DSH 592/06 Dust test for IP 5X and 6X as described in the transformer standard

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DSH 592/06 + q/ r! X+ g, T# i4 d ! u" n, j' A* e2 \: `

Dust test for IP 5X and 6X as described in the transformer standard 0 b, ?% P5 ~  i% Z5 Y+ D

17.1.1C, 13.4 % Y7 z6 ?  E2 s1 S

61558-1(ed.1);am1 & 60529(ed.2);am1 0 v* r) g) [, {1 O' ^. X! B+ U

' B& a: A. _: B% }5 W/ jStandard: IEC 61558-1/1997
A1/1998
- z: `, K0 h8 AIEC 60529/1989
A1/1999
Sub clause: 17.1.1C
' O, U/ H4 I4 h/ B1 v. p13.4
7 J; u5 N8 D2 n; k0 Z! \  v& SSheet N°: 592/06
Page: 1(1)
Subject: Dust test for IP 5X and
6X as described in the
7 b) F. l: W" n6 G4 @$ I: L  ptransformer standard
* z4 U7 B% `8 ]% F* NKey words:
- Transformers
- Dust test
' H& T3 p3 T7 o, z- IEC 60529
Meeting:
  \; v* v$ u8 L$ l. r& d. E- l& m8 J. nDecision confirmed
at CTL 42nd meeting
9 g2 |% `" {4 R! C- I9 HQuestion: In the horizontal safety function standard for degree of protection provided by
enclosures (IP code), IEC 60529, a description of the dust is given in subclause
& B; N8 ^  ^! C' A' {) S/ a13.4. However, in the transformer standard the description of the dust divagate a
: |2 d' T3 H4 L; k3 Cbit as the following wording is added: “and shall have a range of particle size
$ Q5 o: q4 C( Pdown to and including 1 +m with at least 50% by weight less than 5 +m”. This
0 E( C5 f$ O; H; N. f9 p3 \more precise description imply that dust in the dust chamber must be changed
when a transformer is tested, this without any technical reasons. For the future,
can we use the dust specified in IEC 60529 also for transformers?
Decision: The horizontal safety function standard IEC 60529 shall be followed, i.e. the dust
4 d3 _! g& y. \& [  V/ Tspecified in subclause 13.4 can be used.

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$ `# X2 P. e7 K. Y) m, s7 o, H