As from this month the rules for working on electrical installations have changed. I believe they are governed by local authorities Building control department. I also believe that you can do a full installation BUT you must
[a] Notify your intentions to the building control office.
[b] Have the completed works tested before use.
I think you then receive a 'passed' certificate. This cost you but I don't know who much.
What concerns me is It seems funny the mains box fuse blew yet the fuse in the shower unit didn't I thought that was what the fuse was for. Get both the shower and circuit feeding the shower tested. Sorry can't be more helpful but better safe than sorry. Submitted 23rd Jan.
Bob
bob
January 2005