Compatibility with FactorioExtended Plus, I've already played with it and figure out the issue. If you would change :
advanced.lua lines 12 to:
electric2.fast_replaceable_group = "electric-furnace"
and line 64 to:
electric3.fast_replaceable_group = "electric-furnace"
This would allow both mods to work together nicely. Just wanna help out where I can.