Inženjering uzajamnog uticaja okoline i opreme (EE) — Uslovi okoline i ispitivanja uticaja okoline na telekomunikacionu opremu — Deo 1-4: Klasifikacija uslova okoline — Stacionarna upotreba na lokacijama nezaštićenim od vremenskih uticaja
Environmental Engineering (EE); Environmental conditions and environmental tests for telecommunications equipment; Part 1: Classification of environmental conditions; Sub-part 4: Stationary use at non-weatherprotected locations