The new IEC 62368-1 ed 3.0 has a somewhat cryptic way of defining 3 alternate (supposed equivalent) tests for this:
* The equipment is tilted in all directions such that the base of the equipment is at an angle up to and including 10°; *or* * The equipment is placed on a plane at an angle of 10° from the horizontal and rotated slowly through an angle of 360° about its normal vertical axis; *or* * The equipment is placed on a horizontal non-skid surface and subjected to a force equal to: - 50 % of the weight of the unit vertical downwards, but not more than 100 N. If, during the test, the supporting surface prevents the equipment from overturning, the test shall be repeated such that the supporting surface is not used to pass the test; and - 13 % of the weight in all horizontal directions but not more than 250 N, that is applied to the worst case positions on the equipment by means of a suitable test apparatus having a flat surface of approximately 125 mm by 200 mm, in such a way as to produce the maximum overturning moment. The test may be applied at any height not exceeding 1,5 m from the base of the equipment. The test force shall be discontinued if the equipment remains stable after being tilted 10° from vertical.The normal vertical axis in the second alternate test to be understood as the axis that was vertical before tilting; one may be tempted to rotate the full set up over a vertical axis,which does not provide the same result.
Sidenote for the EN-version to become harmonised (cited):Standards specifying alternative tests will need to provide guidance for application, fully open manufacturer alternate tests are a _legal problem for citation of a standard in the EU_. Either a proof of equivalence of alternate tests needs to be provided, or the conditions on which alternates to be selected shall accompany the standards tests. If your product needs to be used for the EU-market in the years to come, make sure you comply with all alternates.
Gert Gremmen On 12-6-2019 6:55, frankt_cpmt wrote:
Thank you for sharing your experience Ted. Sent via the Samsung Galaxy S8, an AT&T 5G Evolution capable smartphone -------- Original message -------- From: Ted Eckert <000007cf6ebeab9d-dmarc-requ...@ieee.org> Date: 6/11/19 21:03 (GMT-08:00) To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: Re: [PSES] Tilt test Let me address the question of “how to safely perform this test”.The proper safety precautions depend on the mass and stability of the equipment. Equipment doesn’t have to be too heavy to cause an injury if it falls over on somebody. If the equipment is large and/or very heavy, consider having it tested at a laboratory that has equipment that can do the test safely. If you don’t have that option, think about what precautions may be required.I can give an example of a test I ran at a previous employer. I had to run a 10-degree tilt test on a standard sized equipment rack loaded to 1500 kg. The stabilization feet were down, but they were only about 500 mm apart between the two sides of the rack. The rack was a full 2-meter height with the load evenly placed in the rack. This should have been done at an external laboratory with the proper equipment. However, an NRTL was there to witness testing and they insisted in seeing it done that day.The first mistake was figuring out how to tilt the rack. The solution was to go to the parking lot and to get the jack out of the back of a car. The jack was designed to lift one wheel of a 1500 kg car, not half of a 1500 kg rack. Somehow, the jack survived the test and tilted the rack.The second mistake was the placement of the test. The rack was about 1 meter from a wall and we tilted it towards that wall. It was standard drywall construction, and I don’t think it would have stopped the rack if it fell over. The people in the office on the other side would have been in for a surprise.The next mistake was not placing any limitation on the tilt. We could have placed straps at the top of the rack to a solid support in the lab. We could have limited the tilt to 11 degrees, so that if the rack did start to go over, it would have been stopped before it went too far. This probably would have also required blocking the stabilization feet to keep them from sliding.There was an additional error of not properly securing all loads inside the rack. The full loading of the rack was simulated using steel plates, but they were just held in place by gravity. When the tilt reached 8 degrees, much of the weight shifted. We were tilting the rack towards its front, and only the latch on the front door kept the plates from sliding out of the rack.The test was completed without incident, and that was largely due to the mechanical engineers designing the product to pass the test. There were still plenty of opportunities for things to go wrong. The NRTL engineer left the facility happy with the results. Only after that did I realize how poorly designed the test setup was.In summary, think about the worst possible things that could happen during your test. Figure out ways to design them out of your test setup. If you can’t eliminate a risk, consider taking the product to a facility that can run the test more safely. If you are not sure what the hazards may be, consult with your facilities Employee Health and Safety (EH&S) staff.Ted Eckert Microsoft CorporationThe opinions expressed do not necessarily reflect those of my current or former employers./This email message may contain confidential and privileged information. Any unauthorized use is prohibited. If you are not the intended recipient, please contact the sender by reply email and destroy all copies of the original message.///*From:* Frank Tang <00000d3fa4ae712a-dmarc-requ...@ieee.org> *Sent:* Tuesday, June 11, 2019 1:18 PM *To:* EMC-PSTC@LISTSERV.IEEE.ORG *Subject:* [PSES] Tilt test Hi Engineering community,I'm trying to find information regard tilt testing, such as minimal tilt angle based on system weight, how to safely perform this test, etc; can someone direct me to site(s) or standards I can reference?Google for once isn't helping. -- Thank you and best regards. - Frank - ----------------------------------------------------------------This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. 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-- Independent Expert on CE marking Harmonised Standards (HAS-) Consultant @ European Commission for RED and EMC EMC Consultant Electrical Safety Consultant - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <emc-p...@ieee.org> All emc-pstc postings are archived and searchable on the web at: http://www.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. Website: http://www.ieee-pses.org/ Instructions: http://www.ieee-pses.org/list.html (including how to unsubscribe) List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <sdoug...@ieee.org> Mike Cantwell <mcantw...@ieee.org> For policy questions, send mail to: Jim Bacher: <j.bac...@ieee.org> David Heald: <dhe...@gmail.com>
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