[SI-LIST] AW: Re: Rj-45 connectors isolation properties

Jeff,

You are right. ISO/IEC 60950 -safety of IT equipment - (= UL 1950) gives 
requirements for protection against electrical shock. Any surface touchable by 
the user has to be isolated from the telecommunication network voltages (TNV). 
There are both surge and duration tests with voltages up to 2.5 kV.

So be sure that the RJ-45 jack is not the only isolation barrier. Isolation 
shall maintain in case of a single failure.

Thomas Beneken

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Gesendet: Montag, 9. September 2002 18:16
An: jan.vercammen.jv1@xxxxxxxxxxxxxxxx
Cc: si-list@xxxxxxxxxxxxx
Betreff: [SI-LIST] Re: Rj-45 connectors isolation properties



Jan:

Another document is UL 1950, section 6.4, which lists ac test voltages of 1.5kV 
or 1.0kV, depending on your equipment type.  They call it electrical 
separation.  It's main criteria is no breakdown of insulation.

1.5 kV applies on things normally held during use (i.e. handset or keyboard).  
All other equipment is 1.0 kV.  Not sure how to interpret that for pluggable 
cables and devices-perhaps someone on the list has already made that 
interpretation.  I also believe these are peak values and not rms.  I'm not a 
safety expert and invite clarification from those on list who are ....

Hope that helps,

Jeff LaT.

-----Original Message-----
From: Jan Vercammen [mailto:jan.vercammen.jv1@xxxxxxxxxxxxxxxx]
Sent: Tuesday, September 03, 2002 2:50 AM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Rj-45 connectors isolation properties



Hello SI-list,

I have a question concerning the  (electric)  isolation properties of RJ-45
connectors used for 10/100Mbit twisted pair ethernet.

We use an AMP connector (the receptor) and its data sheets states: "the
jack
cavity meets FCC part 68 subpart F".

I have a copy of part 68 code and paragraph 68.304 is about leackage
current
and isolation voltages (between telephone signals and other connections).

I am interested in the electrical isolation. What does this mean in
practice? As
far as I understand it there is a 1000Vrms isolation between the connector
pin(s) and the housing. Or should this be 1500Vrms??

Can anyone provide any details on this??



Kind regards,

Jan Vercammen
EMC/SI Engineering
Agfa-Gevaert
Mortsel Belgium



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