In the EPB standards the harmonized procedures need to be separated from the national or regional options, boundary conditions, input data and references to other EPB standards.
This has been achieved by the following set up:
Annex A/Annex B approach
Each EPB standard has the following two Annexes:
— Annex A (normative): mandatory (empty) framework template for choices and input data and references to other EPB standards
— Annex B (informative): framework template of Annex A completed with one set of voluntary default choices and input data and references to other EPB standards.
In general each individual user of the EPB standard is free to create his/her own data sheet according to the template of Annex A (i.e.: to replace the default choices and values of Annex B). But:
— For instance private parties can mutually agree (private contract) to use any specific set of choices and values (a completed data sheet according to the template of Annex A) for the assessment of the energy performance for their private use;
— In addition e.g. (national or regional) authorities can mandatory prescribe a specific set of choices and values (a specific data sheet according to the template of Annex A, replacing the default choices and input values of Annex B) for the assessment of the energy performance in the context of their building regulations (or different sets, depending on the application).
It is expected, if the default choices in Annex B are not followed due to national regulations, policy or traditions, that:
- national or regional authorities prepare data sheets containing the choices and national or regional values, according to the model in Annex A. In this case a national annex (e.g. NA) is recommended, containing a reference to these data sheets;
- or, by default, the national standards body will consider the possibility to add or include a national annex in agreement with the template of Annex A, in accordance to the legal documents that give national or regional values and choices.
Annex B with informative default choices
Annex B of each EPB standard provides one complete set of voluntary ("Informative") choices for all options, boundary conditions and input data. This is called the set of default choices.
These choices and values have the status of "experts best guess" and are not based on extensive studies involving national preferences and limitations.
By using Annex B, the procedure to calculate the overall energy performance becomes fully operational. This set can be adopted by any individual country or region as their national or regional set of choices.
This set is also intended as stimulus for further harmonization. The use of Standards with a common set of choices, input data and references to other EPB standards, facilitates the comparison of best practise by establishing a common metrics.
National data sheets
To provide flexibility in the application of the set of EPB standards, clearly identified options and national data remain necessary due to differences in climate, culture and building tradition, building typologies, policy and legal frameworks (including the type and level of quality control and enforcement). For example, climatic data is expected to be defined on a national and/or regional level in a national input data sheet.
See Template for national annex or national data sheet in the section Support/downloads