Hi George,
After posting a similar question to Treg about a year or more ago,
and doing some research, I maximized the spacings and incorporated
them into the design practices at a former company. I believe
these spacings will carry your product to just about anywhere
in the world (which
In a message dated 7/1/99, Peter Merguerian writes:
By the way, a transformer is not always needed on a modem. The
new design of modems have capacitors (not required to be
Approved) between the TNV-3 and SELV.
Hi Peter:
It is certainly true that some of the new modem DAA devices use
...@ieee.org
Subject: Hipot requirements 4 TNV circuits
Hello Once Again .. Everyone,
I have a modem product that failed the hipot requirement defined in
cls 6 of 950. My understanding is that an isolation xfmr between Telco
SELV is needed and clearance from Telco gnd is to be 3mm minimum
In a message dated 7/1/99, George Sparacino writes:
I have a modem product that failed the hipot requirement defined in
cls 6 of 950. My understanding is that an isolation xfmr between Telco
SELV is needed and clearance from Telco gnd is to be 3mm minimum. Does
anyone have any other
Hello Once Again .. Everyone,
I have a modem product that failed the hipot requirement defined in
cls 6 of 950. My understanding is that an isolation xfmr between Telco
SELV is needed and clearance from Telco gnd is to be 3mm minimum. Does
anyone have any other general design
George,
Do you have transient voltage surge supressors. Maybe this is why
you failed the hipot. The standard allows you to pass the Impulse
Test in lieu of hipot. Try this method.
Regarding insulation between TNV-3 and SELV/Earth the standard
allows you the following alternatives routes to
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