No, these are not allowed here since it lets you put a grounded appliance without being connected to the ground.
I can't see for sure but it looks like your plug will not fit in a grounded socket here.
Why then 45°. Why not 90°? Like this one:
[Linked Image from catalog.geindustrial.com]

[This message has been edited by Belgian (edited 11-03-2002).]