What safety method involves signs and physical barriers to prevent accidental energization of electrical circuits?

The method that involves the use of signs and physical barriers to prevent accidental energization of electrical circuits is lock out/tag out. This safety protocol is critical in ensuring the safety of workers when they are performing maintenance or repair work on electrical systems.

Lock out/tag out procedures require that equipment be completely shut down and that any stored energy, such as electrical, mechanical, or hydraulic, be released or contained. By affixing a lock and tag to the energy-isolating device, it physically prevents the equipment from being turned on or energized until the lock is removed by the individual who placed it there. This system not only communicates that maintenance is in progress but also provides a physical barrier against inadvertent operation of the machinery, protecting employees from potential hazards.

In comparison to other options, grounding primarily addresses electrical faults and helps prevent shock hazards but does not involve barriers or signs. Isolation may refer to disconnecting equipment from power sources, yet it lacks the comprehensive nature of lock out/tag out in terms of worker safety and communication. Deferral does not apply as it simply means postponing action, lacking any proactive safety measures. Thus, lock out/tag out is essential for maintaining safety and preventing accidents during electrical work.