Re: When were ring mains introduced in domestic housing?
I remember those conversion-frames for instaling a 2-way 13A socket where there was originally just a single-outlet.
There were similar frames available to transition between the old 1950s/60s pattress-boxes with the fixing screws vertical and newer sockets with the fixing-screws horizontal - so removing the need to chisel-out the old pattress, instal a new one - then replaster and redecorate!
All the 13A outlets in my parents' house were unswitched. The only socket-with-a-switch was the round-pin 15A one on the cooker-control (which also had natty red neons to show when the cooker or socket were switched on).
When did switched-sockets become the norm?
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