This International Standard applies only to newly manufactured static watt-hour meters of accuracy classes 1 and 2, for the measurement of alternating current electrical active energy of a frequency in the range 45 Hz to 65 Hz and to their type tests only. It applies only to static watt-hour meters for indoor and outdoor application consisting of a measuring element and register(s) enclosed together in a meter case. It also applies to operation indicator(s) and test output(s). It does not apply to: a) watt-hour meters where the voltage across the connection terminals exceeds 600 V (lineto- line voltage for meters for polyphase systems); b) portable meters; c) data interfaces to the register of the meter. Where the display and/or the memory (ies) is/are external or where other elements are enclosed in the meter case (such as maximum demand indicators, telemetering, time switches or remote control, etc.) this standard applies only to the metering section. This standard does not cover the acceptance tests and the conformity tests (both testing procedures are connected with legal requirements of the different countries and could only be taken care of partially). Regarding acceptance tests, a basic guideline is given in IEC 514. The reliability aspect is also not covered in this standard as there are no short-term test procedures available which would fit into type test documents to satisfactorily check this requirement.