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I would look at the National Electric Code before starting on a 50 amp installation, regardless of state.
 
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I am in california, just wondering if there is any regulation around installing my own switch or upgrading one if it exists in the garage already?
Just know that you can do the work without pulling a permit, but it may be an issue if you later sell the house...

I did a DIY installation on a 48A EVSE hardwired (6ga w/ dual pole 60A breakers) myself but had my electrician friend do the actual 240V line connections as I am afraid of anything higher than 48VDC that I normally handle...

He even measured the wattage & temps on the incoming 240v and outgoing 240v just to make sure the unit was able to pump out a full 11kW without heating up.
 

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From a search:

Can a homeowner do their own electrical work in California?
A property owner may do electrical work on his own property; B. A homeowner or a member of his immediate family may do electrical work on his residence. 070 – California Electrical Code—Amendments—General.
Just make sure it meets code at the time you do the work.
 
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