No shortcuts
Never bypass an isolation, defeat an interlock or remove another person's lock.
Level 1 · Free · Self-paced
Energy Isolation and LOTOTO Awareness
Recognise hazardous energy and understand why shutdown, isolation, locking, tagging and verification are separate steps.
0% complete
Training boundary
This awareness course does not authorize you to isolate equipment, apply or remove locks, test electrical circuits, or perform maintenance. Follow your employer's equipment-specific procedure and use trained, competent and authorized people.
Hazardous energy is more than electricity
Equipment can contain electrical, mechanical, hydraulic, pneumatic, pressure, vacuum, gravity, thermal, chemical or process energy. Springs, capacitors, rotating parts, raised loads and trapped fluids can retain energy after a machine stops.
A stopped machine is not necessarily isolated. A stop button, software command, interlock or emergency stop controls operation, but may not physically separate the equipment from every energy source.
Tap or drag through the nine kinds of hazardous energy.
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Electrical
Live conductors, and also capacitors, which can still hold a charge after the supply is switched off.
Mechanical
Rotating shafts, flywheels and springs can keep moving, or snap back, after a machine stops.
Hydraulic
Pressurised oil in hoses and cylinders can still move a ram, or spray out, after the pump is off.
Pneumatic
Compressed air in lines and receivers can still move cylinders and clamps once the compressor stops.
Pressure
Trapped steam, gas or liquid under pressure can release suddenly when a line or fitting is opened.
Vacuum
A line or vessel under vacuum can suck in air, liquid or loose items, or collapse inwards, when it is opened or vented.
Gravity
Raised loads, suspended parts and anything that can fall or slide once its support is removed.
Thermal
Hot or very cold surfaces, such as steam lines, can stay dangerous long after shutdown.
Chemical
Hazardous substances in pipes and vessels that can leak, react or ignite when equipment is opened.
Ask one practical question
What could move, flow, fall, rotate, heat, cool, pressurise or become live while someone is working? The isolation plan must address each credible source, including energy that may return or build up again.
Try itA conveyor has been stopped with its emergency-stop button so a fitter can clear a jam. The fitter says, "It's stopped, I'll be ten seconds." What do you say?
An emergency stop controls operation; it doesn't physically separate the conveyor from its energy sources. A reset, a fault or a colleague can restart it, and stored energy can still move the belt.
Right. Ten seconds is all it takes. Every credible energy source has to be isolated, locked, released and tested before anyone reaches in, however short the job.
This still relies on a control device, not isolation, and on the fitter reacting faster than the machine. The procedure exists because that race is lost too often.
The LOTOTO sequence
Companies use terms such as LOTO, LOTOTO and energy isolation. The exact procedure belongs to the employer. A sound sequence normally includes:
1. Prepare
Prepare and identify the equipment, work and energy sources. You cannot isolate a source you have not found, so list every credible one first.
2. Shut down
Shut the equipment down in a controlled way. A controlled stop avoids sudden releases and tells everyone affected that work is about to start.
3. Isolate
Operate the approved isolating devices for every source. Separate the equipment physically, not just with a stop button or a software command.
4. Lock and tag
Apply locks and tags under the site procedure. Each person's own lock keeps the isolation in place while they are working.
5. Release stored energy
Release, discharge, block or restrain stored energy. Springs, capacitors, raised loads and trapped pressure can still hurt after the isolation is made.
6. Verify
Try, test or otherwise verify that the isolation is effective before work begins. Only this step shows the equipment has reached the safe condition the procedure requires.
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The final try or test is not paperwork. It checks whether the equipment has reached the safe condition required by the procedure.
US OSHA and the EU legal framework
United States: OSHA 1910.147 and 1910.333
In the United States, OSHA 29 CFR 1910.147 covers hazardous-energy control during servicing and maintenance where unexpected start-up, energisation or stored-energy release could injure people. Electrical work also has specific requirements in 29 CFR 1910.333. Equipment that is switched off but not locked or tagged must be treated as energised under that electrical rule.
European Union: the directives
In the European Union, Directive 2009/104/EC requires work equipment to have clearly identifiable means to isolate it from all energy sources. The Framework Directive 89/391/EEC sets wider employer duties for risk prevention. Member States implement EU directives through national law.
What EU-OSHA is, and isn't
EU-OSHA supplies research and guidance. It is not the inspectorate and does not issue a single Europe-wide lockout regulation. Your company must identify the national law, regulator guidance and site procedure that apply where the work takes place.
Your role around isolation
An authorized employee performs energy control under the employer's procedure. An affected employee operates equipment or works in an area affected by the shutdown. Job titles differ, so check the definitions used at your workplace.
Keep clear
Keep clear of equipment being serviced and respect tags, barriers and instructions.
Report straight away
Report damaged devices, missing locks, unclear labels or unexpected movement immediately.
Stop if in doubt
If the isolation appears incomplete, stop and contact the authorized or competent person.
Group work, shift changes, contractors and temporary energisation for testing need specific controls. Do not improvise them.
Try itEnd of a night shift: a padlock and tag are still on a valve you need to open. The job looks finished and the person named on the tag has gone home. What happens next?
Removing another person's lock is exactly what the procedure forbids. "Looks finished" is not verification, and the person may still have equipment or people inside.
Right. Most sites have a controlled process for this: the lock owner is contacted, the equipment is checked, and removal is authorised and recorded. Your job is to stop and report.
A lock belongs to the person who applied it. Anyone else removing it, even with good intentions, defeats the protection it gives that person.
Official sources
Final assessment
The assessment draws ten shuffled questions. Complete all lessons and score at least 80%. The English certificate confirms course completion and the recorded knowledge score. It does not authorize energy-isolation work.
Question 1 of 10