Answer:

This cannot be answered simply as it depends on the specific circumstances of each case. If there are significant phase imbalances in the property, it may be possible to reduce the size by one or two steps. 

If you have a Ferroamp-system and the EnergyHub have been measuring your property you can do a analysis in the portal under "Fuse analysis". Read more here. 

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If you need to get in contact with Ferroamp's Technical Support or if you have any questions about the system, you can do so by creating a ticket here.