Companies performing work related to electrical installations have an obligation to be registered into Elvirksomhetsregisteret (the Norwegian register of enterprises that design, install and maintain electrical installations and electrical equipment). In advance, the foreign enterprises must be registered into Brønnøysundregisterene (the Norwegian Register of Business Enterprises) to get a Norwegian organization number. Norwegian certificate. The company cannot perform work in Norway related to electrical installations or electrical equipment before the enterprise is registered into Elvirksomhetsregisteret and has received a confirmation from the Norwegian authorities.