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Operational ratings assessor accreditation
"In order to assess the energy effficiency of public buildings the assessor must be accredited. In the UK larger public buildings are required to have a Display Energy Certificate (DEC) which shows its operation rating (OR) and an associated Advisory Report (AR). DECs may only be produced by an accredited Operational Ratings Assessor (ORA). In order to become accredited, assessors must meet the relevant National Occupational Standards (NOS) in full."@en