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Have a larger electrical box installed.

assuming the utlity company ran 4/0,4/0, and a 2/0. You need to upgrade the service to 3/0 cu wires or 4/0 al (which will be cheaper and lighter to install than cu) . Upsize the panel to a 200 amp, and obviously change out the 150 amp breaker. All conduits would have to be looked at and and the panel bassically reassembled ( hooking up all the breakers again). The ground wire needs to be changed to a bare #4 copper

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Q: If you have 150A service in your home and want to upgrade what do you need to do to get 200A?
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