With the naked eye you can see that for this work you will need steel nerves. And also – a high-class pilot, windless weather and impeccable observance of the rules of electrical safety.
The costume of the technician is 75% of the Nomex refractory material. The remaining 25% fall on stainless steel threads, which ultimately creates a Faraday cage around the person.
Most likely, for most of us, all knowledge of electricity from the course of school and university physics will not be useful. However, if you are going to do in the future to check the high-voltage power lines from the helicopter – without this knowledge is indispensable.