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Electric shock while using notebook computer

cause
The lead wire breaks through the insulating plate pasted on the noise suppression shield plate
and the primary and secondary sides come into contact.
 
consideration
 Safety standards have regulations regarding AC adapter drop tests and case thickness.
However, there are no clear regulations regarding strength.
It is left to the judgment of the manufacturer.
The AC adapter may be stepped on by the user or placed on top of it.
Shouldn't we have assumed a case that would be handled roughly?
important point 
 Were the material and thickness of the insulating plate attached to the shield plate appropriate?
Safety standards specify the thickness of the primary-secondary insulator.
Was the case strength appropriate?
best way
 Ribs and bosses on the case increase strength.
Change the material and thickness of the insulation plate to an appropriate one.

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