It's over on Bizarre Street.
At 10:33 AM 10/24/2001 , Cortland Richmond wrote:
telephone products destroyed by all sorts of bazaar events
Where IS that bazaar? (grin)
Cortland
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This message is from the IEEE EMC Society Product Safety
Technical
telephone products destroyed by all sorts of bazaar events
Where IS that bazaar? (grin)
Cortland
---
This message is from the IEEE EMC Society Product Safety
Technical Committee emc-pstc discussion list.
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To: gkerv...@eu-link.com; phopk...@ga.conklincorp.com;
emc-p...@majordomo.ieee.org
Subject: Re: TNV Circuits
In a message dated 10/23/01, Gregg Kervill writes:
Have lines ever been struck by Lightning?
One of my clients had a cupboard full of telephone products destroyed by
all sorts
In a message dated 10/23/01, Gregg Kervill writes:
Have lines ever been struck by Lightning?
One of my clients had a cupboard full of telephone products destroyed by
all sorts of bazaar events - like the temporary three phase power line to a
factory that fell' across domestic phone
...@majordomo.ieee.org
[mailto:owner-emc-p...@majordomo.ieee.org]On Behalf Of j...@aol.com
Sent: Tuesday, October 23, 2001 12:37 PM
To: phopk...@ga.conklincorp.com; emc-p...@majordomo.ieee.org
Subject: Re: TNV Circuits
In a message dated 10/23/01, Perry Hopkins writes:
My question
Perry -
A note of general concurrence with Joe's take on your
circuits. The various DSL power feeds are at this time
treated as hazardous voltage circuits. There is activity in
IEC, TC47, to consider requirements for remote feeding
circuits, but publication is not imminent.
The UL/CSA
In a message dated 10/23/01, Perry Hopkins writes:
My question is; by definition, shouldn't the DSL circuits fall under the
TNV-3 and not Hazardous Voltage secondary circuit. The major difference is
when you are determining the creepage and clearance distances. At TNV-3
you are allowed
Currently, we have a product undergoing UL60950 approval and there seems to
be some debate about the classification of the TNV voltages. Our product
has the following TNV circuits: T1, a POTS modem line and DSL w/span power
(up to 190Vdc). The approval agency is classifying the circuits
forwarding for jay_johansme...@3com.com
Reply Separator
Subject:Re: Fuses and isolators for TNV circuits
Author: jay_johansme...@3com.com
List-Post: emc-pstc@listserv.ieee.org
Date: 6/29/00 8:18 AM
Hi Chris,
Why not use a re-settable fuse
of a particular brand or style of GMT or grasshopper
fuses approved for TNV circuits?
With regard to isolators:
According to GR-1089, my circuit will be required to pass a 5KV surge
non-operationally. I'm worried about the optoisolator that I'm looking
at. They specify 8mm spacing, but only specify
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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