Which of the following is NOT one of the three contributing factors to electrical accidents?

The correct answer is the selection regarding proper training, as it is not considered one of the three contributing factors to electrical accidents. The three primary factors contributing to electrical accidents typically include unsafe equipment and installation, unsafe work performance, and unsafe environments.

Proper training is essential for ensuring that individuals are knowledgeable about electrical safety practices, but it doesn't fall into the category of factors that lead to accidents. Instead, it functions as a preventive measure that mitigates risk. When workers are properly trained, they are less likely to engage in unsafe work performance and are more capable of identifying and addressing unsafe equipment or environments. Therefore, while the importance of training cannot be understated, it does not contribute directly to the occurrence of electrical accidents in the same way that unsafe conditions and performance do.