NEIEP Mechanics Practice Exam

The installation of safety barricades across hoistway openings is crucial for ensuring the safety of workers and bystanders during construction or maintenance activities related to an elevator. The correct choice indicates that barricades should be installed after the rough or finished floors are in place. This timing is important because having a stable and secure floor ensures that the barricades can be effectively anchored and will provide adequate protection.

When barricades are installed after the floors are in place, it helps to prevent accidents that could occur if someone were to fall through the hoistway opening. Additionally, proper barricading ensures that no unauthorized individuals can access hazardous areas during construction and maintenance activities.

Other timing options would not provide the same level of safety. If the barricades were put in place before drilling begins or during the assembly of the elevator, there could be vulnerabilities or insufficient structural integrity of the barricade due to the lack of a finished floor. Installing barricades once the elevator is operational does not address the potential risks during installation or maintenance where workers are still active around the hoistway, thereby increasing the chance of accidents. Overall, the focus on ensuring a secured environment with the right installation timing of barricades enhances overall safety protocols during elevator work.