ground
connection.
Best regards,
David.
- Original Message -
From: j...@aol.com
To: gelf...@memotec.com
Cc: emc-p...@majordomo.ieee.org
Sent: Thursday, December 21, 2000 11:34 AM
Subject: Re: TNV to Earth Insulation Requirement
Hi David:
Thanks for the feedback
In a message dated 12/21/00, you write:
He also said that meeting the 500 V ac or 707 V dc requirement was not
Hi David:
Thanks for the feedback. Can you elaborate on the reference above to the
500 VAC or 707 CDC requirement? What clause does this requirement derive
from? Was your CSA
Joe,
Your post came exactly when I was preparing to submit a product powered by -48
V dc source. I have always wondered why it should be necessary to have
isolation in this situation, where is the inherent danger? Following your
arguments, I submitted this to my CSA rep, who agreed with me
In a message dated 12/12/00, Peter Merguerian writes:
Assume you have equipment with external power earthed (Class 1) power
supply with an earthed appliance inlet for conenction to the mains. The
power supply output is connected to a dc unit with a TNV-2 interface with
no separation to SELV.
Dear All,
Assume you have equipment with external power earthed (Class 1) power
supply with an earthed appliance inlet for conenction to the mains. The
power supply output is connected to a dc unit with a TNV-2 interface with
no separation to SELV. The dc unit has a earth stud for connection of
In a message dated 12/11/00, Dave Lorusso writes:
If a telecom product is permanently connected (-48 Vdc Central Office
Equipment), is it exempt from paragraph 6.3.3 Separation of the
telecommunication network from earth, of UL 1950? I'm reading this as there
is no physical spacing required
Group,
If a telecom product is permanently connected (-48 Vdc Central Office
Equipment), is it exempt from paragraph 6.3.3 Separation of the
telecommunication network from earth, of UL 1950? I'm reading this as there
is no physical spacing required between TNV and Earth for permanently
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