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| DSH 752
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| Definition of a flame for glow wire test
2 l: s: n# k, {- M6 I | 11-12
# K! H# Y5 |. Z G0 N: G3 h | 60695-2-11 & 60695-2-12 & 60695-2-13
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Standard(s): No. Year8 t( @5 Z, y! _5 j( b. |
IEC 60695-2-11
1 a* U7 @ T7 |* `7 N G, i AIEC 60695-2-12/ x7 P4 V; C" N+ A. ?
IEC 60695-2-131 v( b" b5 f- F- \
DSH 0752' s& M- X R+ s9 X5 L* t$ e
2009
. w3 J7 l2 _7 f9 s7 b7 vCategory:# f$ | b& f% L0 A$ O, k( D
VARIOUS - GENERAL
* _% m/ D, N2 w* y M; `Sub-clauses:
: C/ [/ ?2 g/ t8 b0 i11 - 12
- b7 J6 N l$ x) ~$ Z! N! qDeveloped by:
- ~ H% m- v: F+ C1 w: bWG4 – WG2
2 o* X4 f) A$ o2 ~. l8 aSubject:' t2 o' I: d3 g- i- q& E: K
Definition of a flame for glow n5 l7 @4 U( l0 g8 o* G7 k' V
wire test
5 I7 C# O$ v% M IKey words: r* Q9 [9 E M
- Glow wire test: f1 I* g7 s% G1 V3 z& N: C* ]
- Flame
& Z9 u4 E3 B; t+ O0 }8 ~9 b- Corona Effect
" K) f: l# W3 B- Ionized gasses4 @' w @! n* t! l! T/ M$ c
- Ignition of the sample6 `& \0 I! k: }1 Y0 ?, v: i) x
Approved at the 47th CTL4 a, g" l. {* ^( h5 y4 t- y$ M+ l
Plenary Meeting, year 2010.9 f" c! Y9 D1 g0 [# |! `
Question:: o, O3 j; D! w. k+ h
How is the “Corona-Effect” to be interpreted when performing the Glow Wire Test?
) D* ], a6 v7 _/ i& @Decision:
# W( o/ Z, U; Z, P1 [6 |8 vDuring the glow wire test (according to the temperature settings required by the standard), the
% t$ x# w; U- _3 w2 {following phenomena can occur:
7 M4 ?4 M4 P, q+ ?! }3 j( V n1 x$ c1. If a brightly shining flame is observed directly at the test specimen (see picture 1), this is a' ]+ v( g4 T6 j9 S4 p
clear indication of an ignition. Some materials show a colourless transparent flame& g) P( c4 X3 P e+ \7 r
instead of a bright shiny flame. This is considered to be ignition of the test specimen, if the( H4 S" x3 f* n: h9 }* Q4 M; j! m
maximum flaming time allowed by the standard is exceeded.
! {- K7 C# k% T) e3 [2. Sometimes, a circular corona can be observed around the tip of the glow wire, see picture
; {, U, r$ K5 H$ ]) }' [& ~2. This corona consists of ionized gas, predominantly blue in colour and is located in the& g" [3 Y1 K; {
immediate vicinity of the glow wire. This phenomenon is not considered to be ignition of: y- S3 G" u6 N$ a+ Z1 g; A
the test specimen, as long as it does not lead to an ignition of the test specimen according) k; z" E( x* m3 b) z4 I
to point 1.' x9 T X. s$ T" O: k
3. Furthermore, ionized gasses can sometimes be noticed along the glow wire (see picture* G4 i _- E$ q, [! q; s9 N5 F
3). This effect is also not considered to be ignition of the test specimen, as long as it does
! O' c8 C. r) n* Znot lead to an ignition of the test specimen according to point 1.
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