Which of the following is an example of an energy control device?

An energy control device is specifically designed to help ensure that energy sources are isolated and that equipment is rendered inoperative during maintenance or repair work. Padlocks serve this purpose effectively by allowing authorized personnel to secure energy isolating devices, such as switches or valves, thereby preventing the accidental re-energizing of machinery while it is being serviced.

The use of padlocks is central to the Lockout/Tagout (LOTO) process, as they create a physical barrier that protects workers from the risks associated with unexpected machine start-up or the release of hazardous energy. They must only be removed by the person who applied them, ensuring that workers can rely on this system for their safety.

Other options, while tools or safety mechanisms, do not function as energy control devices. Wrenches and screwdrivers are hand tools used for tightening or loosening fasteners, but they do not inherently isolate energy sources. Machine guards, on the other hand, serve a protective function by safeguarding operators from exposed moving parts, but they do not provide a means of controlling or isolating energy sources during maintenance.