Types of cable installation in Electrical Network

What are the types of Cable Installations in Electrical Network?

• Underground Ducts, Aerial Cable, Direct Burial, Open-Wire

• Aerial Cable, Above-Ground Conduits, Underwater Cable, Direct Burial

• Underwater Cable, Direct Burial, Above-Ground Conduits, Open-Wire

• Open-Wire, Aerial Cable, Above-Ground Conduits, Underground Ducts

Which type of cable installation consists of uninsulated conductors mounted on poles or structures?

• Aerial Cable

• Underground Ducts

• Open-Wire

• Above-Ground Conduits

What is the main disadvantage of open-wire construction?

• High cost

• Low initial cost

• Susceptible to mechanical damage

• Requires less space

Which type of cable installation is used for replacing open wiring and provides greater safety and reliability?

• Aerial Cable

• Underground Ducts

• Above-Ground Conduits

• Direct Burial

What is the main advantage of self-supporting aerial cable over messenger-supported aerial cable?

• Provides high tensile strength

• Suitable for short distances

• Requires less space

• Can span relatively large distances

Which type of cable installation affords the highest degree of mechanical protection available in above-ground conduit systems?

• Plastic conduits

• Rigid steel conduits

• Intermediate-grade metal conduits

• Thin-wall EMT

Where are underground ducts used?

• Where space is limited

• Where mechanical protection is not required

• Where high vertical clearances are needed

• Where above-ground conductors would be unattractive

What type of cables are suitable for direct burial in the ground?

• Cables with high maintenance requirements

• Moisture-resistant, insect and rodent damage-resistant cables

• Cables with low current carrying capacity

• Cables with paper insulation

When is submarine cable used?

• When space is limited

• When mechanical protection is not required

• When no other cable system can be used

• When high vertical clearances are needed

Why must the shields and metallic sheaths of power cables be grounded?

• To improve the mechanical protection

• To prevent hazards and rapid degradation

• To reduce the maintenance costs

• To increase the current carrying capacity