Electricity meter in the secondary distribution box

A secondary distribution box does not inherently include an electricity meter; it primarily distributes power to circuits, while meters are installed separately to measure consumption.

Function of a Secondary Distribution Box

A secondary distribution box, also known as a sub-distribution board, is designed to split incoming electrical power into multiple secondary circuits and provide protection through fuses or circuit breakers . It acts as an interface between the main supply and individual circuits within a building, ensuring safe and organized distribution of electricity . These boxes are commonly used in residential, commercial, and multi-unit buildings to manage power for different areas or tenants .

Relationship to Electricity Meters

While a secondary distribution box handles circuit distribution and protection, it does not measure electricity usage. Electricity meters are installed separately, typically at the point where the utility supply enters the building, to record energy consumption for billing purposes . In multi-unit buildings, each unit may have its own meter connected downstream of the secondary distribution box, but the box itself is not a metering device . The meter socket may be integrated near the distribution board for convenience, but the meter remains a distinct component certified for accurate energy measurement .

Summary

• Secondary distribution box: Distributes power, houses breakers/fuses, ensures safety.
• Electricity meter: Measures energy consumption, installed separately from the distribution box.
• Integration: Meters can be connected downstream of the distribution box, but the box itself does not perform metering . In essence, a secondary distribution box is focused on power management and circuit protection, while electricity meters are dedicated to tracking energy usage.