DSH 593 New glow wire test requirments (650 C) for parts close to contacts

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DSH 593 ( Y) V- t" t( V$ D  s

New glow wire test requirments (650 C) for parts close to contacts ; l# Q  {8 j, Y+ g! K

Clause 7.1.1.1 of IEC 60947-1 Clause 21.1.5 of IEC 61058-1 ' r" u6 p% Q: e  \) G: b5 w

61058-1(ed.3) & 60947-1(ed.4) % f* P" h5 D$ j: F3 |

Standard(s)- (year and edition):
IEC 60947-1:2004 IEC 61058-1:2000
Sub clause(s):
! s5 j* \* X, h! ~& @Clause 7.1.1.1 of IEC 60947-1 Clause 21.1.5 of IEC 61058-1
Sheet n°:
DSH 593
% n* m" e! D( {  P* vSubject:
( t& N# N9 F/ Q9 R; \, V1 bNew glow wire test requirements (650 °C) for parts close to contacts
Key words:
- glow wire
! Q$ r) l( v+ t& ^; D( ]5 YDecision approved by the 44th CTL meeting 2007
$ R% N/ ]: }6 p8 }; p8 S" K! EQuestion:
2 D9 {% P/ |# [- |# b! n- v! W) PDue to the new requirements of 60947-1:2004, parts close to contacts are subject to glow wire test performed at temperature of 650 °C. Is a glow wire test necessary for the green part (figure 1) or isn’t a glow wire test required for this part?
Decision:
, f' e8 Q- V0 G0 H% W4 d( O) nAlthough the green part (figure 1) of this switch is mechanically separated from the contact element, the glow wire test should be done with 650 °C. During normal operation, the switching element and the contact element are mounted together. Due to this fact and the relatively large amount of material, a test should be done.
! V  J4 K7 y, s' ]$ S4 t; d0 x