In almost all cases, the potential to damage a material (a particular type of plastic, or a paint, etc.) with any particular liquid solvent depends on the chemical interactions of the two materials. Ethanol and iso-propanol are two VERY closely realated solvents that have VERY similar interactions with other materials. So if the plastic insulation of an electrical cord can stand up to iso-propanol, it certainly can stand up to ethanol as well.
In fact, the reason that iso-propanol is so widely used for this purpose is somewhat the opposite of what you have found in trying to buy stuff. In many countries distribution of ethanol is restricted because of possible abuse by drinking it - it is the only alcohol that humans can drink without...