In what circumstances does an employee have the right to refuse to do work?

An employee has the right to refuse work if they believe that the task poses a direct threat to their health or safety, such as working in unsafe conditions or handling hazardous materials without proper training. Additionally, refusal is justified if the work violates legal regulations or goes against company policies. Employees should report their concerns to a supervisor or safety officer, and it's important to follow established procedures for refusing unsafe work.