State system for the uniformity of measurements. State verification schedule for means measuring radionuclide activity, specific radioactivity, flux and flux density of б-, в-particles and photons of radionuclide sources
Low voltage distribution systems up to 1000 V a.c. and 1500 V d.c. Electrical safety. Equipment for testing, measuring or monitoring of protective measures. Part 6. Residual current operated protective devices in TT, TN and IT systems
