1. it has more mechanical strength and life
2. it occupies less space and gives better appearance
3. both 1 and 2 are correct
4.i t has high cost
Answer: 3. both 1 and 2 are correct
Explanation:
- The advantages of steel distribution poles include design flexibility, high strength, relatively light weight, long life, factory pre-drilling, reduced maintenance costs, predictability and enhanced reliability, no damage due to woodpeckers, pole rot, or fires, no catastrophic or domino effect failures.
- Steel poles possess greater mechanical strength and thus permit the use of longer spans (60 to 80 metres).
- These poles have the longer life (more than 40 years) which can further be increased by regular painting.
- These poles need protection against corrosion. Hence at the bottom (the portion which is buried underground), these poles are set in concrete muffs in order to protect them from chemical reactions.
