Tests for electric and optical fibre cables under fire conditions. Circuit integrity. Part 21. Procedures and requirements. Cables of rated voltage up to and including 0,6/1,0 kV
State system for ensuring the uniformity of measurements. State special standard and all-union verification schedule for means measuring of absorbed dose of X-ray radiation at maximum energy from 3 to 9 pJ (20 to 60 keV)
