Question
Download Solution PDFWhich of the following protects a cable against mechanical injury?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFLead sheath:
- In order to protect the cable from moisture, gases or other damaging liquids (acids or alkalis) in the soil and atmosphere, a metallic sheath of lead or aluminium is provided over the insulation as shown in figure.
- It has a minimum dielectric stress in a cable.
Bedding:
- Over the metallic sheath is applied a layer of bedding which consists of fibrous material like jute or hessian tape.
- It is to protect the metallic sheath against corrosion and from mechanical injury due to armouring.
Armouring:
- Over the bedding, armouring is provided which consist of one or two layers of galvanized steel wire or steel tape.
- Its purpose is to protect the cable from mechanical injuries while laying it or handling it.
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