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Quizzes > Health & Medicine

Which Is Not an Energy Isolating Device? LO/TO Quiz

Quick lockout tagout quiz to check your safety know-how. Instant results.

Editorial: Review CompletedCreated By: Izah NuhaanUpdated Aug 25, 2025
Difficulty: Moderate
2-5mins
Learning OutcomesCheat Sheet
Paper art shows padlock switch fuse and unisolated circuit on teal background for LO-TO safety quiz

This quiz helps you identify which item is not an energy isolating device and choose the right lockout/tagout steps at work. After you finish, build skills with the osha lockout tagout quiz, try a quick lockout tagout test, and practice with common lockout tagout test questions.

Which of these is NOT considered an energy isolating device?
Ball valve
Circuit breaker
Knife switch
Push button
Push buttons are control devices rather than energy isolating devices because they only momentarily interrupt or start circuit operation. They do not provide a physical means to block energy sources or be locked out for maintenance. Energy isolating devices must physically hold an energy source off and be lockable.
Which device below is NOT an energy isolating device?
Circuit breaker
Pilot light
Disconnect switch
Gate valve
A pilot light only indicates status and does not physically interrupt or block an energy source. Energy isolating devices must create a visible, physical break in the circuit or fluid line and accept a lock. Pilot lights are part of control circuitry and cannot be locked out.
Which of the following is NOT classified as an energy isolating device?
Fuse
Ball valve
Disconnect switch
Knife gate valve
Fuses are overcurrent protection devices that open upon overload but are not intended to isolate energy for maintenance. They are not lockable and cannot be used to hold a circuit open during service. Only manual disconnect switches, valves, and similar devices that can be locked out qualify.
Which sensor device below is NOT an energy isolating device?
Circuit breaker
Limit switch
Gate valve
Lockable disconnect switch
Limit switches sense position or travel limits but do not physically isolate an energy source. They are part of control circuits rather than positive isolation means. Energy isolating devices physically block or disconnect power and accept locks.
Which of these is NOT an energy isolating device?
Ball valve
Pressure-relief valve
Disconnect switch
Knife switch
Pressure-relief valves open automatically to protect systems and cannot be locked out. They cannot provide a positive, lockable isolation point for maintenance. Energy isolating devices must remain in the off position until released by the authorized person.
Which control device is NOT an energy isolating device?
Circuit breaker
Proximity sensor
Disconnect switch
Gate valve
Proximity sensors detect the presence of objects and form part of control logic, not physical isolation. They do not break the energy path or accept a lock. Energy isolating devices must physically block or disconnect energy.
Which of the following cannot serve as an energy isolating device?
Pilot-operated solenoid valve
Knife switch
Ball valve with padlock
Manual disconnect switch
Pilot-operated solenoid valves are control devices and can re-energize automatically; they are not reliable for positive isolation. They cannot be locked out. Energy isolating devices must remain off mechanically and accept a personal lock.
Which item is NOT considered an energy isolating device?
Photoelectric safety sensor
Gate valve
Disconnect switch
Circuit breaker
Photoelectric safety sensors are used for detection and control but do not interrupt or block energy. They cannot be locked out as isolation means. Only devices that provide a physical, lockable break in a power or fluid line qualify.
Which is NOT an energy isolating device under LO/TO practices?
Gate valve
Disconnect switch
Photocell safety sensor
Circuit breaker
Photocell safety sensors are control devices that respond to light and do not physically isolate energy. They cannot be locked out to prevent machine startup. Energy isolating devices must create a direct, physical break in the energy source.
In pneumatic systems, which of these is NOT an acceptable energy isolating device?
Lockable air shutoff valve
Quick disconnect coupling
Lockable in-line ball valve
Blind flange
Quick disconnect couplings can separate under pressure and do not provide a positive, lockable shutoff. They are not suitable for LO/TO. Energy isolating devices must be rigid, lockable, and prevent energy flow until released by the authorized person.
Which hydraulic component is NOT considered a positive energy isolating device?
Blank flange
Spade (line blade)
Check valve
Spectacle blind
Check valves allow flow in one direction and cannot be locked or held closed for maintenance. They do not provide a positive physical block. Energy isolating devices must hold energy sources off and be lockable.
Which control circuit device is NOT an energy isolating device?
Emergency stop push button
Ball valve
Lockable disconnect switch
Selector switch
Emergency stop buttons interrupt control circuits momentarily and may auto-reset; they are not designed for positive isolation. They cannot be locked out for maintenance. Energy isolating devices must keep energy sources off and accept a lock.
Which of the following valve types is NOT acceptable as an energy isolating device?
Globe valve
Gate valve
Ball valve
Butterfly valve
Butterfly valves often cannot provide full positive isolation and may leak under pressure. They cannot reliably block energy for maintenance. OSHA requires energy isolating devices to produce a full physical break and be lockable.
Which electrical component cannot serve as a lockable energy isolating device?
Lockable circuit breaker
Non-lockable circuit breaker
Motor disconnect switch
Knife switch
Non-lockable circuit breakers cannot accept a personal lock and may be returned to the on position by others. They do not meet the OSHA requirement for positive, lockable isolation. Only devices designed for lockout qualify.
Which of these is NOT an energy isolating device under OSHA guidelines?
Ball valve
Pressure relief valve
Disconnect switch
Blank flange
Pressure relief valves open automatically to relieve excess pressure and cannot be lockout devices. They do not provide a stable isolation point. OSHA requires devices that can be locked in the off position for maintenance.
For fluid lines, which item is NOT considered an energy isolating device?
Pipe cap
Spade (line blade)
Blind flange
Spectacle blind
Pipe caps can be removed under pressure and are not designed for lockout. They do not guarantee a positive, visible break in the line. Blinds and spades are designed for positive isolation and lockability.
Which of these is NOT an energy isolating device under OSHA 1910.147?
Solid-state relay
Circuit breaker
Gate valve
Valved disconnect switch
Solid-state relays control circuits electronically without providing a physical, lockable break in the power path. OSHA requires an energy isolating device to physically disconnect energy and accept a lock. Electronic devices cannot guarantee zero energy flow for maintenance.
Which device cannot be locked out and therefore is NOT an energy isolating device?
Disconnect switch
Gate valve
Pressure-relief valve
Manual motor starter
Pressure-relief valves open automatically under overpressure and lack provision for a lockout. They are safety devices, not isolators. OSHA mandates that energy isolating devices must be lockable and maintain energy OFF.
On hydraulic systems, which is NOT considered a positive isolating device?
Spectacle blind
Line spade
Blank flange
Coupling nut
Coupling nuts may not create a visible or reliable break and cannot be locked to prevent reconnection. OSHA requires devices that visibly interrupt fluid flow and accept locks. Blinds and spades meet those requirements.
In electrical switchgear, which is NOT allowed as an energy isolating device?
Circuit breaker
Push button
Disconnect switch
Knife switch
Push buttons merely control control circuits and often reset automatically. They cannot be locked in the off position. OSHA requires a physical device that stays open and accepts a personal lock.
Which of the following control circuit elements is NOT an energy isolating device?
Foot switch
Selector switch
Key-operated disconnect
Toggle switch
Foot switches are momentary controls and cannot remain in the OFF position for prolonged lockout. They lack a mechanism to accept a lock. Energy isolating devices must hold the energy source in the off position.
In pneumatic tool setups, which is NOT an energy isolating device?
Lockable bleed valve
Main air shutoff valve
Lockable ball valve
Quick exhaust valve
Quick exhaust valves are used to vent air quickly but cannot be locked to isolate the supply. They do not provide a stable isolation point. OSHA requires a device that remains closed and accepts a lock.
For an automated production line, which is NOT an energy isolating device?
Control panel main disconnect
Safety interlock switch
Lockable circuit breaker
Pilot light
Pilot lights are indicators and do not interrupt power or fluid lines. They cannot be locked out. Energy isolating devices must physically break the energy source and stay off under lockout.
According to NFPA 70E, which is NOT a recognized energy isolating device?
Motor disconnect switch with lock provision
Switchgear load?break switch
Fused safety disconnect
Single-pole changeover (SPCO) relay
SPCO relays switch control circuits electronically and do not provide a physical lockable break in the power conductors. NFPA 70E requires a visible, physical disconnection for safe work. Only devices designed for manual, lockable isolation qualify.
Under ISO 13849 safety standards, which is NOT classified as an energy isolating device?
Emergency stop push button
Safety interlock gate switch
Safety PLC output relay
Lockable mechanical disconnect
Safety PLC outputs are control elements that signal circuits but do not mechanically isolate power. ISO 13849 requires physical disconnection for energy isolation. Only devices that can be locked out and physically interrupt energy qualify.
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Study Outcomes

  1. Understand LO/TO Safety Principles -

    Gain a clear grasp of lock out tag out fundamentals and why energy isolation is critical for OSHA compliance.

  2. Identify Energy Isolating Devices -

    Learn to recognize the tools and mechanisms that qualify as energy isolating devices in various industrial settings.

  3. Differentiate Non-Isolating Devices -

    Practice answering which of the following is not an energy isolating device to spot the device that fails to isolate energy properly.

  4. Apply Correct LO/TO Procedures -

    Translate your quiz insights into practical steps for executing lock out tag out procedures safely and effectively.

  5. Evaluate Your Safety Knowledge -

    Use the scored quiz format to assess your mastery of energy isolation concepts and identify areas for improvement.

  6. Reinforce Safe Work Practices -

    Build confidence in maintaining a hazard-free workplace by reinforcing key LO/TO safety measures.

Cheat Sheet

  1. Definition of Energy Isolating Device -

    Per OSHA standard 29 CFR 1910.147, an energy isolating device is a mechanical means (like a lockable disconnect switch or line valve) that physically prevents energy transmission. Recognizing these devices helps you differentiate true isolation points from mere control elements during any LOTO safety test.

  2. Distinguishing Non-Isolating Devices -

    On a lock out tag out quiz that asks which of the following is not an energy isolating device, remember that push button starters, selector switches, and pilot devices only control the equipment without physically isolating energy. A handy mnemonic is "If you can press it, you can't lock it" to differentiate control devices from true isolating hardware.

  3. LOTO Procedure Steps and Verification -

    Follow the standard LOTO sequence: prepare by notifying affected employees, isolate with an approved device, and secure it with a lock. Finally, verify zero energy by testing with properly rated tools, and always test your meter on a known live source to confirm it's functioning before checking the isolated circuit.

  4. Types of Hazardous Energy -

    LOTO best practices cover electrical, mechanical, hydraulic, pneumatic, chemical, and thermal energies, each requiring specific isolating methods like lockable circuit breakers, bleed-off valves, or blank flanges. Understanding each energy type ensures the right isolation device is used and strengthens your performance on any energy isolating device quiz.

  5. Record-Keeping and Periodic Inspections -

    OSHA mandates that employers instruct authorized employees on proper record keeping for locks, tags, and inspection logs as part of 29 CFR 1910.147 documentation requirements. Regular periodic inspections and updates to LOTO procedures reinforce safety culture and prepare candidates for advanced lock out tag out quiz questions.

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