In the case of IEC 61010 equipment, there are two possibilities for connection
to mains and the respective overvoltage categories.
A voltmeter can be connected to a Category II mains for operating power. In
this case, a Cat II power supply will be acceptable.
The same voltmeter can be connected to a Category III or IV mains for measuring
voltage. In this case, the measuring circuits must have the suitable Cat
rating.
For good discussions see:
http://media.fluke.com/documents/1263690_6003_ENG_J_W.PDF
http://cp.literature.agilent.com/litweb/pdf/5990-4578EN.pdf
Best wishes for the holiday season,
Rich
-----Original Message-----
From: Doug Powell [mailto:doug...@gmail.com]
Sent: Wednesday, December 17, 2014 8:24 AM
To: EMC-PSTC@LISTSERV.IEEE.ORG
Subject: Re: [PSES] 60950-1 PSU in a 61010-1 product
Brian,
All quite true and it has been a bit of a problem when working with clients who
assume that if the PSU has any kind of an agency monogram, it must be okay.
One other area of concern, often overlooked, is the application of overvoltage
(formerly measurement) categories. Although 60950 is not very explicit in
this regard, you can see that it's spacings are based in category II only.
Meanwhile 61010-1 has the possibility of category III. If the client insists
on using a Cat II PSU in a Cat III application, the only solution is to do
category reduction prior to the PSU.
Finally, there are altitude requirements for greater than 2000 meters.
Finding 60950-1 PSU certified to 3000 meters is extremely difficult.
Thanks, - doug
Douglas Powell
http://www.linkedin.com/in/dougp01
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