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glow-wire test 的总定义：% o5 [6 j! Q, q, i$ K- v
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Parts of non-metallic material shall be resistant to ignition and spread of fire.
- m1 b% z3 `/ |. A& |1 A) BThis 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）
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再看：
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# O' R# Z: L' U30.2.2 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
: p- K2 s0 ~8 ?6 Fof 3 mm of such connections, are subjected to the glow-wire test of IEC 60695-2-11.
4 W( O% A& Y% G; ]0 x; ?! V/ D6 WHowever, the glow-wire test is not carried out on parts of material classified as having a glowwire
" a" I4 f! m7 L3 rflammability index according to IEC 60695-2-12 of at least- a3 D# G" X' P0 p) T9 \
– 750 °C, for connections which carry a current exceeding 0,5 A during normal operation,+ h ~- a; Y) D- g
– 650 °C, for other connections.
z" c+ G2 K& Z9 k% C3 t/ C3 MIf the glow-wire flammability index is not available for a sample with a thickness within
% }. `! w0 [1 {6 Q! Y4 U7 x& J± 0,1 mm of the relevant part, then the test sample shall have a thickness equal to the nearest' Z( V+ M0 h3 i# _; l. P' d) K
preferred value specified in IEC 60695-2-12 that is no thicker than the relevant part.: i6 b" L8 r4 v- M; Z' M' ` l
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.5 D$ f% n! U% S( M
Where a non-metallic material is within 3 mm of a current carrying connection, but is shielded* H; I( c7 T! T$ X4 R) n
from the connection by a different material, the glow-wire test of IEC 60695-2-11 is carried out
0 b j- e1 i. K& k% U9 Mat the relevant temperature with the tip of the glow-wire applied to the interposed shielding
/ o4 X: ]' s. @' c" ^material with the shielded material in place and not directly to the shielded material.
4 O# D9 f0 E8 s/ {' U$ C; A# F- `When the glow-wire test of IEC 60695-2-11 is carried out, the temperatures are
$ B: q9 {0 j6 u* o$ F1 O8 A– 750 °C, for connections that carry a current exceeding 0,5 A during normal operation,8 G) @5 F& p$ ]& X: b9 U2 Y
– 650 °C, for other connections.2 X. p6 K: a9 f; L, R
NOTE 2 Contacts in components such as switch contacts are considered to be connections.% M. h* f( B* O: p \
NOTE 3 The tip of the glow-wire should be applied to the part in the vicinity of the connection.
4 i+ P' Q- V1 f& jThis test is not applicable to:9 s# E% c" J3 j* j S4 ]
– parts supporting welded connections;7 ]; Z, |6 h% d9 r% l X" F
– parts supporting connections in low-power circuits described in 19.11.1;) Z* [4 l7 \1 ~! K# S
– soldered connections on printed circuit boards;9 H, r5 {6 ^, v
– connections on small components on printed circuit boards;
; m- }: X. ?* M* L0 P( X! e% Z! m2 ^and parts within 3 mm of any of these connections.; e. }5 P% m8 v! j, K0 y8 l7 P
NOTE 4 Examples of small components are diodes, transistors, resistors, inductors, integrated circuits and capacitors not directly connected to the supply mains.% v) L7 l" y4 w
It is also not applicable to:* K; r- i" @* A4 @: O
– hand-held appliances;
% L- r' N0 B( d8 x3 F– appliances that have to be kept switched on by hand or foot;& p% W0 }/ Z/ R/ g! E2 Q- Q# z
– appliances that are continuously loaded by hand. / e% m9 x$ F. d1 M; X$ t& \8 T/ H! J
（IEC 60335-1-2006 Clause 30.2.2） |
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发表于 2007-6-1 21:07
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