LeftieBiker wrote:LeftieBiker wrote:
replacement of the existing cable with 240 volt cable.
Why is that ? I thought 240v is just 120v * 2. Or did you mean a 4 wire run ?
240 volt cable has three wires (two Hots, one neutral) plus the bare ground wire. Devices that don't use Neutral are uncommon enough that you generally either cap the Neutral in a hardwired EVSE installation, or install a 4 wire outlet that can be used by other devices, with the Neutral unused by the EVSE plug. That way the whole cable doesn't have to be replaced if the EVSE is replaced with something that needs a Neutral. If you know that only an EVSE will ever occupy that circuit, then you can use two wire (plus ground) cable of the correct gauge.
Almost ALL 208-230V home wiring that's 20+ years old is only three conductor(wire) configuration. Pure 208-230V loads don't utilize a neutral at all.
The vast majority of current 4 wire 208-230V wiring adds a neutral wire because a portion of the attached load has a 120V component thereby necessitating a separate neutral wire.