NEBOSH Practice Test

Safe isolation procedures primarily require disconnection of what?

1. Data systems and cables

2. All equipment's motive power sources

3. Only electrical power sources

4. Conveyor belt systems

The correct answer is: All equipment's motive power sources

Safe isolation procedures are crucial in ensuring that equipment is completely de-energized before maintenance or servicing is performed. The primary requirement of safe isolation procedures is to disconnect all equipment's motive power sources. This includes not just electrical power sources, but also any other sources of energy that could potentially activate equipment unexpectedly. When performing maintenance or repair work, if only some power sources were disconnected, there could be risks associated with residual energy or potential energy stored in mechanical systems. By ensuring that all motive power sources—whether they are electrical, hydraulic, pneumatic, etc.—are disconnected, the risk of accidents is significantly reduced. The other options are too narrow or specific, as they do not encompass the full range of energy sources that need to be isolated for safe operation. For instance, solely disconnecting electrical power only addresses one aspect of energy management, while a comprehensive safe isolation procedure addresses all sources that could pose a hazard during maintenance activities. This holistic approach is fundamental to maintaining safety in the workplace.