CCS1 and CCS2 are electrically identical. I'm not sure why you think something to do with a non-CCS compatible Model X has anything to do with that.Please look them up before posting, They are NOT electrically the same. The EU CCS-2 adapter is more complex than that, and earlier than IIRC 2018 Tesla models required a physical update to accept that adapter. A Model X I drove in Europe back then had the update scheduled but not installed when I drove it.
Just like the CCS1 to NACS adapter is passive, the CCS2 to Tesla Type 2 adapter is passive. But for an older EU spec Tesla to be able to use that adpater it required an ECU to be put inline so that the vehicle could talk CCS.
So yes, if the person could use the Tesla CCS1 adapter in North America, they could use the CCS2 to NACS adapter that that person linked to so that they could charge a NA spec Tesla in Europe at CCS2 chargers.
No, CCS2 does not include AC charging. That would just be using the Mennekes Type 2. I'm pretty sure that the CCS2 spec states that the AC pins must not connect to anything, in fact it says that CCS2 plugs can't have the AC pins. From: Combined Charging System - WikipediaCCS-2 includes the Type 2 connector. CCS-2 includes both AC and DC. That separation between Ac and DC in CCS is exactly why all CCS is so cumbersome.
For Combo 2 the AC contacts (L1, L2, L3 & N) are completely removed from the connector and therefore the Type 2 portion of the connector has only three contacts remaining – two communication contacts and a protective earth. The vehicle inlet may retain AC contacts to allow non-CCS AC charging.
So note that a car with a CCS2 inlet doesn't have to support AC charging at all. It can, but it isn't required because that isn't part of CCS.
Just like in NA, CCS1 is DC Fast charge, with a partial J1772 connector on top. But it can't AC charge. For that you have to use a J1772 connector/protocol.
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