Due to the fact that new fueling/charging technologies are continuously being developed and adopted by the marketplace, the requirements for LEED SSc4.3 Option 2 have been forced to evolve over time. The latest direction, of which I am aware, was provided through the NCv2.2 CIR Ruling dated 3/10/2009, which states that 120V electrical outlets alone do not meet the intent of the credit, but 240V capabilities would also need to be provided. The intent is to offer alternatives that service a broader range of vehicles and charging requirements. The logic for this ruling might also be applied to the J-1772 type connectors in that those drivers that require quicker charge times might rely on a 240V charger, whereas other drivers may prefer to charge their vehicles overnight, therefore a 120V charger may be preferred.