6 Steps Of Lock Out Tag Out

Have you ever stood in a factory or a workshop, looking at a piece of heavy machinery that’s acting up, and felt that tiny, nagging voice in the back of your head? That voice that says, "I really shouldn't reach my hand in there until I'm 100% sure this thing won't kick back to life."

It’s a gut feeling. And if you’ve been in industrial environments for any length of time, you know that gut feeling is usually right.

But gut feelings aren't a safety protocol. " We rely on Lockout Tagout, or LOTO. In the world of industrial maintenance and repair, we don't rely on luck or "I think it's off.It is the difference between a routine maintenance shift and a life-altering accident.

What Is Lockout Tagout

At its core, Lockout Tagout is a set of specific procedures used to see to it that machines are properly shut off and cannot be started up again unexpectedly. It’s about controlling "hazardous energy."

When we talk about energy, I'm not just talking about electricity. That said, i've seen people get hurt by things they didn't even consider "power. " We're talking about hydraulic pressure, pneumatic (air) pressure, thermal energy (heat), gravity (a heavy part that could fall), and mechanical energy (moving parts).

The "Lockout" Part

This is the physical side. It involves placing a physical device—usually a padlock—on an energy-isolating device (like a circuit breaker or a valve). Once that lock is on, the machine literally cannot be turned on by anyone else. It’s a physical barrier to danger.

The "Tagout" Part

The tag is the communication piece. It’s a durable, highly visible label attached to the lock. It tells everyone else on the floor: "Hey, someone is working on this. Do not touch this switch." It identifies who is doing the work and why.

The short version is this: Lockout is the physical protection, and Tagout is the warning. You need both to stay safe.

Why It Matters / Why People Care

You might think, "I've been turning this machine off for ten years without an issue. Why do I need all this paperwork and hardware?"

Here’s the reality: accidents don't happen when you're being careful. They happen when you're in a rush, when you're tired, or when you assume someone else has already handled the power.

When LOTO protocols fail, the results are almost always catastrophic. Consider this: we're talking about crushed limbs, electrocution, or worse. We aren't talking about a bruised knuckle. The reason companies care—and the reason OSHA (the Occupational Safety and Health Administration) cares—is because human error is inevitable.

If a coworker walks by and sees a machine that looks "off," they might try to test it. If you haven't locked it out, they might flip the switch, and suddenly, you're in the line of fire. And lOTO removes the element of "human assumption" from the equation. It makes safety a physical certainty rather than a mental hope.

How It Works (The 6 Steps of Lockout Tagout)

Doing LOTO isn't just about snapping a padlock on a switch and calling it a day. Also, if you skip steps, you're essentially playing Russian roulette with your safety. To do it right, you have to follow a very specific, disciplined sequence.

1. Preparation and Notification

Before you even touch a tool, you have to prepare. This sounds simple, but it's where most people start to get sloppy. You need to identify every single energy source that could power that machine. Consider this: is it plugged into a wall? Think about it: is there a compressed air line? Is there a heavy weight held up by a hydraulic cylinder?

Once you know what you're dealing with, you have to notify everyone in the area. Day to day, you need to tell the operators, the supervisors, and anyone else in the vicinity that the machine is going down for maintenance. You can't just start working in silence. This prevents someone from trying to restart the machine while you're mid-repair.

2. Shutting Down the Equipment

This is the part that feels easy. You follow the manufacturer's specific shutdown procedures. You don't just hit the "Emergency Stop" button and walk away.

Here's a pro tip: The E-stop is a control device, not an isolation device. Think about it: using an E-stop to "lock out" is a common mistake. Worth adding: an E-stop can fail, or it can be accidentally released. You need to shut the machine down using its normal operating controls first, ensuring it has come to a complete stop.

3. Isolation of Energy Sources

Now we get to the real work. You have to physically disconnect the machine from its energy sources. This means flipping the breaker, closing the valves, or blocking the movement of parts.

You are essentially creating a gap between the power source and the machine. Here's the thing — if the machine is connected to a battery, you pull the battery or flip the disconnect. If it's connected to a pipe, you close the valve. You are isolating the machine from the world of energy.

4. Applying the Lockout/Tagout Devices

This is the "Lockout" part we talked about. Once the energy is isolated, you apply your personal lock and your tag.

One rule is non-negotiable: One person, one lock, one key.

Never, under any circumstances, use someone else's lock or allow someone else to hold your key. Still, if you are working on a machine, that machine belongs to you, and your lock is your life insurance policy. If three people are working on a machine, there should be three separate locks on that isolation point.

5. Dissipating Stored Energy

This is the step that most people skip, and it's the one that kills. Even after you turn off the power, energy can stay "trapped" in the system.

Think about a hydraulic press. Think about a large capacitor in an electrical panel; it can hold a charge long after the power is cut. Even so, even if the pump is off, there is still high-pressure fluid trapped in the lines. Think about a heavy metal arm held up by a spring; that spring still has potential energy.

You have to bleed the lines, ground the electrical charge, or block the mechanical parts so that all "residual" energy is gone. You have to make sure the machine is truly "dead."

6. Verification (The Most Important Step)

I'll say it again: Verification is the most important step.

For more on this topic, read our article on lock out tag out procedure pdf or check out when is fall protection required in the construction industry.

Once you have locked it, tagged it, and dissipated the energy, you have to prove it worked. How? You try to start the machine. Hit the "On" button. Try to move the lever.

If the machine stays dead, you've succeeded. If it moves, or if a light flickers, you haven't isolated the energy properly, and you need to go back to step three. This is the "test" that ensures your life is actually protected before you put your hands in the danger zone.

Common Mistakes / What Most People Get Wrong

I've seen it a thousand times. But people are experienced, they're fast, and they're confident. But confidence is the enemy of safety when you're cutting corners.

The biggest mistake? The "Quick Fix" mentality.

"I'm only going to clear this jam, it'll take five seconds, I don't need to do a full LOTO.It doesn't matter if it takes five seconds or five hours; if you are entering a danger zone, you follow the protocol. " That is exactly how accidents happen. No exceptions.

This is the kind of thing that separates good results from great ones.

Another huge mistake is relying on a single energy source. I've seen technicians turn off the main electrical breaker but forget that the machine is also connected to a pneumatic air line. They think they're safe, but the air pressure can still move a component or cause a sudden burst of movement. You must isolate every source.

Finally, there is the misuse of "Control Circuit" shutdowns. As I mentioned earlier, using a control switch (like a standard On/Off button) is not the same as an isolation device (like a physical disconnect). Control switches are designed to manage the machine, not to

The Proper Use of Control Circuits

Control circuits are the brain of a machine, but they’re not the same as isolation points. So a control switch can interrupt the flow of power to a motor, yet the hydraulic, pneumatic, or mechanical energy stored in the system remains untouched. The key is to treat any device that can introduce energy as a potential source that must be locked out.

When you encounter a machine with a separate control circuit, follow these steps:

1. Identify the circuit’s purpose. Is it a low‑voltage control relay, a PLC input, or a safety interlock? Knowing this helps you determine whether it can be relied upon for isolation.
2. Lock the control power. If the control circuit is powered by a dedicated breaker or fuse, lock that breaker in the off position. If the control power is derived from the same source as the main power, you must lock the main source instead.
3. Verify the control circuit is dead. Use a multimeter or a voltage tester to confirm there is no voltage present on the control terminals. A simple “light bulb test” (a small lamp connected to the control line) can also provide visual confirmation.
4. Tag the control circuit. Apply a lockout tag to the control breaker or fuse, clearly stating that work is in progress and the circuit must remain de‑energized.

By treating the control circuit as an energy source, you eliminate the hidden danger of a “ghost” power path that could suddenly reactivate the machine.

Additional Pitfalls to Watch For

Even the most diligent technicians can slip up. Here are a few lesser‑known traps that often lead to incidents:

Building a Culture of Safety

Technical skill alone isn’t enough; the mindset you bring to each job determines whether the protocol is followed or shortcuts are taken. Encourage a “zero‑exception” approach in your team:

• Standardize a checklist that includes every energy‑isolation point, verification step, and documentation requirement.
• Conduct brief “pre‑task briefings” where the entire crew confirms that all sources have been identified and locked out.
• Promote open communication so that anyone can pause work if they suspect a missed source.
• Review incidents regularly and celebrate the lessons learned, turning near‑misses into concrete improvements.

When safety becomes the default, the pressure to rush disappears, and the likelihood of a catastrophic event drops dramatically.

Final Takeaway

Lockout/Tagout isn’t a bureaucratic hurdle; it’s the difference between a routine maintenance job and a life‑changing tragedy. By systematically identifying every energy source, applying physical locks, dissipating stored energy, and rigorously verifying that the machine stays dead, you protect not only yourself but also your coworkers and the equipment itself.

Remember: **confidence without compliance is a liability.Also, ** No matter how experienced you are, no matter how quick the fix seems, the only acceptable shortcut is a well‑executed lockout procedure. When you treat each step as non‑negotiable, you create a workplace where productivity and safety go hand in hand.

In the end, the goal of LOTO is simple—to make sure when you walk up to a machine, it stays down until you’re ready to work on it. Follow the protocol, stay vigilant, and you’ll turn every potential hazard into a controlled, manageable task. Safety isn’t an option; it’s the foundation of every successful operation.