DS EN 50123-7-3:2003 Railway Applications - Fixed Installations - D.C. Switchgear - Part 7-3: Measurement, Control And Protection Devices For Specific Use In D.C. Traction Systems - Isolating Voltage Transducers And Other Voltage Measuring Devices Provides requirements for isolating voltage transducers and other voltage measuring devices used in d.c. railway applications, fixed installations.