Hi Doug:
See IEC 61010, 3rd edition, Clause 7.4 d) and e).
The 4X load is only applied to the support or castor that has the
greatest load (independent of the equipment) (d). I guess the pass
criterion is no failure of the support or castor. (If the support or
castor is rated 4X or more of its load, then no test is necessary.)
The maximum load support or castor is removed; the equipment shall not
overbalance (but without the 4X load) (e). (Hmm. If the support or
castor meets (d), then what is the value of assuming its failure?)
The inspector has not written the two requirements correctly.
Best regards,
Rich
On 7/22/2019 5:11 PM, 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 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
[email protected]
https://www.linkedin.com/in/dougp01
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