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Like the others are saying, in your case I think you are chasing a ghost.
Ground loops occur when you have multiple ground points and differentials voltages between those points.
If you only have one power source ie one 240v circuit to your obs, then you would generally only have one ground point.
Once you have two or more power sources ie 240v + battery, or 2 x 240v circuits with different longs lengths of cable (ie greater than 50m difference), then you have different beast to deal with.
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