[quote]What does HT, LT and TSP exactly mean?[/qoute]
HT High Tension, usually 11000 Volts.
LT Low Tension, 230 / 400 Volts.
TPS Tough plasic sheethed. That's the white cable used in wiring up houses, in this case 3 core: Red, Ø. Black, N. Green, Earth. ( not supposed to be used for streetlights unless in conduit.)
For streetlights nowadays 6 or 10mm² Cu Neutral screened cable is used. Previously 4 mm² single core with single thick or double layers of insulation was used.
I make you a close up photo.