DSH 592/06 Dust test for IP 5X and 6X as described in the transformer standard

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DSH 592/06 % f( w* |4 y; O" r6 a

Dust test for IP 5X and 6X as described in the transformer standard " b, J( h- D" l, }7 `2 o+ t/ g

17.1.1C, 13.4

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

Standard: IEC 61558-1/1997
A1/1998
IEC 60529/1989
A1/1999
Sub clause: 17.1.1C
+ |- ]. a" X2 A; I7 O, m13.4
Sheet N°: 592/06
Page: 1(1)
: ?( Y, T) K. Z1 M6 K, kSubject: Dust test for IP 5X and
6X as described in the
transformer standard
Key words:
% m6 Q! ^  T& \' _$ y- Transformers
, D9 g. [9 o( m2 y- {- Dust test
; `3 S+ i, F. w. z+ b6 b) L+ G& K- IEC 60529
; S& o8 k5 ]% {6 ]4 [1 xMeeting:
Decision confirmed
at CTL 42nd meeting
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
6 l3 ]2 o( c1 N" Y1 ^# @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
$ [3 F! Q; h# E& |- F: |down to and including 1 +m with at least 50% by weight less than 5 +m”. This
% `; {3 i4 K. Bmore 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?
Decision: The horizontal safety function standard IEC 60529 shall be followed, i.e. the dust
specified in subclause 13.4 can be used.
2 C$ _+ M# I+ |4 r  u
% V2 {5 _9 v0 U# B, @+ _! Y
- d1 m" s3 D7 n% c, Z