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How do you upgrade a 30A outlet to a 50A outlet can I just change the outlet and upgrade the circuit breakers?

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NO! STOP! DO NOT DO THIS! More than likely the wire in the wall is only rated to carry 30 amps. Running fifty amps through it will start a fire! You MUST upgrade the wiring in the wall to upgrade the current rating of the circuit! The wire in the wall must be properly sized. Go out and buy a book. You are on the fast track to a house fire. Buy a book and read up on wire sizes, current ratings, and why they matter. Remember, negligence is fatal with electricity. ANSWER
Before you can know that you only need to change the outlet and the breaker you must make sure that the wire already in the wall is equal to, or heavier than, the size required to carry 50A safely. So calculate the wire size needed to carry 50A for your length of run and check the gage of the wire in the wall. If the wire is lighter, you must run new wire of the correct size.

If you do this work yourself, always turn off the power at the breaker box/fuse panel BEFORE you attempt to do any work AND always use a meter or voltage indicator to insure the circuit is, in fact, de-energized.
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