Hi Ian,
Being new to this forum I have been somewhat reluctant to give my opinion.
However, I do get annoyed when engineers get a bee in their bonnet about
issues that are not really issues.
Having spent the last twenty plus years doing safety testing to IEC 60950-1,
IEC 60065, IEC 61010-1 and various others I find this somewhat bewildering.
My normal approach is to look at what the standard says (as opposed to the
engineer) and in particular find it useful to refer back to definitions.
IEC 60065 states:
"2.3.10 RATED POWER CONSUMPTION
power in watts consumed in an apparatus operating at its RATED SUPPLY
VOLTAGE under normal operating conditions"
So when the audio amplifier is operated at full normal load as specified in
clause 4.2.4 of IEC 60065 it is expected that the maximum power that will be
drawn is 80W.
Clause 5.1 h) states that:
"h) RATED CURRENT CONSUMPTION or RATED POWER CONSUMPTION for
apparatus intended for connection to an a.c. MAINS supply.
The measured consumption at RATED SUPPLY VOLTAGE shall not
exceed the marked value by more than 10%"
My understanding is that the marked value is 80W irrespective of the "Max
Power" and that an actual value of 88W could be permissible in accordance
with the above clause.
There is no text to indicate that this requirement doesn't apply because of
the "Max Power"
Well that's my opinion and I hope it is of some help.
Best regards
Paul Hesp
Senior Safety Engineer
York EMC Services | Three Lane Ends Business Centre | Methley Road |
Castleford | WF10 1PN
Tel: +44 (0) 1977 731173 | Fax: +44 (0) 1977 603181 | Website:
<http://www.yorkemc.co.uk/> http://www.yorkemc.co.uk
Disclaimer: <http://www.yorkemc.co.uk/Disclaimer>
http://www.yorkemc.co.uk/Disclaimer
From: Pete Perkins [mailto:peperkin...@cs.com]
Sent: 22 January 2014 19:01
To: EMC-PSTC@LISTSERV.IEEE.ORG <mailto:EMC-PSTC@LISTSERV.IEEE.ORG>
Subject: Re: [PSES] Rear panel marking
PSNet & Ian,
Having worked with a number of test houses over the last 35
years on lots of products under various standards it is clear that
developing a good (i.e. amiable) working relationship with the lab staff is
key to getting all of your products thru the lab in a timely way.
I have had to go over the lab engineer's head in only one
case in that time; not a bad record from my point of view.
The suggestion to develop a set of compromises to work thru
the issue is a good one. You know your products and their marketplace in
much more detail than the lab engineers; they know the standard and its
usage in a much broader set of circumstances than you see regularly. Each
has something to offer from their perspective.
Altho it can be quite messy getting there, in the end there
will be compromise on both sides; hopefully more so for the manufacturer
but, in any event, resolution in each case.
Hopefully you resolve this quickly and develop a good
relationship with that particular lab engineer; when you do get such a good
relationship work to keep it together by negotiating to get your next
product back to the same person.
I've chosen not to talk about some of the technical details
already addressed - e.g. lab measurement uncertainty, CTL equipment cal
tolerances, etc. but they all apply to the lab and their work nor have I
addressed the intent of the standard which leads to the within 10% over rule
(and is applied broadly across equipment standards). You have a lifetime
project ahead of you if you want to attack these fundamental issues head-on;
not a particularly good approach to get the present product to market in a
timely way.
Good luck in working this thru.
:>) br, Pete
Peter E Perkins, PE
Principal Product Safety Engineer
PO Box 23427
Tigard, ORe 97281-3427
503/452-1201 fone/fax
p.perk...@ieee.org <mailto:p.perk...@ieee.org>
_ _ _ _ _
Dear colleagues.
We have a product that is marked "Max Power 80W" on the rear panel.
I have been informed by the testing agency that this is not compliant with
the requirements of IEC 60065 because the actual power consumption is 82.1W.
The clause in the standard allows for a 10% tolerance but I am told by the
testing agency because the rear panel states Max Power this tolerance
doesn't apply.
Is this correct and can anyone let me know if there is a tolerance figure as
power consumption varies slightly with ac input voltage.
Many thanks in advance.
Ian McBurney
Design & Compliance Engineer.
Allen & Heath Ltd.
Kernick Industrial Estate,
Penryn, Cornwall. TR10 9LU. UK
T: 01326 372070
E: ian.mcbur...@allen-heath.com <mailto:ian.mcbur...@allen-heath.com>
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