IEC 60512-16-2:2008 details a standard test method to assess the effectiveness of the means by which an oversize male contact, or other similar object, is prevented from entering the equivalent female contact.
IEC 60512-16-2 Ed. 1.0 b:2008
$12.00
Connectors for electronic equipment – Tests and measurements – Part 16-2: Mechanical tests on contacts and terminations – Test 16b: Restricted entry