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Abbreviations: ILO, international labour organization; WHO, world health organization; CNAE, national classification of economic activities Introduction In Brazil, the labor safety legislation is based on the federal constitution, on the consolidation of labor laws (in Portuguese known as CLT), on the regulatory standards (in Portuguese known as NR) and other complementary laws such as ordinances, decrees and international conventions of the International Labour Organization (ILO) and of the World Health Organization (WHO). The degree of activity risk ranges from 1 to 4, according to the National Classification of Economic Activities (CNAE). This risk increases the more dangerous the activity is considered, i.e., degree 4 is the maximum hazard. Table 1 shows that on civil construction predominates risk degree 4.1 Brazilian ministry of labor and employment’s database, divides civil construction into three groups of accidents: specialized construction services (concentrates 20.9% of sector accidents); large group civil construction (43.1%) and infrastructure works (36%).2

Fundamental Brazilian standards for safety at work in civil construction