However, the current practice of allowing the transients to spread over the grounding system produce 'dirty grounds' and this in turn cause many EMC problems. More research is required to develop the concept of ground as an absorber of transients. Risk analysis Risk analysis in terms of the effects of transients in typical facilities are to be performed. The risk level depend on the nature of transients, the effects of transients on the facility, and the level of tolerance in the functional deterioration of the facility. The risk analysis may even has to be carried out on sub-units of a facility such as communication room, medical ward, control room etc.
Lightning is an important cause for transients in power and communication distribution network.
Sweden and most countries of Western Europe are covered by lightning location systems. The archived lightning data could be used in the risk analysis of distribution systems and customer facilities at different geographical locations. The possibility of using real-time lightning data in initiating appropriate emergency control has to be explored. All these services have their own installation practices which may not be the best from the point of view of transient control. More work is required to see how the design and installation of various services can be co-ordinated with the aim of efficient control of transients.