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glow-wire test 的总定义：% Q, D! p$ I4 E! ^8 a
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Parts of non-metallic material shall be resistant to ignition and spread of fire.( X& C2 E) I" j" d! y; K
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） e. w3 K- N; C* a- I' z6 L
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再看：
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! V; ]! X- M7 m0 g" a30.2.2 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
- X7 \: @/ y7 o7 s' @: vof 3 mm of such connections, are subjected to the glow-wire test of IEC 60695-2-11.
0 B8 q- }$ i9 V5 U% ]7 L$ \5 ]However, the glow-wire test is not carried out on parts of material classified as having a glowwire4 W5 t' Q% Z5 s& i) M
flammability index according to IEC 60695-2-12 of at least
/ _+ B/ l* \( j3 I7 i/ {– 750 °C, for connections which carry a current exceeding 0,5 A during normal operation,
" g/ p x: _6 p– 650 °C, for other connections.& M+ M. Y4 K& ?) H4 s
If the glow-wire flammability index is not available for a sample with a thickness within4 N! ? D$ z/ s' M
± 0,1 mm of the relevant part, then the test sample shall have a thickness equal to the nearest) S3 W- D. h, u
preferred value specified in IEC 60695-2-12 that is no thicker than the relevant part.) T+ @8 }' D3 v7 |) y+ V8 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.3 F6 }1 }3 p9 r* d3 Q5 F
Where a non-metallic material is within 3 mm of a current carrying connection, but is shielded0 x8 ^9 `# y- X6 b: H
from the connection by a different material, the glow-wire test of IEC 60695-2-11 is carried out
- E, w7 T4 x' m( u+ Eat the relevant temperature with the tip of the glow-wire applied to the interposed shielding% f* d$ p5 p4 L9 b* G
material with the shielded material in place and not directly to the shielded material.
6 U' z3 [2 ~0 T3 L1 p# J9 W8 tWhen the glow-wire test of IEC 60695-2-11 is carried out, the temperatures are& T! |5 O, H3 ^2 j& [1 @; i4 ^3 Y
– 750 °C, for connections that carry a current exceeding 0,5 A during normal operation,/ ?# H5 J' @4 s9 {% r; d
– 650 °C, for other connections.+ q7 t) d m3 h( x) @4 e& K
NOTE 2 Contacts in components such as switch contacts are considered to be connections.
6 I5 o1 Y) \ v8 o, w4 U! gNOTE 3 The tip of the glow-wire should be applied to the part in the vicinity of the connection.8 e0 f. ?. B/ C9 |3 S
This test is not applicable to:1 Z8 R4 j7 ^' k; O8 Y8 x% ?& Q
– parts supporting welded connections;
7 F! _/ I4 G$ d4 q– parts supporting connections in low-power circuits described in 19.11.1;6 Y& {; T$ ?3 |' A# V* P }
– soldered connections on printed circuit boards;
. G/ w* a+ c. X v, k+ \* F5 x Q– connections on small components on printed circuit boards;+ F1 t+ N; n: W
and parts within 3 mm of any of these connections.# s, W" P. K& F" i% G- J# ]3 _; _
NOTE 4 Examples of small components are diodes, transistors, resistors, inductors, integrated circuits and capacitors not directly connected to the supply mains.! t+ @* L. w) u
It is also not applicable to:
) J$ ~ z* y8 T2 X3 S4 @6 d– hand-held appliances;
3 n9 r! u+ @) j! X– appliances that have to be kept switched on by hand or foot;
+ V0 \" X) ]+ ?$ Z, _– appliances that are continuously loaded by hand.
* U* I7 V) z8 b T2 k# Q（IEC 60335-1-2006 Clause 30.2.2） |
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发表于 2007-6-1 21:07
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