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Morning,

I purchased an electric car and would like to install a 220V home charger. Running a new line to the box is a mess with the basement finishes. I have a 30A 220V circuit line adjacent to the garage. It is only used a couple hours a day. Is there a manual A/B type switch for 220V where I can pick the line to use? I see manual generator type switches for two inputs/one output; Could these be just wired two outputs/one input or is there something to prevent this?
Thanks.
Jerry
 

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The line from the panel that feeds the garage receptacle to plug your car (or air conditioner or table saw or whatever into) cannot be the same line that your generator sitting outside your garage can feed power back to the panel in case of a power failure. You must have separate lines for those two functions.

Note that the car charger has a working amperes rating and a branch circuit maximum amperes rating. The power plug is sized to match. Your table saw or AC unit or whatever also has a working rating and a maximum circuit amperes rating. If the working amperes rating for one is greater than the maximum amperes rating for the other (or if their power plugs differ) then they cannot share the same circuit although you can have a subpanel in the garage with separate sub-branch circuits of appropriate amperes rating for each.

(A circuit may not daisy chain to different outlet boxes with respective receptacles of different amperes ratings. Exception: A 20 amp 120 volt circuit may have both 15 amp and 20 amp receptacles provided that if there is a 15 amp receptacle there must be a minimum of one duplex or two singles of either rating on the circuit.)
 
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