Regulations Certificates And Sub-Metering
The object is to develop an energy metering strategy and so reduce energy use by 5–10% or more.
The Building Regulations Part L2
Changing requirements for sub–metering mean that new buildings and existing buildings undergoing major refurbishment, should have sub–meters installed to monitor the energy use of different services.
Many specifiers and installers are still failing to meet these requirements. But solutions do not have to be as complex as they might appear according to Mike Lawrence at Eaton.
Energy Performance Certificates Cover More Properties
Energy Performance Certificates, which rate the energy performance of buildings on a scale of A to G, have been required for large commercial properties since April 2008. This was extended in October 2008 to cover all new buildings, or existing buildings that are offered for sale or rent. While these requirements do not effect electrical installations directly, they do make sub–metering more desirable.
Part L2 Encourages Energy Efficiency
The Building Regulations Part L2 call for energy sub–metering, so that 90% of the estimated annual energy consumption of all fuels can be assigned to specific end uses such as Lighting, Heating, Ventilation, Pumps and Fans. The object is to develop an energy metering strategy and so reduce energy use by 5–10% or more. The requirements apply to any new non–domestic building, or any non–domestic building subject to significant modification, where the floor area is greater than 500m². Where the floor area is greater than 1000m², automatic meter reading and data collection is required.
The CIBSE offer more information in their General Information Leaflet GIL65, A guide to help designers meet Part L2 of the Building Regulations (PDF 0.45MB)