In another case, Massey man Jack Camplin did electrical work on a 36 foot yacht in 2014.
While he had indicated he was qualified to do this marine work, Camplin was not a registered electrician and not authorised to do it, MBIE said.
MBIE said Camplin's work was non-compliant and safety issues were found.
Camplin, MBIE said, admitted one charge of performing unauthorised prescribed electrical work and was fined $6075 and ordered to pay costs of $356.
"For safety reasons, only licensed electrical workers are allowed to perform prescribed electrical work," Registrar of the Electrical Workers Registration Board Richard Stubbings said.
"In both of these cases, the men involved implied that they were qualified to do the electrical work they were engaged to complete, however that was not the case. This misrepresentation of their qualifications resulted in dangerous and deficient work, which could have resulted in a serious incident," he said.
"This highlights the importance of always using a licensed electrical worker to do prescribed electrical work. To ensure the person is licensed, ask to see their photo ID before they begin the job, and ask them to certify their completed work," Stubbings said.