Construction of Belted cables

Classification of Cables according to their Construction:

Electrical cable classification can be done on the basis of their construction as under:

• Belted cables — up to 22 kV
• Screened cables — from 22 kV to 66 kV
• Pressure cables — beyond 66 kV

Belted cables

• These cables are used up to 22 kV.
• The cores are not circular in this case. The cores are insulated from each other by use of Impregnated paper.
• The three cores are grouped together and belted with the help of a impregnated paper belt.
• The belted type cables are suitable only for low and medium voltages.
• The gaps between insulated cores and belts are filled with fibrous material (like jute etc.). so as to give circular cross section to the cable.
• The paper belt is covered with lead sheath to protect cable from ingress of moisture. The lead sheath also gives mechanical strength to the cable.
• The lead sheath is finally covered with one or more layer of armouring and outer serving.

• Under Ground Cables
• Single Core Under Ground cable