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

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PDSH 1023 3 V* R, i! W5 R; H

Dust test for IP 5X and 6X as described in the transformer standard ( ^# O+ w7 Z# H# X

17.1.1C, 13.4

61558-1(ed.1);am1 & 61558-1(ed.2);am1 & 60529 all editions

' i- h1 q( n( B0 oStandard(s):
9 l, L. h, {* F9 h8 H0 h3 l2 pIEC 61558-1
IEC 60529
  W( R5 p9 N: k* Z- H. tAll editions
Subclause(s):
2 h- z. k0 e% w$ D4 P  l  ]0 C! s8 y17.1.1C
" g) A+ A  p2 Y, k0 k9 o9 d13.4
No. Year
; Z4 E1 d7 T+ R- V9 V, GPDSH
1023 2010
Category: SAFE Developed by: ETF5
OSM/LUM
Subject:
4 g1 S0 U: W) m0 x" E6 C) L5 \Dust test for IP 5X and 6X as
$ s; b. b, K1 I, adescribed in the transformer
3 T+ x, ?4 a: _  s5 v* Istandard
) B& C! D$ t9 T- w% JKey words:
- Transformers
- Dust test
- IEC 60529
; C4 C% Z9 O6 }& [- YTo be approved at the 49th
CTL Plenary Meeting, in 2012
0 }7 p! A. O( [) FQuestion:
$ {5 v; }  S5 D. l; G& D( LIn 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
; H) f, C* h  z  V: ^3 T3 U7 ~* Ldescription of the dust divagate a bit as the following wording is added: “and shall have a range of particle
8 z9 [/ |; G/ e  U0 W* a" [size down to and including 1 μm with at least 50% by weight less than 5 μm”. This more precise
, {, C2 W# x% N1 kdescription 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?
, P! Y% m% z" W) f3 v7 sDecision:
The horizontal safety function standard IEC 60529 shall be followed, i.e. the dust specified in subclause
: ^0 B! L. T- W3 g1 p. u7 R13.4 can be used.
  k( ^# c6 U9 V4 Y4 S
2 u8 K# U4 s, A2 y: w3 \! S7 H6 {