Various components which constitute the entire electrical installations wear out or deteriorate due to either inherent or external causes. Such components will not perform as they did in healthy condition. These defects can be detected at an earlier stage and the components can be replaced.
This will help to avoid future breakdown of the system as breakdown maintenance is not only time consuming but it also causes revenue losses.
To prevent these undesired circumstances to happen, it is necessary to carry out preventive maintenance of the electrical installations with all steps to be taken to preserve the components from deteriorating and enable it to give sufficient service with reasonable operating efficiency upto the full expected life.