DIN EN IEC 62053-41:2025-02

This part of IEC 62053 applies only to static watt-hour meters of accuracy classes 0,5 and 1 for the measurement of DC electrical energy in DC systems, and it applies to their type tests only. This document applies to electricity metering equipment designed to: - measure and control electrical energy on electrical networks with two poles where one of the poles is connected to earth and with voltage up to 1 500 V DC; - have all functional elements, including add-on modules, enclosed in, or forming a single meter case with the exception of indicating displays; - operate with integrated or detached indicating displays, or without an indicating display; - be installed in a specified matching socket or rack; - optionally, provide additional functions other than those for measurement of electrical energy. They may be used for measuring DC electrical energy, amongst others, in the following application areas: - in EV (electrical vehicle) charging stations or in EV charging infrastructures, if the measurement is placed on the DC side; - in information technology (IT) server farms; - in DC supply points for communication equipment; - in low voltage DC networks for residential or commercial areas, if the measurement is placed on the DC side; - in solar PV (photovoltaic) systems where DC power generation is measured; - in DC supply points for public transport networks (for example, trolleybus, etcetera). Meters designed for operation with low power instrument transformers, LPITs as defined in the IEC 61869 series, may be tested for compliance with this document only if such meters and their LPITs are tested together and meet the requirements for directly connected meters. This document does not apply to: - meters in which the voltage between the two poles, one of which is connected to earth, exceeds 1 500 V DC; - meters intended for use in networks other than those with two poles, one of which is connected to earth; - meters intended for connection to low-power instrumentation transformers (LPITs in accordance with the IEC 61869 series of standards) when tested without these transformers; - meter systems consisting of several devices (except LPITs) located at a distance from each other; - portable meters; - meters used in rail vehicles, vehicles, ships, and aircraft; - laboratory and meter testing equipment; - standard meters; - data interfaces to the meter's counting device; - suitable plug-in devices or mounting frames used for the installation of electricity meters; - all other electricity meter functions. Typical examples of applications are direct current electricity meters up to 1 500 V DC.