This Fourth Edition of the Standard for Plugs, Receptacles, and Couplers for Electric Vehicles, UL 2251, is being issued to incorporate the following: Revised Product Designations Clarification of Scope and Products Not Covered by UL 2251 Addition of New Definition for Grounding/Bonding Conductor Clarification to Ratings and Required Designation of Ratings Clarification of the Fused Devices Requirement Clarification of Cable Requirements for the Impact Test Revised Requirements for Metallic Enclosures Revised Requirements for Pollution Degree Revision to the Temperature Rise Test New Requirements for Device Configurations in Relation to Pin Lengths and Speed of Disconnection Reinstatement of the Overload Test Conditions for Connectors "Not Intended for Current Interruption" Revision to Address the Environmental Rating of Internal Parts Removal of National Differences for Canada