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Full video about category. NR-12. NBR 14153. ISO 13849. ISO 14119. ISO 24119. Demonstration of category on teaching bench. Machine Safety. NR-12 Practical training on the category of machinery and equipment safety systems. Fault masking. Overview of the teaching bench developed by Eng. Guilherme Neto and patented by Unisafety. Online training available. Simulation of safety system behavior according to installation category. Simulation of the main installation errors that downgrade the category of safety systems. Simulation of fault masking. Identification of weaknesses and limitations of machinery safety systems.