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 ; F% U* M6 Q+ e8 K3 ?  V0 a) C; o

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

Standard(s):
IEC 61558-1
  P" e# a! H6 ?9 k8 `IEC 60529
All editions
6 [1 ~8 g5 X) eSubclause(s):
2 Y) }! w" ~# o. Q" {" @7 V0 x4 L0 J$ ^17.1.1C
" G; e3 y4 T* Q  B3 J! ~% F" w13.4
7 V2 R" {0 H* {No. Year
9 {6 E" N! `" M: e- Y8 FPDSH
1023 2010
' u  L0 Q4 V0 A+ x; c' T3 \Category: SAFE Developed by: ETF5
' O- e6 w- l4 p( Z! _2 g/ H  XOSM/LUM
Subject:
9 S+ S- _, I/ b; Q7 ^Dust test for IP 5X and 6X as
described in the transformer
standard
) h" ^  W. l( l" s1 ~8 sKey words:
' K. i8 n) n# t* g. k- Transformers
- Dust test
4 J2 B4 |$ y% y! ?1 j7 {% T. J/ c- IEC 60529
To be approved at the 49th
CTL Plenary Meeting, in 2012
& K6 ]/ p( c$ iQuestion:
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
description 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?
2 `+ C7 x& F: o6 c' `1 YDecision:
The horizontal safety function standard IEC 60529 shall be followed, i.e. the dust specified in subclause
5 v$ J5 x$ v  |1 K13.4 can be used.


1 l$ d$ B/ q( |9 I+ z