PDSH 1023 Dust test for IP 5X and 6X as described in the transformer standard

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PDSH 1023 2 i0 o/ i% e* n+ }% U  t

Dust test for IP 5X and 6X as described in the transformer standard 9 {. B# Y7 a: q7 P. @! q2 j

17.1.1C, 13.4

61558-1(ed.1);am1 & 61558-1(ed.2);am1 & 60529 all editions 7 L0 F1 d# G0 p; |  Z5 _

4 ~7 u6 g% y1 G1 J* QStandard(s):
IEC 61558-1
+ ^- ]- |* g; g+ p7 T# `7 S# R5 kIEC 60529
All editions
- a; A2 X3 L, I) k) f" |Subclause(s):
0 ?% s# \. B6 ^. [% d* o# z& y17.1.1C
13.4
No. Year
PDSH
1023 2010
Category: SAFE Developed by: ETF5
% K7 g6 N8 ?1 j& Y/ _OSM/LUM
Subject:
Dust test for IP 5X and 6X as
' @$ l4 \8 F5 Q$ E  pdescribed in the transformer
1 v, Q' ^; h5 V2 m  H% \standard
Key words:
, d7 T, E! f: u( I- Transformers
- Dust test
- IEC 60529
To be approved at the 49th
CTL Plenary Meeting, in 2012
Question:
2 W  ~/ S$ Z% d/ UIn 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 13.4. However, in the transformer standard the
& I# ~8 q( G) {( M+ P0 f4 G/ X0 ddescription of the dust divagate a bit as the following wording is added: “and shall have a range of particle
size down to and including 1 μm with at least 50% by weight less than 5 μm”. This more precise
; j; t- S0 X0 \4 j& S4 Sdescription 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?
- c% p- b: F0 n2 zDecision:
The horizontal safety function standard IEC 60529 shall be followed, i.e. the dust specified in subclause
13.4 can be used.
5 k# `7 i2 S- `% a3 Y. D7 g2 A, A
6 V; l# A0 X( j  m
0 M6 K. _- _8 J7 {