This is a board that goes into an appliance. The 220V comes from another
location in the appliance, so it does not hook up directly to the 220VAC
line. It is not earthed and I did find out that the applicable standard is
EN60730-1.
The spacing from the 220VAc to another circuit on the PWB is currently 1 mm.
The original design was only for domestic markets, so that was ample spacing
for UL since the board was conformally coated. With the conformal coat I
was able to qualify for Creepage for Degree 1 which is only 0.28 mm at 125V
according to UL 840 Table 6.1.
If you have the applicable standard, can you tell me what the
clearances are for a pollution degree 1? I will also look to purchase my
own copy of the standard.
Thank you for your help!!!
Paul Denomme
> -----Original Message-----
> From: Peter L. Tarver [SMTP:peter.tar...@sanmina-sci.com]
> Sent: Friday, January 24, 2003 11:40 AM
> To: emc-p...@ieee.org
> Subject: RE: DEMKO high voltage spacing requirements
>
>
> Paul -
>
> What is the applicable product standard?
>
> What type of product is it?
>
> What is the application?
>
> Is the 220V mains connected? From somewhere else in a
> primary circuit?
>
> Is the 220V in a secondary circuit?
>
> What levels of insulation are there between this circuit and
> other types of circuits elsewhere in the product?
>
> If in a secondary circuit, is it earthed? Is it a Limited
> Current Circuit?
>
> What other types of circuits are near it that require
> isolation/insulation on the board? Limited Current
> Circuits? TNV? SELV? ELV? Other hazardous voltage
> circuits?
>
>
> Regards,
>
> Peter L. Tarver, PE
> Product Safety Manager
> Sanmina-SCI Homologation Services
> San Jose, CA
> peter.tar...@sanmina-sci.com
>
> > -----Original Message-----
> > From: Denomme, Paul S.
> > Sent: Friday, January 24, 2003 6:27 AM
> >
> > Hi all,
> >
> > I am in the process of designing a board
> > that needs to receive DEMKO
> > approval. This board will have 220VAC directly
> > connected to it through a
> > connector. Can anyone tell me what the spacing
> > requirements would be for
> > this board? The board will be conformally coated
> > to minimize the spacing
> > requirements. Also, anyone have experience
> > regarding issues that may come
> > up in regards to the connector?
> >
> > Any input would be appreciated.
> >
> > Regards,
> >
> > Paul S. Denomme
>
>
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