Royal Melbourne Hospital

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The Royal Melbourne Hospital is a large public hospital with over 500 beds and a significant teaching component.


Harmonic interference was detected in close proximity to the ECG equipment in the new outpatients wing.

This interference put the ECG test results into question and caused the ECG test area to be temporarily closed.​


Part of the hospital and an important patient service, was closed.


Initially we carried out a power quality audit.

We found that the ECG interference was coming from the main supply cable which carried a high level of third harmonic current

2 x 100 amp Active Harmonic Filters were installed and programmed to eliminated the third harmonic pollution.


The hospital was able to reopen the ECG test area and continue its important, lifesaving work.

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