Various schemes for switching on electricity meters used at power facilities are considered. Examples of negative consequences from incorrect connection of meters are shown. The results of experimental determination of the errors of meters and current transformers are presented. Practical recommendations are given on checking the connection diagrams of meters, in the order of their replacement, etc.For specialists of metrological services and electrical departments of energy enterprises, energy sales organizations.May be recommended to specialists of the State Standard (Rostekhregulirovanie) Russia, to energy supervision inspectors responsible for the electrical facilities of electricity consumers.3rd edition, revised and supplemented.