Rich,
Many thanks for your clear explanation.
I have two practical issues in below in-line message and look forward to
hearing your comments.
To
c...@netscreen.com
cc
raymond...@omnisourceasia.com.hk, emc-p...@ieee.org
Subject
Re: Class 1 AC/DC adapter
>If the dc output is connected to the PE terminal,
>then the dc output could become live in the event
>of a fault in the basic insulation between mains
>and the PE terminal.
I think it may not be the case in practice. Even the dc output is connected
to the PE, if the basic insulation in the earth terminal should fail, the dc
output still safe. It is because the leakage current will go to the earth path
(low impedance) rather than the dc output + human body path where has much
higher impedance.
>If the adapter is sealed, then the only way to
>test for earth continuity is to check from the
>dc output side to the appliance coupler earth
>terminal.
There is a comment from the supplier that the secondary components are not
supposed to handle 25A current and unforeseen damage (early failure) may
happen. Any comments?
Thanks and regards,
Raymond Li
OSA
