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

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PDSH 1023 : J* T0 c+ Z% h# Q  Y 7 S( @, W/ L* U) n7 R

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

17.1.1C, 13.4

61558-1(ed.1);am1 & 61558-1(ed.2);am1 & 60529 all editions : Z+ _% v" a. d1 {) R

Standard(s):
IEC 61558-1
/ H( P$ ]; H' |0 \& xIEC 60529
All editions
/ d  z6 k$ ^7 k3 qSubclause(s):
17.1.1C
; E& w  o. u! [13.4
# y' l6 ~# G' r. z# V) _2 ]( {No. Year
PDSH
  T' w. M. w0 |1 r1023 2010
Category: SAFE Developed by: ETF5
OSM/LUM
1 ^. }5 g8 D; YSubject:
0 U1 U# G/ x! g( D" [+ WDust test for IP 5X and 6X as
; a' o! o7 j1 d8 F. V' P0 Fdescribed in the transformer
standard
Key words:
& |- M: {* L8 ]5 x' D- Transformers
- Dust test
- IEC 60529
To be approved at the 49th
4 K% N5 K' q& o8 P( oCTL 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
, ^5 S# S2 S2 n- F- n, q1 ]/ Q8 r1 hdescription of the dust divagate a bit as the following wording is added: “and shall have a range of particle
9 G. f" E0 K9 [$ g" c0 I( @: d0 gsize down to and including 1 μm with at least 50% by weight less than 5 μm”. This more precise
; l' F7 `% V6 y8 H" adescription 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?
- V& O# B' D: M8 n* wDecision:
/ f( Z% J, O$ q9 IThe horizontal safety function standard IEC 60529 shall be followed, i.e. the dust specified in subclause
) m' H5 P) S& R# B13.4 can be used.