How old are solid core singles?

[davesparks]

I'm carrying out an EICR at the moment and have encountered quite a lot of solid core singles. Is there a particular time period when these were commonly in use?
I'm trying to work out a rough date for this part of installation.

 

[freddo]

I have a photo of a control panel somewhere wired in solid singles, all perfectly formed and run neatly side by side around the back plate. Certainly a work of art!

 

[Lucien Nunes]

I think the 1.5 & 2.5 conduit cables came in with metric just as solid 2.5 T+E replaced 7/.029, but whilst solid is still available the preference soon reverted to stranded. Solid has the advantage of slightly smaller O/D; we exploited this when rewiring a building with extensive use of 5/8" conduit.

Whether imperial solid PVC-insulated larger than 1/.044 was ever sold as a conduit cable I'm not sure. It was standard for panel wiring but made to a different BS.

 

[drzsta]

I've worked on 70's conduit installs with 1mm solid for lighting.

 

[john waters]

during the 80s we used stranded for conduit and solid for trunking