The pole on the left is electric board pole (240v)
The main cable from top left to the pole is the main cable
All the smaller cables branching to the houses are service cables.
All are insulated and carry 240v.
The service cable as you can see goes from the pole (look at first house to the left) to the house (in between the 2 windows) and travels inside the house into the cutout (meter box).
If i was cleaning that house I would go from one top window to the next with the water running.
For the split second the water touches the insulated cable it isn't going to fry you
The cable is called ABC (Aerial Bunched Conductor) or at least it was. Service cable (new at least) is insulated too. There should be no exposed part of wire in these type services until it reaches the cutout.
If any of you see older green looking wire (copper) or ally (dull looking) then this is not insulated
These tend to be on the mains not the services.
Darren
Ex High Voltage Fitter