1 Scope

1.1 These requirements cover EV plugs, EV receptacles, vehicle inlets, vehicle connectors, and EV breakaway couplings, rated up to 800 amperes and up to 1000 volts ac or 1500 V dc under conditions of continuous use. This standard applies to the devices which may also be intended for use in charging systems that provide for active cooling or dynamic current control when the device is rated only for DC voltages. These devices are intended for use with conductive electric vehicle supply equipment (EVSE), and are intended to facilitate the conductive connection from the EVSE to the vehicle. These devices are for use in either indoor or outdoor nonhazardous locations in accordance with Annex A, Ref. No. 1.

1.2 This Standard does not directly apply to any device that is not intended for use as described in 1.1.

1.3 In the text of this Standard, the term "device" refers to any product covered by this Standard. The letters "EV" refer to an electric vehicle, including plug-in hybrid vehicles, hybrid vehicles, electric vehicles, battery electric vehicles, and similar vehicles.

Summary of Topics

This revision of ANSI/UL 2251 dated December 15, 2022, is being issued to incorporate the following:

– Elimination of pin engagement lengths; 7.1.5 and 7.1.6

– Revision to the scope and increase of voltage limits; 1.1, Table 24.1 and 30.4

– Addition of option for active cooling and dynamic control of output current; 1.1, 2.1A, 2.5A, 6.1 – 6.4, 45.2, Table 45.1, 45.3, Table 45.2, Table 47.1 and 56.1.1

– Clarification of ground conductor sizing; 15.1

– Clarification of dielectric strength and humidity/isolation resistance/dielectric test series; 29.3, 30.1, Table 30.1, 30.2, 30.4 and 30.5

– Correction of metric value; 33.1

– Clarification and revision for allowance of lower ambient temperature exposure; 34.4 and 34.6

– Clarification of the test to allow the use of manufacturer's ambient temperature ratings; 35.5

– Clarification to the short circuit test; 39.1.1, Table 39.1, 39.2.6 and Table 39.2

– Editorial change to correct references; 43.4

– Temperature test clarification for products with a manufacturer's recommended ambient above 40°C; 45.1

– Harmonization of ANCE NMX-J-678/CSA C22.2 No. 282/UL 2251 and IEC thermal cycling tests; 18.3, 18.4, 45.3, Table 45.2, Figure 45.1 and Sections 54A – 54D

– Revision to the overload test; 43.1 – 43.4, 43.4A, 43.5A, 43.6, 43.7 and 43.11

– Addition of reference to UL 969A for alternate cord tag requirements; 56.1.7 and Annex A