Deenergized

Deenergized refers to the condition in which an electrical system, device, or circuit is not supplied with electrical power and has no circulating current. In practice, deenergizing means isolating the equipment from energy sources and ensuring the absence of voltage before work is performed. The term is used across electrical, mechanical, and safety contexts.

In safety and engineering, deenergization is a prerequisite for maintenance, testing, and repair. Methods commonly involve removing the power source, opening switches to interrupt circuits, and applying mechanical isolation. In many workplaces, deenergization is supported by lockout/tagout programs that prevent re-energization while work is underway. Verification using appropriate test instruments is typically required to confirm a deenergized state, including checks at relevant points and ensuring that energy storage devices have been discharged.

Important caveats include the fact that deenergized does not guarantee zero energy. Stored energy in capacitors, inductors, batteries, springs, or pressurized systems can remain and pose hazards. Procedures often call for addressing these energy stores, such as discharging or relieving stored energy and securing mechanical components before work continues.

Etymology-wise, deenergized is formed from the prefix de- and the adjective energized, meaning made non-energized or without voltage. In different industries, the concept supports safety rules in electrical work, machinery maintenance, and energy management. Related terms include lockout-tagout, electrical isolation, grounding, and safe work practices.