Rigid precision coaxial and their associated precision connectors - Part 4: 21 mm rigid precision coaxial line and associated hermaphroditic precision coaxial connector - Characteristic impedance 50 ohm (Type 9/21) - Characteristic impedance 75 ohms (Type 6/21)

Domestic cooking appliances burning gas - Part 2-1: Rational use of energy - General; German version FprEN 30-2-1:2024

Glass in building - Special basic products - Glass ceramics - Part 2-1: Definitions and general physical and mechanical properties; German and English version prEN 1748-2-1:2017

Explosives for civil uses - Detonators and detonating cord relays - Part 21: Verification of flash-over voltage of electric detonators; German version FprEN 13763-21:2024

Gas-fired central heating boilers - Part 2-1: Specific standard for type C appliances and type B2, B3 and B5 appliances of a nominal heat input not exceeding 1 000 kW; German version EN 15502-2-1:2022+A1:2023

Power transformers - Additional European requirements - Part 2-1: Medium power transformer - General requirements; German version EN 50708-2-1:2020

Cable trunking and ducting systems for electrical installations - Part 2-1: Cable trunking systems and cable ducting systems intended for mounting on walls and ceilings (IEC 23A/743/CDV:2015)

Universal Serial Bus interfaces for data and power - Part 2-1: Universal Serial Bus Specification, Revision 2.0 (IEC 100/2331/CDV:2014); English version FprEN 62680-2-1:2014

Rotating electrical machines - Part 2-1: Standard methods for determining losses and efficiency from tests (excluding machines for traction vehicles)

Environmental testing - Part 2-1: Tests - Test A: Cold (IEC 104/1020/CD:2023);