Polymeric insulators for indoor and outdoor use with a nominal voltage greater than 1000 V. General definitions, test methods and acceptance criteria— 38 стр.
Water quality. Biological classification of rivers. Guidance on the interpretation of biological quality data from surveys of benthic macroinvertebrates— 16 стр.
Polymeric insulators for indoor and outdoor use with a nominal voltage greater than 1000 V. General definitions, test methods and acceptance criteria— 38 стр.
Composite hollow core station post insulators for substations with a.c. voltage greater than 1 000 V and d.c. voltage greater than 1 500 V. Definitions, test methods and acceptance criteria— 28 стр.