12.6 The base and cover of non-rewirable plugs shall be permanently attached to each other, such that the flexible cord cannot be separated without making the plug permanently useless, and the plug cannot be opened by hand or by using a general purpose tool, for example a screwdriver used as such. A plug shall be considered to be permanently useless when, for reassembling, the plug parts or materials other than the original have to be used.
The base and cover of rewirable plugs shall be firmly secured to each other. It shall not be possible to remove the cover unless the plug is completely withdrawn from the socket-outlet. Any fixing screws shall be captive.
After the test it shall not be possible to touch live parts with the test pin shown in Figure 1 applied with a force of 5+0/-1N.