Both XLPE insulated cable and PVC insulated cable will be subject to a variety of external mechanical forces when laying.
Like Bending, stretching, torsion, positive pressure, impact, and vibration, etc. All that forces will do some harm to power cables. Then that comes armored power cable.
There are two kinds of power cable armoring, SWA(steel wire armored) power cable and STA (steel tape armored)power cable.
In order to make the Insulated Power cables can bear radial pressure, then use double steel tape lapping with butt gap, called power cable STA.
There are LV STA power cables, MV STA power cables, having the construction as 0.6/1KV STA power cable,3.8/6.6kV Cu/XLPE/STA/PVC Cable,12/20kV Cu/XLPE/PVC/STA/PVC Cable, etc.
The STA power cable is generally used in places bearing large pressure as crossing roads, squares and sides of roads, and railways that are of great shake. It is suitable for burial, through tunnels and pipes.
And to have power cables bear large axial tensile force, we use multiple low carbon steel wires around insulated cores, thus is SWA Power cable.
There is also 0.6/1KV SWA power cable,XLPE/PVC/SWA/PVC Cable,12.7/22kV XLPE/CTS/PVC/SWA/PVC Cable,19/33kV AL/XLPE/SWA/PVC Cable. Generally used in place with a large span or big laying gap.
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