In nowadays industrial facilities robots play a major part in assisting the human worker. To ensure an effective process not only safety aspects have to be considered. For increasing the acceptance of humans towards robots, social aspects are important as well. In this paper we examine how the behaviour of humans towards other humans can be adapted to the robots behaviour. Especially, the usage of social rules regarding the distance between people are studied with different robot characteristics for height, velocity and emotional expressions as well as human factors.