NEBOSH Practice Test

What is one of the first measures to take during the shutdown of a process to minimize risks?

1. Ensure all systems are tested before start-up

2. Isolate all services

3. Complete the PTW

4. Establish emergency plans

The correct answer is: Isolate all services

Isolating all services is a critical initial step during the shutdown of a process to minimize risks. This action involves disconnecting equipment and systems from their energy sources and any other services that could pose hazards. By safely isolating these services, the risk of unintended releases, electrical shock, or other dangerous incidents is significantly reduced. Proper isolation ensures that no residual energy or hazardous materials remain that could cause harm to personnel or the environment. It creates a safer working environment for those who may need to perform maintenance, inspections, or decommissioning activities. Ensuring a thorough isolation process also contributes to compliance with safety regulations and standards, ultimately fostering a culture of safety within the workplace. The other options focus on actions that are crucial but are often performed after the initial isolation is completed. For example, testing systems and completing permits to work (PTW) are vital steps in ensuring safe operations but are conducted once initial barriers to hazards have been established. Emergency plans are important for managing unforeseen events but assume that basic safety protocols have already been put in place.