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

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PDSH 1023 , D( o2 z; r! q+ f' B4 E( ^

Dust test for IP 5X and 6X as described in the transformer standard , S, a. O" y/ h0 d0 U9 C

17.1.1C, 13.4 # V" J# Y" m' c0 m

61558-1(ed.1);am1 & 61558-1(ed.2);am1 & 60529 all editions ( x8 U: D/ e; Z4 Z( C0 f! {

Standard(s):
1 X# b" b- {( A4 tIEC 61558-1
) o* y9 b, {8 l+ J; e4 MIEC 60529
All editions
Subclause(s):
; p' k( s4 {2 P+ W17.1.1C
13.4
No. Year
5 J- i  G5 ]8 p" R9 EPDSH
" q5 q" a$ E0 P2 i" P1023 2010
1 G2 S' q. X9 d# j6 E" dCategory: SAFE Developed by: ETF5
OSM/LUM
  [0 L& h! A2 mSubject:
# e+ U- y/ E2 hDust test for IP 5X and 6X as
described in the transformer
standard
2 q# W9 v7 t! D$ \' [$ x8 _  ?5 [Key words:
- ?3 c! r& o# X8 d' l- Transformers
; g# @* v  X/ k' o: Z- Dust test
- IEC 60529
To be approved at the 49th
/ o+ P8 {. F) i, n, k1 y" SCTL Plenary Meeting, in 2012
Question:
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 13.4. However, in the transformer standard the
! j/ i) U" [2 M2 g% }. k: j8 Tdescription 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
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?
8 c" `0 A. j+ IDecision:
5 k% f( v/ I4 \1 eThe horizontal safety function standard IEC 60529 shall be followed, i.e. the dust specified in subclause
" q5 k5 N2 m5 K$ A+ q  s13.4 can be used.
" m- I) }8 X+ P: ?: H

3 t: q+ s$ T- ?