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| DSH 752
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3 Q" r' ^/ V' m7 `2 U# ?- k' G1 } | Definition of a flame for glow wire test' L* e: G% q, o# w% u( `5 H
| 11-12
' t7 I# n) |( j2 X | 60695-2-11 & 60695-2-12 & 60695-2-13
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Standard(s): No. Year$ R& k; _6 C- |# L' C& w
IEC 60695-2-11
- I/ Z. C3 z# B; A' z# cIEC 60695-2-12
1 D3 m! k/ s2 j9 g' G" j8 r+ PIEC 60695-2-13
* l/ G6 D8 H( O- G- n: v6 [6 mDSH 0752+ i7 W& i& p7 B8 O4 v9 ~
2009
) ]' |, _( H2 x$ i& p) x" j3 |$ WCategory:
2 l( v) H7 M, s+ p2 A9 i5 R r/ KVARIOUS - GENERAL
, n+ U- ~# C* w5 F5 x JSub-clauses:0 N! V7 J% Q* V, i
11 - 12
B3 ]4 l1 h7 P* B9 ]6 cDeveloped by: u* y7 B4 ]5 V/ k5 G; j
WG4 – WG23 s8 S! |" U, [5 y# s: ^1 O2 r
Subject:
9 q$ w3 b, i3 oDefinition of a flame for glow# [" v- P" |! W1 ?7 y
wire test+ a) K, J/ H% j8 x( V) T9 K8 W
Key words:
! T+ R" \; |$ h6 M+ g1 D7 N# k$ D- Glow wire test, A# H7 ^9 z4 N( s9 y
- Flame
* x5 N! c0 z8 F5 ~8 A. z% d- Corona Effect
$ ?7 n/ Y) [" t8 `1 d- Ionized gasses6 |+ a6 c3 L! y& _
- Ignition of the sample
0 p$ u( ?" H" z6 DApproved at the 47th CTL7 {- ]+ E4 }9 `- K
Plenary Meeting, year 2010.7 x/ r& l' Z3 P4 w" y/ I8 X3 f
Question:
* C; V0 r8 `$ [; v1 T# g- T3 {How is the “Corona-Effect” to be interpreted when performing the Glow Wire Test?4 R( d; L/ k3 z1 ?- p2 J* }
Decision:
2 ~4 T: {4 Z( U$ N: f2 M1 R. E8 X! oDuring the glow wire test (according to the temperature settings required by the standard), the) O; Z9 {$ v+ k- Q* }0 b. m8 l7 _
following phenomena can occur:
% U6 n9 c: ]# |3 o2 M3 n1. If a brightly shining flame is observed directly at the test specimen (see picture 1), this is a) v: T; S( y1 N
clear indication of an ignition. Some materials show a colourless transparent flame
- {. ~) \. @( C3 c" u2 kinstead of a bright shiny flame. This is considered to be ignition of the test specimen, if the7 N% X# v1 U8 [/ R; _! ^' L
maximum flaming time allowed by the standard is exceeded.
& ^5 y' y- I8 ?) F2. Sometimes, a circular corona can be observed around the tip of the glow wire, see picture4 [* R# q3 n! e, Y) {$ A
2. This corona consists of ionized gas, predominantly blue in colour and is located in the7 B, m: w7 n+ c) J) @( _( Q/ Y
immediate vicinity of the glow wire. This phenomenon is not considered to be ignition of
8 x4 Q. W9 Z! H1 }# w0 i( \2 gthe test specimen, as long as it does not lead to an ignition of the test specimen according
5 O6 D' x- L. a6 }" Uto point 1.2 |( [* R* j8 E5 [
3. Furthermore, ionized gasses can sometimes be noticed along the glow wire (see picture
* }, A1 V* m# ?# m! a4 k8 a. G3). This effect is also not considered to be ignition of the test specimen, as long as it does
3 h ^( W$ a* G* A( Wnot lead to an ignition of the test specimen according to point 1. g; R% O4 [3 I
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