PM 05

What is the purpose of night inspections for overhead power transmission lines?

• To visually check the condition of overhead line elements

• To assess the quality of work of electricians

• To measure the insulation resistance of insulators

• To perform emergency measures after accidents

How often are day inspections, the main type of inspections, carried out for overhead power transmission lines?

• Weekly

• Monthly

• Biannually

• Annually

What is the minimum horizontal distance required for the security zone of overhead lines up to 20 kV?

• 1 meter

• 2 meters

• 5 meters

• 10 meters

During maintenance, what is the main means of combating wood damage for wooden supports?

• Tapping the support in dry weather

• Applying antiseptics to the support material

• Installing repair couplings

• Measuring rotting depth with a megohmmeter

What is the primary disadvantage of wooden supports for overhead power transmission lines?

• Corrosion

• Melting

• Rotting

• Cracking

How is the condition of wooden supports assessed during dry and frost-free weather?

• By measuring insulation resistance

• By tapping to establish rotting of the core

• Performing night inspections

• Checking with binoculars

What is the minimum distance required from overhead lines to the ground according to the Rules of electrical installations?

• 2 meters

• 5 meters

• 6 meters

• 7 meters

What percentage of overhead line damage is attributed to insulator failures according to the text?

• 10%

• 20%

• 30%

• 40%

How is the rotting depth of wooden supports determined?

• By visual inspection

• By measuring with a megohmmeter

• By piercing the support with fixation of force

• By night inspections

What is the primary purpose of repair couplings in the context of overhead power transmission lines?

• To restore mechanical strength of wires

• To measure insulation resistance

• To check the condition of insulators

• To prevent short circuits to the ground