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Lock Out and De-energise

Updated: Dec 20, 2021

Lock Out and De-energise
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Using Lock Out and De-energising procedures are important to complete to ensure machinery or equipment maintenance work can be completed in a safe manner and avoid serious injuries to workers.

Machines and equipment that have not been Locked Out or de-energised can

often unexpectedly start when work is being completed. They can start from

someone accidentally starting them up or energy remaining in the machine or


What is Lock Out and De-energisation?

Lock Out and De-energisation must be done in combination to effectively

prevent the release of energy that could potentially cause injury.

Lock Out refers to using lock(s) to isolate an energy source or to ensure

machinery or equipment is inoperable. When applying Lock Out, each worker

involved in the work must be applying a lock and hold onto their individual key,

while maintenance is carried out. This way the machine or equipment cannot

be restarted before every worker is made aware of the intent to un-lock

and reenergise the item.

De-energisation means removing the energy from machinery or equipment and

testing the item to ensure no energy or pressure remains and it is unlikely to

restart itself during maintenance work.

Steps for Lock Out and De-energisation

Restoring and Unlocking

Once work is completed and the locks have been removed, energy to the

machinery or equipment can be restored it is best practice to complete a test

run of the item to ensure that the machine or equipment is functioning as it

should before handing the item back to workers.

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