Training to identify root causes of electrical faults is a standard, logical process of elimination normally carried out by a fully trained electrician and the vital importance of thinking about safety first, by checking every wire to see if it is live before touching it, and wearing rubber-soled boots to avoid electrocution.
Electrician training courses at a fully approved training centre emphasise time and again the correct working procedures and methods which are always accompanied by observation of both mandatory Health and Safety and Building Regulation rulings and instructions. Adhering strictly to the rules when working with any electrical repair, no matter how minor will prevent a serious or fatal injury!
There are three steps to electrical troubleshooting: identify the problem, localize the issue, and repair it. All three steps can be applied to any electrical problem.