When most people find issues with their electrical system, they call a professional electrician. Families and individuals need to ensure that they are safe in their home. It makes sense for them to hire you, but it also means that you have to ensure that the work you do is correct. Countries like Australia require you to have a Certificate of Compliance for electrical work that you perform. That way, if anything happens later, you have proof that you tested the equipment or installation setup and the work that you did was up to standards.