Recently I found this plastic thing on a pillar in the village:
Looks like it is not finally connected yet, just attached with tape to the pillar.
What is it's purpose?
4 cables go down to this thing:
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This is a fiber optic splicebox. It is a weatherproof enclosure where two (or more) ends of fiber optic cables are connected.
Yes - electricity poles also carry optical fiber for control of the network and often internet access.
It's a junction box for fiber optic cables.
We've given your photo to the forensics lab and they suspect that it is a fibre-optic data cable using the electrical power distribution poles as the cable route.
Photo 1. The enhanced image.
Photo 2. A fibre-optic junction box. Source.
The optical fibres can be run with power cables as they are insulating and there is no danger of fault currents going to ground.