Level 3 distribution box with electricity meter

A Level 3 distribution box, or tertiary distribution box, delivers mains electricity to individual units and integrates electricity meters for monitoring consumption.Overview of Level 3 Distribution BoxA Level 3 distribution box is the final stage in a three-level electrical distribution system, typically found in residential or small commercial units. It receives power from the secondary distribution box (Level 2) and supplies single-phase mains electricity (220V) directly to households or individual equipment . Unlike Level 1 and Level 2 boxes, which handle three-phase power and larger circuit breakers, Level 3 boxes are designed for single-phase circuits and include single-phase circuit breakers for protection .Integration of Electricity MetersLevel 3 distribution boxes often incorporate electricity meters, either single or multi-phase, to measure energy consumption for billing or monitoring purposes . These meters can be:Whole current meters for direct measurement of current in single-phase or three-phase systems.CT-operated meters for higher current applications, using current transformers to safely measure electricity usage.Multi-meter boxes that allow multiple meters in one enclosure for apartment complexes or multi-unit buildings . The enclosures are designed to be tamper-proof, fire-resistant, UV-resistant, and IP-rated (IP33 to IP65) to ensure safety and durability in various environmental conditions .Protection and Safety FeaturesLevel 3 distribution boxes include:Single-phase circuit breakers to protect individual circuits.Residual Current Devices (RCDs) or leakage protectors to prevent electric shock.Bus bars (bare, insulated, or spring-loaded) for safe power distribution.Ingress protection to prevent dust and water entry, ensuring reliable operation outdoors or in damp environments . The principle of “one machine, one switch, one leakage, one box, one lock” is applied to ensure that each electrical device is independently protected and controlled .ApplicationsLevel 3 distribution boxes with integrated meters are commonly used in:Residential apartments for individual unit metering.Small commercial units where single-phase power is sufficient.Construction sites for temporary power distribution with monitoring.Multi-unit buildings using multi-meter boxes to consolidate metering in one location . These boxes provide a compact, safe, and efficient solution for distributing electricity while enabling accurate energy measurement and billing. In summary, a Level 3 distribution box electricity meter is a critical component in tertiary power distribution, combining single-phase power delivery, circuit protection, and energy metering in a secure and standardized enclosure suitable for residential and small commercial applications .