MAINTENANCE personnel are at risk of electric shock from portable thread cutting machines, according to WorkSafe Victoria.
It cited an incident where a sprinkler fitter being shocked by his electrical thread cutting machine.
Investigations found the electric motor had short circuited to the machine’s metal frame because of a build-up of carbon dust and other contaminants within the winding coils.
This carbon dust is generated as the motor’s brushes wear down, while metal filings, dust and other compounds can be drawn into the motor through the cooling system.
To prevent electric shock, technicians should use only socket outlets protected by a Residual Current Device (RCD). In cases where the factory does not have an RCD, maintenance workers should use a portable RCD.
Thread cutting machine should also be tested for electrical insulation resistance and earthing continuity. Readings should be documented so any deterioration can be detected easily.
The equipment should also be maintained, serviced and cleaned according to the manufacturer’s operating instructions to control the build up of conductive materials within the motor.
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