are continuously loaded by hand.
) E7 n- `- m) a$ K(IEC 60335-1-2006 Clause 30.2.2) |
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