Installationsvirksomhed Installationsentreprenørvirksomhed (uden specialisering) Installation af gas, vand og sanitet
Installation (fittings and fixtures) 503.1 General installation work 503.2 Gas fitting and plumbing, and the installation of sanitary equipment 503.3 Installation of heating and ventilating apparatus (central heat ing, air conditioning, ventilation) 503.4 Sound and heat insulation, insulation against vibration 503.5 Electrical fittings 503.6 Installation of aerials, lightning conductors, telephones, etc.