During Chapter 14, you will have to turn on a generator. Next to the generator is a panel where you can solve a circuit diagram. You have to put all three pieces in the right position to power up all electrical equipment simultaneously. You cannot leave the panel in between. If you only power up two parts and then do the third one separately, it will not count. Once everything is correctly in place, exit out of the panel to get the "Entry Level Electrician" trophy.