OSHA Definition
Per OSHA 1910.147(b), an energy isolating device is capable of being locked out if it has a hasp or other means of attachment to which, or through which, a lock can be affixed, or it has a locking mechanism built into it, or lockout can be achieved without the need to dismantle, rebuild, or replace the energy isolating device or permanently alter its energy control capability.
Significance
Whether a device is capable of being locked out determines whether lockout or tagout must be used. If the device can be locked out, lockout is required unless the employer demonstrates tagout equivalence. Since January 2, 1990, all new or substantially modified energy isolating devices must be designed to accept a lockout device.
Practical Assessment
Walk down your facility's energy isolating devices and assess each one. Circuit breakers with built-in lockout tabs, disconnect switches with hasp provisions, and valves with lockout-compatible handles are all capable of being locked out. Older equipment without these features may require aftermarket lockout adapters.
