1. BS EN 61857-1:2009. Electrical insulation systems �â�€�“ Procedures for thermal evaluation - Part 1: General requirements �â�€�“ Low-voltage

2. BS EN 61857-21:2009. Electrical insulation systems - Procedures for thermal evaluation - Part 21: Specific requirements for general-purpose models - Wire-wound applications

3. BS EN 61858-1:2014. Electrical insulation systems - Thermal evaluation of modifications to an established electrical insulation system (EIS) - Part 1: Wire-wound winding EIS

4. BS EN 61858-2:2014. Electrical insulation systems - Thermal evaluation of modifications to an established electrical insulation system (EIS) - Part 2: Form-wound EIS

5. BS EN 61869-1:2009. Instrument transformers - Part 1: General requirements

6. BS EN 61869-2:2012. Instrument transformers - Part 2: Additional requirements for current transformers

7. BS EN 61869-3:2011. Instrument transformers - Part 3: Additional requirements for inductive voltage transformers

8. BS EN 61869-4:2014. Instrument transformers - Part 4: Additional requirements for combined transformers

9. BS EN 61869-5:2011. Instrument transformers - Part 5: Additional requirements for capacitor voltage transformers

10. BS EN 61881-1:2011. Railway applications - Rolling stock equipment - Capacitors for power electronics - Part 1: Paperplastic film capacitors