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

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PDSH 1023

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

17.1.1C, 13.4 : n$ H5 n8 |* C( J6 B0 p- @

61558-1(ed.1);am1 & 61558-1(ed.2);am1 & 60529 all editions * n  X% [% \9 D/ X$ g  u/ {0 F, E7 {

$ }0 c+ c5 d8 c( [5 i6 ~Standard(s):
; g0 d( d  L% ], h7 YIEC 61558-1
. Y: F8 r- }4 Q+ C# i% sIEC 60529
All editions
Subclause(s):
$ ^% x) _1 N0 W& L+ J% J17.1.1C
+ I0 u. I9 X- E13.4
No. Year
, i" d$ \* H7 m+ w, ~8 CPDSH
1023 2010
Category: SAFE Developed by: ETF5
OSM/LUM
; ]6 y: v; d1 N4 t. n9 N9 f% [Subject:
Dust test for IP 5X and 6X as
( y* o8 I2 R8 O' Hdescribed in the transformer
standard
Key words:
- Transformers
3 l% C$ I1 H4 S: q5 h0 y  G- Dust test
- IEC 60529
To be approved at the 49th
CTL Plenary Meeting, in 2012
Question:
7 [% i! Z2 _  eIn 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
& ^2 o$ W! W7 wdescription of the dust divagate a bit as the following wording is added: “and shall have a range of particle
  |% f# F2 X5 Q- e! ^0 Z- x* M4 E, q# osize down to and including 1 μm with at least 50% by weight less than 5 μm”. This more precise
description imply that dust in the dust chamber must be changed when a transformer is tested, this without
, J- @- j( V* e- fany 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 specified in subclause
13.4 can be used.
) `& a* {" d5 P& r( L# e
* ^# k% C& W7 Q( G) ?2 n