On 11/04/2019 17:06, harry wrote:

So why don't they have a cable grip on the incomer(s) of a 13a socket?

Because the individual conductors are separated and the whole conductor
is gripped by the screw. With coax only the thin inner is gripped.

The consequences of an aerial cable coming loose are trivial anyway.

Not if it's in a system that's under warranty and is 200 miles away.

Bill