Electrical drawings are one of the most important tools for an Electro-Technical Officer (ETO). In many ways, they are the language of electrical engineers on board ships. Without understanding drawings, it is difficult to fully understand how a system works or how to solve problems when faults happen.

When we study a system, electrical diagrams help us understand the operating sequence, control logic, protections, and connections between components. During troubleshooting, drawings show us where signals come from, where power flows, and which parts should be checked first. This is why reading drawings is not only for study — it is a very important practical skill for every ETO.

Before some junior engineers join their first ship, I always encourage them to read makers’ manuals and electrical drawings. However, many people think there is no need because they are not joining that type of ship yet. Some also believe that if they already know basic electrical theory, they do not need more practice reading drawings.

In reality, reading drawings is not difficult. The difficult part comes during real troubleshooting situations. When equipment suddenly fails and there is time pressure from operations, engineers may not have enough time to slowly study a drawing for the first time. In those moments, experience and familiarity become very important. Engineers who already know the layout of the drawings can quickly find the important sections and identify possible causes of faults.

This is why regular study is important. The more we read drawings, the more familiar we become with common circuit designs, control systems, and troubleshooting methods. Over time, we start to understand the logic behind the systems instead of only memorizing circuits.

On board ships, there are many different drawings available. For ETOs, I believe it is best to first focus on important systems such as propulsion, power generation, and cargo handling systems. These systems are critical for ship operation and usually require fast troubleshooting when problems occur.

At the beginning, studying drawings can take a lot of time and effort. But after working with more ships and more systems, engineers will notice that many designs are similar. Experience makes learning easier and faster.

Sometimes ships may not have complete drawings. In such cases, the best solution is to request them from the office. However, in reality, it is not always easy to get documents quickly. Some drawings may already exist inside manuals, but engineers may not know where to find them. This is another reason why regular study and familiarity with manuals are important.

Engineers who have spent time reading many drawings usually develop a better understanding of circuit design and system logic. Because of this, even when drawings are missing, they can still trace wiring, understand control sequences, and solve problems more effectively.

For an ETO, studying electrical drawings is not only preparation for exams or interviews. It is preparation for real situations on board, where quick understanding and correct troubleshooting can save time, reduce downtime, and improve safety.