Effective rate of duty: concessional ad valorem excise treatment for specified goods subject to documentary conditions. Notification prescribes an effective rate of duty for specified excisable goods in Chapters 83-93 by exempting duty in excess of the ad valorem rates shown in the Table, subject to the Annexure conditions and the relevant Lists appended thereto; eligibility requires prescribed certifications, undertakings, proof of intended use and, in certain entries, non availability of CENVAT credit or exclusion of component values from assessable value.