240 Volt Outlet - Guide to Plugs,Prongs, Receptacles and 240 Volt Outlet Where to Turn for Easy 240 Volt Outlet and 240 Volt Plug Wiring Solutions.An electrical problem involving a 240 volt outlet,a 240v single phase plug, or 240 volt plug wiring is not something you can ignore.Besides being a major inconvenience,there is a marked fire hazard,and it can quickly develop into an emergency situation. A 240 volt outlet supplies two times more power than a 120 volt appliance.AC Plug Less Than 15 W AC Plug 20 W – Up to 30 W AC Plug 30 W – Over 30 W AC Plug Over 30 W How to plug an appliance into a 240v outlet A power plug for 240v appliances. Larger home appliances,such as electric ranges,dryers and some air conditioners, use a 240-volt supply rather than the usual 120 volts.Installing an outlet for these appliances is no more difficult than than installing a standard 120-volt wall outlet.