Hi there Trimix,
Welcome to the group!. [Linked Image]
This looks really bad IMO, a live 400+V cable with no protection and it also looks like there is nothing holding those cable joints together apart from the twists of the copper strands of the wires.
What I can't work out, is why there is a mid-span joint in the run between posts?.
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4mm? yeah, right!!! If memory serves me correctly it is about 25 or 35mm may even be 50mm! I aint getting hold of it to check though!!! NOTE the lack of fuses as well!
Street-lighting conductors here in NZ measure anything from 10mm up to 35mm copper, above that Aluminium conductors would be used.
Regarding the fusing, a lot of street-lighting circuits I've come across aren't actually fused at each pole, there may be a fuse up at the actual fitting itself, but the distribution side of the circuit is usually only fused at the originating end (or in some cases, the circuit may be one large ring-circuit).
Has anyone been notified of this shambles?.
Regardless of who did this in the first place, this constitutes a real public safety hazard!. [Linked Image]

[This message has been edited by Trumpy (edited 02-09-2007).]