I would have thought that a polite request for information would be less
likely to damage relations than a challenge to the ruling.
Best wishes
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2019-07-23 06:34, Doug Powell wrote:
It may be possible except my client is the producer selling the
product on wheels. The inspector is certifying the end product of
which this device is only a large component. I really don't want to
challenge them straight away and possibly sour the relations between
my client and their customer. In any case, I'm beginning to suspect
this may be an internally circulated technical information letter or
engineering judgement at the agency. There are three other
observations I need to deal with and we should be done. This stability
requirement is the one that seems just a bit weird.
Tis a complicated world we live in, eh?
Thanks, Doug
*From:* j...@woodjohn.uk
*Sent:* July 22, 2019 11:05 PM
*To:* doug...@gmail.com; EMC-PSTC@LISTSERV.IEEE.ORG
*Subject:* Re: [PSES] UL 61010-1 7.4 stabilty
Is it possible to ask the inspector to give publication and clause
references to the claimed provisions?
Best wishes
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associateswww.woodjohn.uk
Rayleigh, Essex UK
On 2019-07-23 01:11, Doug Powell wrote:
An interesting requirement came up today on a system that uses wheels
for mobility. The inspector says clause 7.4 requires "... the unit be
stable in the upright orientation, with wheels augmented with
floor-braces or other such parts as necessary such that each wheel or
brace can withstand four times the weight normally applied to it and
the unit will remain stable and upright if any wheel or support is
removed or broken." This is the exact wording in the letter report.
I have no problem with stability requirements but I checked the third
edition of UL 61010-1 and the national differences. I found nothing
like this statement in the standard. It didn't even mention the
words wheels or castors. I am familiar with the four times
requirements for handles, lifting rings and the like but not for
wheels in particular. Also, I do know about various topple tests and
the like are performed but a broken wheel or broken support test?
This made me wonder if the certifying agency has internal
requirements or possibly the inspector is confusing wheel
requirements from IEC 60601-1 for "transportable equipment" .
Does anyone know where the above may have originated?
Thanks everyone!
Doug
--
Douglas E Powell
doug...@gmail.com
https://www.linkedin.com/in/dougp01
Currently out of the office and working from my Android phone
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