OSHA Definition
Per OSHA 1910.147(b), an energy isolating device is a mechanical device that physically prevents the transmission or release of energy. This includes, but is not limited to: manually operated electrical circuit breakers, disconnect switches, manually operated switches by which the conductors of a circuit can be disconnected from all ungrounded supply conductors, line valves, blocks, and any similar device used to block or isolate energy.
What Is NOT an Energy Isolating Device
Push buttons, selector switches, and other control circuit type devices are not energy isolating devices. These control devices do not physically prevent energy transmission; they merely signal the equipment to stop. A worker who relies on a control circuit device instead of a true energy isolating device risks unexpected energization.
Lockability Requirements
Under 1910.147(c)(2)(iii), energy isolating devices designed for new equipment, major repairs, or modifications after January 2, 1990 must be capable of being locked out. A device is considered capable of being locked out if it has a hasp, a built-in locking mechanism, or can be locked without dismantling, rebuilding, or replacing the device.
In LOTOBuilder
Each isolation point in LOTOBuilder represents an energy isolating device. The system captures the device location, isolation method, energy type, and required hardware for each point.
