Any electrical work 230v carried out on a transportable structure including upgrades and conversions must all be carried out by a qualified electrical person, who will supply you with a Certificate of Compliance or an Electrical Safety Certification. Any work done must be done to AS/NZS 3000 and AS/NZS 3001.The Warrant of Electrical fitness (Ewof) must be carried by an electrical inspector. Ewof's are issued and renewed every 4 years. Renewing a EWOF is a check and test to ensure everything is safe.