Electrical Equipment

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just im asking about maintenance purpose.. like we are using bulbs.. in using time any fluctuation will happen to decrease the bulb life time.. and cable strength and cb breaking level or elcb breaking level... when bulb switch operate more time what happened ?actually incandescent lamp life time like 1000hrs...how to decrease real life to actual life time(any variations)....how to estimate that.. In a transmission line any require to change.. how develop the maitanace field of electrical engineering..

Where have you looked for the answers, so far?

The questions you asked are those of a student who has not done their homework.

They are far too broad to be answered here on the forum.

Read a book. Do some independent research!!

Read this:

• Look for answers before you post. Search CR4 or use a search engine to see if you can find the answer to your question.
• Provide as much information as possible. The more details you provide, the better the chance that someone on the site will be able to help you find an answer.