I-st group: for constructions from third to fifth categories of high-rise construction, its related infrastructure, electronic communication networks and facilities
II-nd group: for constructions of the transport infrastructure; constructions from third and fourth category
III-rd group for constructions from third to fifth category of the energy infrastructure
IV-th group: for constructions from third to fifth categories of public works infrastructure, hydrotechnical construction and environmental protection
V-th group for for individual types of construction and assembly works according to the National Classification of Economic Activities – from 45.11 to 45.50 – all types.
Bulgarian Construction Chambers
References
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