You will need a grounded and dedicated 15- or 20-amp AC breaker, if using 120V dedicated line, serving a grounded three-prong outlet for proper charging. Failure to have a dedicated line, other appliances on the line, using an extension cord with the charger, using a surge protector, or adding a timer and other adapters can result in electric shock, fire and/or repeated breaker trips. Contact a professional licensed electrician for proper installation of a dedicated 120V or 240V line.