Over 14+ years of experience with CompEx certificate of Core Competence-JTL-UK and having experience in installation, inspection, pre-commissioning & Commissioning, start-up overrides prior to start-up, Completion/Certification/Turnover works of Electrical, Instrumentation and Telecom as involved.
After 5 years of working as EEHA (Electrical equipment in hazardous areas) inspector, I can definitely say the Ex knowledge not only mandatory as a type of quality assurance, it is also vital for preventing future breakdowns and catastrophic failures
As an EX advisor you see many firms. You learn that all firms are special, persons are too. Therefore, all the works required to maintain a safe working environment must be designed to fit each single firm. By doing that you're not only creating a safe workplace; you are changing the safety culture!