> Hi guys,
>
> thank you for your answers
>
>> Yes, S.E.D. might be a more applicable group.
>
> what is S.E.D.?
>
> Enrico Migliore
>
>
sci.electronic.design
--
Tauno Voipio
Reply by Enrico●September 6, 20112011-09-06
Hi guys,
thank you for your answers
> Yes, S.E.D. =A0might be a more applicable group.
what is S.E.D.?
Enrico Migliore
Reply by ●September 5, 20112011-09-05
On Mon, 05 Sep 2011 07:15:44 -0700, Don Y <nowhere@here.com> wrote:
>Hi Enrico,
>
>On 9/5/2011 1:33 AM, Enrico wrote:
>> I'm designing a flyback transformer of a 25 W power supply.
>>
>> The power supply will be UL tested in Europe. The norm that will be
>> followed is the UL 60950.
>
>Why are you asking this here and not, for example, in s.e.d?
Yes, S.E.D. might be a more applicable group.
Beware of what the UL engineer says though... Whatever sleeve
he is talking about may not be necessary. They will some times
ask you to do things that are not in the UL spec.
This might (or might not) be something that helps to pass the
test. Just don't assume when it comes to UL that everything is
absolutely required.
boB
Reply by ChrisQ●September 5, 20112011-09-05
On 05/09/2011 18:03, dp wrote:
> On Sep 5, 5:15 pm, Don Y<nowh...@here.com> wrote:
>> Hi Enrico,
>>
>> On 9/5/2011 1:33 AM, Enrico wrote:
>>
>>> I'm designing a flyback transformer of a 25 W power supply.
>>
>>> The power supply will be UL tested in Europe. The norm that will be
>>> followed is the UL 60950.
>>
>> Why are you asking this here and not, for example, in s.e.d?
>
> Hmmm, I would think he has better chances here than in SED. He will
> certainly get more replies there, though :D .
>
> Dimiter
The simple answer is that it's probably cheaper to buy in a psu, or use
a wall
wart for the job, unless you plan to build thousands.
Psu companies design this stuff every day of the week and will be adept
at navigating the legislation...
Regards,
Chris
Reply by dp●September 5, 20112011-09-05
On Sep 5, 5:15=A0pm, Don Y <nowh...@here.com> wrote:
> Hi Enrico,
>
> On 9/5/2011 1:33 AM, Enrico wrote:
>
> > I'm designing a flyback transformer of a 25 W power supply.
>
> > The power supply will be UL tested in Europe. The norm that will be
> > followed is the UL 60950.
>
> Why are you asking this here and not, for example, in s.e.d?
Hmmm, I would think he has better chances here than in SED. He will
certainly get more replies there, though :D .
Dimiter
Reply by Don Y●September 5, 20112011-09-05
Hi Enrico,
On 9/5/2011 1:33 AM, Enrico wrote:
> I'm designing a flyback transformer of a 25 W power supply.
>
> The power supply will be UL tested in Europe. The norm that will be
> followed is the UL 60950.
Why are you asking this here and not, for example, in s.e.d?
Reply by Enrico●September 5, 20112011-09-05
Hi,
I'm designing a flyback transformer of a 25 W power supply.
The power supply will be UL tested in Europe. The norm that will be
followed is the UL 60950.
The UL safety engineer told that the Hi-Pot test will be carried out
after leaving the power supply in the humid room for 12 hours at 93%
of humidity.
He suggested me to add sleeving to the transformer.
My question is:
on which leads am I supposed to add sleeving?
Primary? Secondary? Auxiliary?
Thanks,
Enrico Migliore