1. give better mechanical strength and provide insulating property
2. require no maintenance
3. are strong and have a long life
4. all of these
Answer: 4. all of these
Explanation:
- RCC (Reinforced Cement Concrete) and PCC (Pre-stressed Cement Concrete) poles are commonly used for medium transmission lines because they have several advantages over other types of poles.
- One advantage of RCC and PCC poles is that they are very strong and durable, and can withstand extreme weather conditions, such as strong winds and heavy snowfall. This makes them ideal for use in areas where the transmission line needs to be protected from these types of environmental hazards.
- Another advantage of RCC and PCC poles is that they are relatively easy to manufacture and install, which makes them cost-effective compared to other types of poles. They also have a long service life, which means that they do not need to be replaced as frequently as other types of poles.
- In summary, RCC and PCC poles are commonly used for medium transmission lines because they are strong, durable, cost-effective, and have a long service life.
- Reinforced concrete poles have become very popular as line supports in recent years.
- They have greater mechanical strength, longer life, and permit longer spans than steel poles.
- Moreover, they give a good outlook, require little maintenance, and have good insulating properties.
- The maximum permissible span for RCC poles is 80 - 100 meters.
- The main difficulty with the use of these types of electric poles is the high cost of transport owing to their heavyweight
- Therefore, such poles are often manufactured at the site in order to avoid the heavy cost of transportation
