@ZenPunkHippy @elektrol thanks for chiming in! i will see which psu is easier to locate here in Canada.
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Check whether it generates hum / a ground loop.
My Top Chargeur 5V, 4A is therefore unusable for the Overhub in my special setup. 
Does anyone in Sweden have a tip for a PSU that works for Overhub that I can find on amazon.se, kjell.com or similar site?
I’ve been using powered StarTech USB hubs with Overbridge with no problems.
They’re more expensive but if you need a high-speed hub like the Overhub with industrial power, this is the best I’ve found.