Neodymium, gadolinium, terbium, holmium, erbium, thulium and their oxides. Chemical-spectral method of determination of impurities in oxides of rare-earth elements
Explosive atmospheres. Personnel competence of the facilities performing inspection and maintenance of the electrical installations intended for use in explosive atmospheres. Requirements
Low-voltage switchgear and controlgear assemblies. Protection against electric shock. Protection against unintentional direct contact to hazardous live parts
