Hi Christine,
IEC/UL/EN 60950-1 refers to LPS as a Limited Power Source, and is described in
clause 2.5 of that standard. It encompasses a limitation on voltage, but also
includes limiting of current and power as well. There are requirements in the
standard that no longer need to be applied
Hi Christine,
It’s always a joy experiencing part substitutions, eh? And, LPS actually
refers to a Limited Power Source as defined in the IEC60950-1 series.
Anyway, have you had a chance to review the other power supply’s applicable
safety report(s)? Whether it is or is not LPS will be
Hi Christine:
So the $64, dollar question is can you use a non-LPS in place of a LPS
if they have the same rating?
The ratings do not tell you whether the
power supply is LPS or not. The ratings
reflect the maximum normal operation of
the power supply. LPS is a measure of
the output
: emc-p...@ieee.org [mailto:emc-p...@ieee.org]On Behalf Of
Pickard, Ron
Sent: Wednesday, January 21, 2009 10:59 AM
To: Christine Rodham
Cc: emc-p...@ieee.org
Subject: RE: Safety Experts: Limited Voltage Pwr Supplies vs.
Non-Limited Voltage Power Supplies
Hi Christine,
It's always a joy experiencing
In message 0205DDD6A6B4430DAF366BE26E352BAD@PC323541548743, dated Wed,
21 Jan 2009, rn...@san.rr.com writes:
If the power supply has the LPS marking,
then you KNOW the power supply is LPS.
.. unless it's sourced from the proverbial Sum Yung Gai Corp. We have a
report of a LARGE quantity of
List Members,
Thanks for all the great replies!
Would it make sense to see if the end product can pass safety with the non-LPS
power supply?
Is the the LPS clause just a CB scheme requirement or is it required for NRTL
approval also?
Best regards,
Christine Rodham
Christine Rodham
...@intermec.com mailto:ron.pick...@intermec.com
From: emc-p...@ieee.org [mailto:emc-p...@ieee.org] On Behalf Of Christine
Rodham
Sent: Wednesday, January 21, 2009 2:38 PM
To: emc-p...@ieee.org
Subject: Re: Safety Experts: Limited Voltage Pwr Supplies vs. Non-Limited
Voltage
Hi Christine:
Would it make sense to see if the end product can pass safety with the
non-LPS power supply?
Probably not. A major requirement (with
a major expense) is that your end-product
enclosure will need to meet the requirements
for a fire enclosure. If the end-product
enclosure is
Sent: Wednesday, January 21, 2009 12:38 PM
To: emc-p...@ieee.org
Subject: Re: Safety Experts: Limited Voltage Pwr Supplies vs.
Non-Limited Voltage Power Supplies
List Members,
Thanks for all the great replies!
Would it make sense to see if the end product can pass safety
with the non-LPS power
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