Gregory's Serveranother angle. the smaller wires are used to negotiate the charging parameters.
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 another manufacturer uses these connections and color codes. their cable has fewer wires but the blue/brown color code for the large conductors confirms that this cable is for NACS which can handle either AC or DC. I doubt the center is the safety ground, it's clearly not green/yellow (one of the tiny ones are) and all it has to do is deliver potential but no current. The slightest current in that wire, and everything trips off instantly. My best idea is that it is a "neutral" intended to balance the two load-bearing circuits symmetrically around "ground" potential. That would mean relevant but not full-load currents, which again precludes it from being also protective ground. But I think it also has a machanical role, possibly preventing the cooling channels from collapsing during mechanical abuse. @tubetime is S1 the button that operates the radio transmitter for opening the charge port cover?
[DATA EXPUNGED]
 @tubetime are those channels hollow for cooling or something else? maybe optimization for skin effect but this is probably dc stuff. |
it's tough to find information about the extra wires in the cable.
the center conductor is probably the safety ground (earth).
one pair of wires would be the "metering" connection which monitors the voltage at the DC output contact pins (remote sensing).
two more wires for PP (proximity pilot) and CP (control pilot) connections.
the remaining wires may be for thermistors that sense the temperature at the plug and within the cable.