Standard:
JŽS S2.013
CONSTRUCTION:
Coaxial pairs
Inner conductor: Cu wire diameter of 1,2 mm cl. 1
Outer conductor: Cu tape of 0,18 x 14,4 mm
Inner diameter outer conductor: 4,4 mm
Insulation: The way of insulation between the inner and outer conductor is prescribed by manufacturer.
Steel and insulating tapes: two steel tapes
2×0,1 mm are applied hellicaly with gap.
Two insulating tapes are applied hellicaly with overlapp over the steel tapes. One of these tapes can be paper tape.
Symetrical high-frequency quads (VF)
Conductor: soft annealed copper wire of 1,2 mm class 1
Insulation: paper cord and paper tape
Low-frequency quads (NF)
Conductor: soft annealed copper wire of 0,9 mm and
1,2 mm diameter, class 1
Insulation: paper cord and paper tape
Twisting elements:
– Coaxial pairs small diameter 1,2/4,4 mm,
– Symmetrical quads diameter of 1,2 mm,
– Low-frequency star quads diameter of 0,9 mm; 1,2 mm
Cable core: concentrically stranded (see cross section)
Adjacent layers have the opposite direction of twisting.
Core wrapping: at least one layer of four paper tapes, with an overlap. It is allowed one carbonized or metallised paper tape over the last paper tape.
Inductive protection: smooth, seamless aluminium sheath, aluminum minimum purity 99,5 %
Protection from mechanical damage and corrosion: several layers above and below the two steel tapes coated with a compound. Minimum thickness is 0,5 mm for cables with diameter over aluminum sheath up to 30 mm and minimum thickness is 0,8 mm for larger diameters.
Max. gap of steel tapes is 1/3 width of the tape. The type and structure of the inner and outer protective layer can be determined by the producer provided that the armoure meets all the requirements of good protection.
Outer sheath: PVC sheath (type STKA-V), black colour (UV protection).
STKA cable has the last layer of chalk (without PVC sheath)
APPLICATION:
Railway signal and telecommunication cables designed for laying along a railway line electrified single-phase system 25 kV, 50 Hz and DC direct current system 3000 V.
