Before we jump into our practical scenario, we need to cover the most important part of an Electrical Technician's role...
Have a watch of the video below, where Daniel talks about how he factors in safety when working as an Electrical Technician. Take some notes on the key safety measures mentioned, both for electrical hazards and road users/trains/other on-site hazards.
The basic ABCs for electrical work are:
A - Assume nothing
Never assume a circuit is not live
B - Believe no-one
Do not go off anyone’s word that something is not energised
C - Check everything
Test before you touch: use a voltmeter to check that the equipment you’re working on is not energised
Confirm your testing equipment is functioning correctly before and after proving your isolation