Basic supporting structures of radioelectronic means. Part 2-4. Sectional specification. Interface co-ordination dimensions for the 25 mm equipment practice. Adaptation dimensions for subracks or chassis applicable in cabinets or racks in accordance with IEC 60297-3-100 (19 in)
Explosive atmospheres. Personnel competence of the facilities performing repair and overhaul of the electrical installations intended for use in explosive atmospheres. Requirements