Apart from safety, maintenance is needed to keep plant in an acceptable condition. Maintenance of this kind must be reviewed on an economic and energy efficiency basis.While it is appreciated that breakdowns of plants may result in costly interruption of normal building operations, it must also be borne in mind that stopping the plant for maintenance can also cause a loss in production.Equipment on continuous and arduous duty, e.g. switchboard, motor control centers (MCCs), air-handling units, chiller plant etc., require more attention than that which is lightly loaded and rarely used. Every aspect is to be closely monitored for human safety and subsequent maintenance is the need of hour.