As the EV market expands, there’s a pressing need for more standardization of DC power distribution, especially for buses and heavy-duty vehicles. SAE International’s new standard SAE J-3105: Electric Vehicle Power Transfer System Using Conductive Automated Connection Devices Recommended Practice promotes the safe testing and performance of mechanized conductive power transfer systems, primarily for vehicles using a conductive automated-charging device (ACD).

SAE J-3105 addresses three interfaces required to ensure power delivery is consistent. It defines a conductive power transfer method, including the curbside electrical contact interface, the vehicle connection interface, the electrical characteristics of the DC supply, and the communication system. It also covers the functional and dimensional requirements for the vehicle-connection interface and supply-equipment interface.

In addition to the main document, there are three supplements, which address connection-interface requirements for power transfer systems based on cross-rail designs, conventional rail vehicle pantograph designs and enclosed pin and socket designs.

“SAE J-3105 will help industry ensure that each connection type is safe and interoperable among manufacturers,” said Task Force Committee Chair Mark Kosowski. “The industry has been waiting for this Recommended Practice”

Source: SAE