The type of certification depends on the type and extent of installation work you have had carried out in your home. There are electrical certifications for alterations, additions and new installations.
EICs (Electrical Installation Certificates) and MEIWCs (Minor Electrical Installation Work Certificates provide the person responsible for the electrical installation safety with a declaration that the alteration, addition or new installation is safe to be used when it was put into service.
These certificates provide a basic foundation if any further inspection or testing is required in the future. Presenting these certificates can save on potentially costly exploratory work that could be needed in the future.
The certificates also provide documentary evidence in the event of a claim that a fire or injury was caused by your electrical installation that show that the installation was completed to a satisfactory safety standard.
So, it is essential to keep your certificates in case of any insurance claim.