1. BS 89-3:1990 EN 60051-3:1989 IEC 51-3:1984. Direct acting indicating analogue electrical measuring instruments and their accessories - Part 3: Specification for special requirements for wattmeters and varmeters

2. BS 89-4:1990 EN 60051-4:1989. Direct acting indicating analogue electrical measuring instruments and their accessories - Part 4: Specification for special requirements for frequency meter

3. BS 89-5:1990 EN 60051-5:1989. Direct acting indicating analogue electrical measuring instruments and their accessories - Part 5: Specification for special requirements for phase meters,power factor meters and synchroscopes

4. BS 89-6:1990 EN 60051-6:1989. Direct acting indicating analogue electrical measuring instruments and their accessories - Part 6: Specification for special requirements for ohmmeters (impedance meters) and conductance mete

5. BS 89-7:1990 EN 60051-7:1989. Direct acting indicating analogue electrical measuring instruments and their accessories - Part 7: Specification for special requirements for multi-function instruments

6. BS EN ISO/IEC 13273-1:2016. Energy efficiency and renewable energy sources - Common international terminology. Part 1: Energy efficiency (ISOIEC 13273-1:2015)

7. BS EN ISO/IEC 13273-2:2016. Energy efficiency and renewable energy sources - Common international terminology. Part 2: Renewable energy sources (ISOIEC 13273-22015)

8. BS EN ISO/IEC 13818-1:1997 (2000). Information technology - Generic coding of moving pictures and associated audio information - Part 1: Systems

9. BS EN ISO/IEC 17020:2012. Conformity assessment - Requirements for the operation of various types of bodies performing inspection

10. BS EN ISO/IEC 17021-1:2015. Conformity assessment - Requirements for bodies providing audit and certification of management systems. Part 1: Requirements