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

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DSH 593

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

Clause 7.1.1.1 of IEC 60947-1 Clause 21.1.5 of IEC 61058-1 8 U7 g* d+ d2 X2 F# \" F

61058-1(ed.3) & 60947-1(ed.4)

+ K- k" E5 v5 Z9 o1 q& W9 |( sStandard(s)- (year and edition):
) o% t; N9 Q! A8 {  B4 ^IEC 60947-1:2004 IEC 61058-1:2000
Sub clause(s):
& a; ], w4 ]; F* d1 g1 [% MClause 7.1.1.1 of IEC 60947-1 Clause 21.1.5 of IEC 61058-1
) V6 W# X0 ]* z" o& ^3 jSheet n°:
DSH 593
: w: a  n8 x. L0 s( D6 h. {! dSubject:
# r/ n6 g* ~0 k; a$ F( b- ONew glow wire test requirements (650 °C) for parts close to contacts
Key words:
; L" j+ f. L8 M7 [- glow wire
3 v  }$ \( M( o4 t0 ZDecision approved by the 44th CTL meeting 2007
! p" i6 ]2 X( i9 n- P! s5 WQuestion:
Due 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:
Although 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.
' R1 F8 E9 L1 |7 C
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