I'm trying to guestimate how long ago the consumer unit at my daughter's house was installed. It's a Crabtree Starbreaker (which if course is a brand/model that has been around and changed a lot over the years), it just has a 100A main switch and MCBs, no RCDs at all.
It's obviously been installed as an upgrade to an old installation. Would it have to conform to current regulations at the time or could the installer have got away with conforming to the original regs?
Anyway, when was protection of socket circuits with RCDs brought in?