DS EN 50216-4:2002 Power Transformer And Reactor Fittings - Part 4: Basic Accessories (Earthing Terminal, Drain And Filling Devices, Thermometer Pocket, Wheel Assembly) Defines basic accessories of transformers, such as: - thermometer pockets, to be used for liquid immersed transformers; - earth terminals, to be used for liquid immersed and dry-type transformers; - d