Lockout/Tagout and Hazardous Energy Control Flashcards
6 cards from real STSC practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 Lockout/Tagout and Hazardous Energy Control flashcards as text
Under OSHA construction standards, what is the FIRST step a worker must take before performing maintenance on powered equipment?
Answer: De-energize the equipment and apply a lockout device
OSHA's hazardous energy control requirements mandate that the equipment be fully de-energized and a lockout device applied before any maintenance or servicing begins. Notification and PPE are secondary steps that follow, not precede, isolation.
A crew must replace a hydraulic hose on an excavator. After shutting off the engine, what additional step is REQUIRED before starting the repair?
Answer: Bleed residual hydraulic pressure and verify the zero-energy state
Stored hydraulic energy can cause sudden, violent movement even after the engine is off. OSHA requires that all stored energy — including hydraulic, pneumatic, spring, and gravitational — be released and verified at zero before work begins.
When multiple authorized workers are simultaneously performing maintenance on the same piece of equipment, OSHA requires:
Answer: Each authorized worker to apply their own personal lock to the energy-isolating device or hasp
OSHA group lockout procedures require each authorized employee to apply their own personal lock. No worker's safety should depend on another person's lock — each individual must be able to verify their own protection.
A tagout device may be used WITHOUT an accompanying lockout device ONLY when:
Answer: The energy-isolating device cannot physically accommodate a lock
Tags alone may substitute for locks only when the physical design of the energy-isolating device prevents a lock from being applied. Even then, OSHA requires additional equivalent means of protection, because a tag by itself provides no physical restraint.
Which of the following is classified as a form of 'stored energy' that must be controlled during a lockout/tagout procedure?
Answer: Compressed air remaining in a pneumatic line
Stored energy includes mechanical (springs, gravity), electrical (capacitors), thermal (steam), chemical, and pneumatic (compressed air or gas) energy. Compressed air in a pneumatic line can release suddenly and cause unexpected equipment movement or injury.
Who is defined as an 'authorized employee' under OSHA's lockout/tagout standard?
Answer: A worker who applies lockout/tagout devices to control hazardous energy
OSHA defines an 'authorized employee' as a person who locks out or tags out machines to perform servicing or maintenance. This is distinct from an 'affected employee,' who operates the equipment but does not perform the maintenance.