On Monday, 12 October 2020 at 11:26:10 UTC+1, Jack Harry Teesdale wrote:
On 12/10/2020 10:13, JohnP wrote:
Looking down a hole - as I do - there are some modifications being done to
cables at a nearby substation. Some of the old cables are being extended
with "twisted three" cables rather than the usual three phases in a
circular outer.

Any ideas why?

It's cheaper.
I saw that when they dug a trench through a local garden centre car park to get to a substation and was intrigued. No idea if it is plaited already on the drum as I never saw that but it looked too neat and regular to have been done on site.

Richard