Underwriters Laboratories has developes a set of requirements for indoor/outdoor cord sets for electric vehicles.
Cord sets establish an electrical connection for the purpose of charging electric vehicles at home or at public charging stations. Product safety testing will include stationary and portable cord sets, including the attached plug, flexible power cord, personnel protection circuitry, electric vehicle cable and vehicle connector. Electric vehicle components that bear the UL Mark are tested for overload protection, shock and flammability.
The future standard, UL Subject 2594, will comply with National Electric Code Article 625.