This guide is intended to give background information to technical committees when dealing with safety requirements for products intended to be integrated in a home control system. This guide includes information on functional safety as well as conventional safety aspects relevant to home control systems. This guide defines the safety-related characteristics of systems intended for signal transmission through building wiring carrying low voltage or extra low-voltage@ through fibre optics@ through air or by means of electromagnetic waves in household and similar premises (home control systems). The guide is based on the definition of home control system as chosen by ISO/IEC JTC 1/SC 25/WG 1. This definition limits the scope to single family dwellings and business premises of similar complexity. The EMC aspects have not been covered@ since these are dealt with by TC 77.