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For IEC 62368-1:2018 (3rd Ed.), Cl. 8.6.5, why was the horizontal force test value increased to 20% of the equipment weight, or max 250N, from IEC 62368-1:2014'™s (2nd Ed) values of 13% and 100N, respectively?

This horizontal force test applies to constructions with controls or a display and is intended to simulate the force of a child who might climb onto the equipment and engage front-mounted user controls or the moving images on the display.  The original horizontal test force applied was 13% of the equipment mass or 100 N, whichever was less, applied to both MS2 and MS3 constructions and was developed to address many field incidents of CRT TVs / monitors in the late 20th century; the details of which are noted in 8.6.5 of '˜the rationale document,'™ IEC TR 62368-2. However, more recently, flat panel display TVs / monitors have higher inherent instability in their design, especially if a child were to lean on the edges or controls, and such flat panel display products also are increasing in size/weight. Therefore, IEC TC108 revisited the 8.6.5 requirements, and in IEC 62368-1:2018, the force was increased to either 20% of equipment mass or 250 N, whichever is less, to anticipate better today'™s larger flat display units considered MS3 (but MS3 only). Please note, for applicable products considered MS2, in IEC 62368-1:2018, the Horizontal Force Stability (8.6.5) requirement has been replaced by Static Stability (  Also, for applicable products considered MS3, the external horizontal force test remains only one option in 8.6.5, with two variations of the 15-degree tilt test available as alternate performance options.

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