EPAC or Pedelec is a term used for bikes that meet the EU regulations, assist should cut off beyond 25kph (15.5mph) and you only get power when you cycle. I think there's a motor wattage maximum too so that might help your search.
And the great bit is that if you are ignorant of these laws and get caught on an electric bike doing higher speeds then you get a penalty as if you are riding a motorbike without insurance or a license - aka penalty points on your regular driving license, plus all the other court shenanigans.