Going somewhat off the original topic but I noticed this in the Wikipedia entry:

Quote
Industrial, heavy commercial and stage/studio installations use European standard IS EN 60309:1999 / IEC 60309 plugs and sockets. BS546 was once commonly used for stage and studio lighting, however it is no longer permitted for safety reasons and should not be installed


BS546 is still commonly used in theatre applications here. What possible safety reasons are there so long as the circuits feeding them are properly protected?

Using BS4343/IEC309 for all stage lighting connections seems horrendously cumbersome given their bulk.