This Standard specifies requirements and desirable features of polyphase multifunction (non-demand) watthour meters (Class 1), either direct-connected or for connection via current transformers (CTs). No provision is made for connection via voltage transformers (VTs).The Standard applies to meters that are suitable for installation outdoors on 240/415 V,50 Hz systems with time-of-use (TOU) tariffs, block tariffs, controlled tariffs or combinations thereof.NOTE: This Standard also lists information to be supplied with enquiries and orders for meters (see Appendix A).