Rich -
While I can't speak for Chris, there are a few reasons to
perform production line ESTs on 48V dc mains powered
equipment.
1) in 48Vdc SMPSs, the voltages present on transformer
insulation are typically in excess of ELV limits. If the
power supply has had fault testing performed that clea
Gary
-Original Message-
From: Rich Nute [mailto:ri...@sdd.hp.com]
Sent: Monday, November 12, 2001 4:34 PM
To: chris.maxw...@nettest.com
Cc: emc-p...@majordomo.ieee.org
Subject: Re: HiPot testing of DC mains powered products
Hi Chris:
I wonder why you need to hi-pot test a SELV-powered
product
Hi Chris:
I wonder why you need to hi-pot test a SELV-powered
product? (I presume your external 48-volt dc source
is SELV.)
We make products intended for connection to an external
dc source (SELV). We have never been required to
perform a hi-pot test on such products.
The production-line
Hi Chris,
I understand it may be an agency requirement to hipot, but I am not sure
that a hipot test would necessarily reveal potential insulation
failures/faults that would lead to the type of hazard you indicated.
Surely these hazards have already been addressed in the design/type-testing
ph
Chris,
You should test the unit including your custom cable assembly as a complete
system. For a 48 V niminal product, the voltage is 700 Vdc for min. 1
second.
This e-mail message may contain privileged or confidential information. If
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Chris,
In my opinion you should perform the test with the cable that you ship. Your
explanation for the second scenario states exactly why this should be done.
Scott Lacey
-Original Message-
From: owner-emc-p...@majordomo.ieee.org
[mailto:owner-emc-p...@majordomo.ieee.org]On Behalf Of Ch
avehe...@mediaone.net]
> Sent: Tuesday, November 06, 2001 3:08 PM
> To: Chris Maxwell
> Cc: EMC-PSTC Internet Forum
> Subject: Re: HiPot testing of DC mains powered products
>
> Chris,
> Greetings! You may not even need to perform production line hipot
> if
> th
Chris,
Greetings! You may not even need to perform production line hipot if
the unit is a fiber only product. Since the mains are SELV (unless you
are shipping to certain Euro Telco's) the only time you should need
production line hipot is if you have wired (TNV-2 or TNV-3) interfaces,
assumin
AM
To: 'Chris Maxwell'; EMC-PSTC Internet Forum
Subject: RE: HiPot testing of DC mains powered products
If you conduct the functional tests of the chassis
with the DC cable that ships with it, then it's
not much of a hassle and you know that the whole
package is fine.
If you mer
If you conduct the functional tests of the chassis
with the DC cable that ships with it, then it's
not much of a hassle and you know that the whole
package is fine.
If you merely insert the cable during packing for
shipment, consider doing a hi-pot on the cable itself
on it's production line.
P
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