The MID (Measuring Instruments Directive) is a European directive governing the certification of measuring instruments, including AC and DC electricity meters.
It ensures the accuracy, reliability, and legal compliance of measurements used for commercial purposes. For Electric Vehicle charging infrastructure, this standard is particularly critical for DC meters, which directly measure the energy supplied in Direct Current to vehicle batteries. MID certification guarantees that these meters meet stringent performance criteria, allowing for fair and transparent billing for end-users. It also facilitates the traceability and monitoring of electricity consumption, a major consideration in managing electric fleets and optimizing energy costs.
The MID thus contributes to confidence in public charging systems and the secure deployment of electrical infrastructure.
In Canada, similar standards are established by Measurement Canada to ensure the accuracy of meters used for electricity billing.