Not too sure what an ACA is. When you say approved Electrician, approved by who or what? In any event, normally level 3 installation I&T is the start point. To do EICR's a 2391/2 is useful if seeking employment of registration with a scheme. Though strictyl speaking not necessary legally or regs wise, just.... Regs do speak of competence seen as experience and education which infers exam passes. The reason for the 2391 is to become recognised as able to do EICR 's Certainly schemes (CPS) will require it. I imagine employers would also require it. However if you have just passed exams and have no real exeperience on the job it is doubtful the 2391 would carry a lot of currency in either scenario. In order to get insured for indemnity (required for condition reports) you would need to demonstrate experience. There is no doubt the acquiry of 2391 is of value going forward in any work environment.