I've just come across a 50-ish-year old ring circuit where one cable at the CU is the usual 7/0.029" red/unsheathed/black Imperial T&E cable, but the other cable is red/transparent/blue, all three conductors (apparently) 7/0.029". I've never seen this cable type before - is anyone familiar with it, and if so, what's its story?
Sounds like the old three phase colours, red, white, and blue. Probably polythene insulation which is partially transparent resulting in the "white" core being more or less transparent.
Often used for 2 way lighting circuits. Came in both 3 core and in 3 core with earth, and of course twin and twin with earth. If compared to PVC, polythene insulation feels greasy and looks partially transparent. The copper of the red core can often be seen through the insulation.
;Polythene insulation enjoyed a brief period of popularity between the end of rubber insulation, and the general use of PVC.
The flat owned by my late grandmother and built in the mid 1960s used a mixture of polythene insulated cables and PVC types.
Sounds like the old three phase colours, red, white, and blue. Probably polythene insulation which is partially transparent resulting in the "white" core being more or less transparent.
Often used for 2 way lighting circuits. Came in both 3 core and in 3 core with earth, and of course twin and twin with earth. If compared to PVC, polythene insulation feels greasy and looks partially transparent. The copper of the red core can often be seen through the insulation.
;Polythene insulation enjoyed a brief period of popularity between the end of rubber insulation, and the general use of PVC.
The flat owned by my late grandmother and built in the mid 1960s used a mixture of polythene insulated cables and PVC types.
