Arrange for wiring to be tested at least once every 5 years and always use a NICEIC-registered electrician to carry out electrical repairs.
Trefnwch fod gwifrau yn cael eu profi o leiaf unwaith bob pum mlynedd a defnyddiwch drydanwr wedi'i gofrestru â NICEIC i wneud unrhyw atgyweiriadau trydanol.