Flexible insulating sleeving - Part 3: Specifications for individual types of sleeving - Sheets 400 to 402: Glass textile sleeving with silicone elastomer coating
Edition 2003-07-30

Maritime navigation and radiocommunication equipment and systems - Digital interfaces - Part 400: Multiple talkers and multiple listeners - Ship systems interconnection - Introduction and general principles (Endorsed by AENOR in November of 2002.)
Edition 2002-11-01

Electronic Design Interchange Format (EDIF) - Part 2: Version 400. (Endorsed by AENOR in November of 2000.)
Edition 2000-11-01

TESTS ON OIL-FILLED (FLUID FILLED), PAPER- OR POLYPROPYLENE PAPER LAMINATE-INSULATED, METAL-SHEATHED CABLES AND ACCESSORIES FOR ALTERNATING VOLTAGES UP TO AND INCLUDING 400 KV (UM = 420 KV) (Endorsed by AENOR in June of 1999.)
Edition 1999-06-01

Standard Test Method for Corrosion Testing of Products of Zirconium, Hafnium, and Their Alloys in Water at 680°F (360°C) or in Steam at 750°F (400°C)
Edition 2019

EDIF Version 400 (EIA-682-96) Electronic Design Interchange Format
Edition 1996-12

Scalable Low-Voltage Signalling for 400 mV (SLVS-400)
Edition 2001-10

IEEE Standard for Ethernet Amendment 4: Physical Layer Specifications and Management Parameters for 100 Gb/s, 200 Gb/s, and 400 Gb/s Electrical Interfaces Based on 100 Gb/s Signaling
Edition 2022

IEEE Standard for Ethernet - Amendment 3: Physical Layer Specifications and Management Parameters for 100 Gb/s, 200 Gb/s, and 400 Gb/s Operation over Optical Fiber using 100 Gb/s Signaling
Edition 2022

IEEE Standard for Ethernet - Amendment 9: Media Access Control Parameters for 800 Gb/s and Physical Layers and Management Parameters for 400 Gb/s and 800 Gb/s Operation
Edition 2024