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Power metering box, also known as an electric meter box or simply a meter box, is a device used to measure and monitor the electricity consumption of a building or a specific area within a facility. The main functions and features of a power metering box include:

1. Measurement of Electricity Consumption: The primary purpose is monitor the kilowatt-hours (kWh) of energy consumed and sometimes other parameters like voltage, current, power factor, and frequency.

2. Data Recording: Advanced metering boxes often have the capability to record and store usage data over time, allowing for detailed analysis of energy consumption patterns. This can be useful for billing purposes, energy efficiency assessments, and demand response programs.

3. Protection and Safety: Meter boxes are designed with safety features to protect against electrical hazards such as short circuits, overloads, and unauthorized access. They are typically made from non-conductive materials and may include circuit breakers or fuses to prevent electrical accidents.

4. Compatibility with Smart Grid Technologies: Modern metering boxes may be equipped with smart meters that can communicate usage data wirelessly to the utility company, enabling real-time monitoring, remote management, and more accurate billing.
   

5. Installation Flexibility: Power metering boxes come in various sizes and designs to accommodate different installation requirements. They can be mounted on walls, poles, or in underground vaults, depending on the location and local regulations.

Overall, a power metering box serves as an interface between the electrical grid and the consumer, ensuring safe, reliable, and efficient distribution and monitoring of electricity.