Ethernet transformwer with 4kV isolation

is there such a beast?

My ethernet circuit floats at ~ 240AC mains and I'd like to use the Ethernet 
transformer for Isolation.

Most I have seen is 1kV

Or should I look else where to put my Isolation barrier.

Regs
Joe 

On Mar 28, 1:00=A0am, "Joe G \(Home\)" <jo...@optusnet.com.au> wrote:
> is there such a beast?
>
> My ethernet circuit floats at ~ 240AC mains and I'd like to use the Ether=
net
> transformer for Isolation.
>
> Most I have seen is 1kV
>
> Or should I look else where to put my Isolation barrier.


This just screams "fiber."

<robertwessel2@yahoo.com> wrote in message 
news:de55cea7-2a28-4279-a54b-b34f0e0c8b4c@d16g2000yqd.googlegroups.com...
On Mar 28, 1:00 am, "Joe G \(Home\)" <jo...@optusnet.com.au> wrote:
> is there such a beast?
>
> My ethernet circuit floats at ~ 240AC mains and I'd like to use the 
> Ethernet
> transformer for Isolation.
>
> Most I have seen is 1kV
>
> Or should I look else where to put my Isolation barrier.


This just screams "fiber."

==> Joe ==>  Can you suggest low cost fiber solution?

What key word should I be search in Google for?

Regards
joe 

On Mar 28, 2:31=A0am, "Joe G \(Home\)" <jo...@optusnet.com.au> wrote:
> <robertwess...@yahoo.com> wrote in message
>
> news:de55cea7-2a28-4279-a54b-b34f0e0c8b4c@d16g2000yqd.googlegroups.com...
> On Mar 28, 1:00 am, "Joe G \(Home\)" <jo...@optusnet.com.au> wrote:
>
> > is there such a beast?
>
> > My ethernet circuit floats at ~ 240AC mains and I'd like to use the
> > Ethernet
> > transformer for Isolation.
>
> > Most I have seen is 1kV
>
> > Or should I look else where to put my Isolation barrier.
>
> This just screams "fiber."
>
> =3D=3D> Joe =3D=3D> =A0Can you suggest low cost fiber solution?
>
> What key word should I be search in Google for?


"ethernet optical transciever"

If you can live with fast Ethernet, something like an Avago
AFBR-5803AQZ is about $30 in small quantities.  Or Gb Ethernet with
something like an AFBR-53D5Z is about $50.  I think you can probably
find fast Ethernet parts down to about $20 (but don't put too much
stock in that - in either direction).

If you have just one or two problematic installations, an external
copper-to-fiber converter ($100-$200 each for GigE) or two is a simple
way to deal with the problem.

Joe G (Home) wrote:
> is there such a beast?
>
> My ethernet circuit floats at ~ 240AC mains and I'd like to use the Ethernet
> transformer for Isolation.

Are you saying that you have one ethernet phy at
earth potential, a second at ~240VAC and the cable
floats?  Can you use a gas tube surge suppressor
on the cable pairs to earth ground?

> Most I have seen is 1kV
>
> Or should I look else where to put my Isolation barrier.
>
> Regs
> Joe
>
>

>> My ethernet circuit floats at ~ 240AC mains and I'd like to use the
>> Ethernet transformer for Isolation.
 
> Are you saying that you have one ethernet phy at earth potential, a
> second at ~240VAC and the cable floats?  Can you use a gas tube surge
> suppressor on the cable pairs to earth 

Surely you've heard of Ethernet over Power?

-- 
mac the naïf

On 2011-03-28, mac <alex.colvin@valley.net> wrote:
>>> My ethernet circuit floats at ~ 240AC mains and I'd like to use the
>>> Ethernet transformer for Isolation.
>  
>> Are you saying that you have one ethernet phy at earth potential, a
>> second at ~240VAC and the cable floats?  Can you use a gas tube surge
>> suppressor on the cable pairs to earth 
>
> Surely you've heard of Ethernet over Power?

No, but I've heard of Power over Ethernet.  That's only 48VDC
though...

mac <alex.colvin@valley.net> wrote:
>>> My ethernet circuit floats at ~ 240AC mains and I'd like to use the
>>> Ethernet transformer for Isolation.
>  
>> Are you saying that you have one ethernet phy at earth potential, a
>> second at ~240VAC and the cable floats?  Can you use a gas tube surge
>> suppressor on the cable pairs to earth 
> 
> Surely you've heard of Ethernet over Power?

Forgot the ;)


-- 
mac the na&iuml;f

Joe G (Home) wrote:
> is there such a beast?
> 
> My ethernet circuit floats at ~ 240AC mains and I'd like to use the Ethernet 
> transformer for Isolation.
> 
> Most I have seen is 1kV
> 
> Or should I look else where to put my Isolation barrier.
> 

You can get medical grade isolation transformers for Ethernet. Not sure
how much this one costs but they are usually well north of $100:

http://www.baaske-medical.de/product_info.php/info/p478_Netzwerk-Isolator-MED-MI-1005.html/XTCsid/uclhpdj0bctjeufg6sf7pkjkn4

You'd have to ask them where they can be bought in Australia. Or maybe
you guys have local suppliers for such transformers. The IT department
of a large hospital might know.

But I am not sure your 240VAC floating setup is legit in the first place.

-- 
Regards, Joerg

http://www.analogconsultants.com/

"gmail" domain blocked because of excessive spam.
Use another domain or send PM.

Joerg wrote:

> You can get medical grade isolation transformers for Ethernet. Not sure
> how much this one costs but they are usually well north of $100:
>
> http://www.baaske-medical.de/product_info.php/info/p478_Netzwerk-Isolator-MED-MI-1005.html/XTCsid/uclhpdj0bctjeufg6sf7pkjkn4
>
> You'd have to ask them where they can be bought in Australia. Or maybe
> you guys have local suppliers for such transformers. The IT department
> of a large hospital might know.
>
> But I am not sure your 240VAC floating setup is legit in the first place.

IMHO, I don't think it would pass UL, CE or CSA without
approved high side components and creepage distances.

Then there's the issue of the cable and connector insulation
and touch distances...