1. A method of identifying at least one event zone subject to an event in a busbar system comprising a plurality of feeders and a plurality of intelligent electronic devices monitoring at least some of the feeders, wherein the method comprises: receiving first event related data from the intelligent electronic devices, and determining whether the at least one event zone subject to the event is a primary monitoring zone of at least one of the intelligent electronic devices or a non-primary monitoring zone for all of the intelligent electronic devices, a primary monitoring zone of an intelligent electronic device being a monitoring zone which that intelligent electronic device is assigned to monitor, a non-primary monitoring zone being either an event zone having a power level which differs from the power level monitored by the intelligent electronic devices or an adjacent monitoring zone to all of the electronic intelligent devices, wherein the determining comprises determining a conditional probability that the first event related data is a result of the event having occurred in an adjacent monitoring zone of all intelligent electronic devices, conditional probabilities for each intelligent electronic device that the first event related data is a result of the event having occurred in the primary monitoring zone of one of the intelligent electronic devices, conditional probabilities that the first event related data is a result of the event having occurred in a primary monitoring zone of more than one intelligent electronic device, each determined conditional probability thereby being associated with at least one event zone, determining whether the event occurred in at least one primary monitoring zone or in a non-primary monitoring zone based on the conditional probabilities, and determining a respective weighted probability value for each of the determined conditional probabilities based on prior probabiliy that the event occurred in an adjacent monitoring zone for each intelligent electronic device, that the event occurred in a primary monitoring zone of one intelligent electronic device, that the event occurred in a primary monitoring zone for more than one intelligent electronic device, wherein the step of determining whether the event occurred in a primary monitoring zone or a non-primary monitoring zone is based on the highest value of the weighted probabilities, wherein each prior probability is seen as a weight and each weighted probability value is obtained by multiplying a respective prior probability with the corresponding determined conditional probability.