At present, it is no longer enough to produce enough products to sell or have enough personnel to meet the demand for services. The challenge of companies goes much further.

Ensuring low costs to maximize profitability is a constant challenge for companies. Therefore, guaranteeing the reliability of the electrical system is essential to meet these competitive challenges.

In order to ensure maximum reliability of electrical systems, we explain what are the main types of electrical maintenance, its advantages and disadvantages: Corrective Maintenance, Preventive Maintenance and Predictive Maintenance.

Corrective Electrical Maintenance

Corrective maintenance is based on the intervention of a device or installation in the event of a breakdown. In addition, it is the most basic and most common maintenance in small and medium businesses.

Within the corrective maintenance two varieties can be distinguished:

  • Corrective Maintenance with Fault Elimination: It consists of the repair by replacing the damaged elements.
  • Corrective Maintenance with Elimination of Causes: It not only consists in the replacement of defective elements but also in the elimination of the cause that caused the fault. This maintenance provides more durable solutions, as well as increased availability and long-term reliability. The intervention time increases, so it is usually done at scheduled stops.


Maximum use of the equipment use reserve: its useful life is known.

No high analysis capacity or technical or administrative infrastructure is required, compared to other types of maintenance.


Unpredictable interruptions in production: they can cause damage and chain failures of unknown proportions.

Risk of failure of elements of difficult acquisition with the consequent waiting time.

Low maintenance quality: due to the rush to resume production as it is an unplanned maintenance.

Reduction of the useful life of equipment and facilities.

Need for a “stock” of spare parts of considerable dimensions

Low production safety.

Preventive Electrical Maintenance

In preventive maintenance the replacement of the parts or parts of the system that could cause or suffer breakdowns is carried out with a certain periodicity, which is determined by statistical criteria.


The main advantage of preventive maintenance compared to corrective techniques lies in a significant reduction of eventual stops, obtained by introducing a certain periodicity in the observation and repair of the system.

Considerable improvement in the safety of personnel and facilities by reducing equipment failure.


Difficulty estimating correctly the frequency to perform each intervention:

If the normal operation of a system breaks down and its useful life is altered unnecessarily, its use reserve will be wasted. In addition, there could be a useless accumulation of preventive activities that increase spending and reduce availability.

If preventive programming is delayed with respect to the fault, corrective maintenance would have to replace the preventive one.