SAFE ISOLATION, ELECTRICAL SAFETY & ELECTRICAL CONCEPTS The Essential Electrics course is for engineers who need to work on electrical systems, but may not have any formal qualifications to do so. Essential Electrics is the perfect course for engineers who need to comply with the Electricity at Work Act of 1989. The Essential Electrics course covers the safe isolation of equipment, using test equipment and testing repairs prior to energising. Candidates will need to demonstrate that they can undertake simple wiring tasks such as safe isolations, basic wiring and testing repairs.