Safer Initiation with Electric Detonators in Case of Earth Fault. This work has been carried out to investigate the risk for misfires due to insulation faults, "earth faults", in blasting rounds. More severe requirements are recommended for the insulation resistance value. Furthermore a method to carry out insulation measurements and testing of the round in order to achieve safer initiations is explained. This method and the requirements mentioned above are based on both theoretical and practical studies.