On 25/02/15 17:54, Tough Guy no. 1265 wrote:

I haven't seen concentric cable for forty years.
It WAS a dead loss.

My house is supplied with it, including the cable they recently replaced.


So's mine - 2 core (live centre and neutral outer) on a TN-C-S system.

There is a 3 conductor version for TN-S systems too.