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..and to answer you directly, to be safe all the wires that run on the 15 amp circuit, that you wanna upgrade to 25 amps will have to be replaced with new and bigger gauge. That means tearing into walls. It's just not as feasible as running a new subpanel and wire to suit. (see my previous post)So hire someone to do it? is it even possible
When people screw in a bigger fuse than what the circuit is wired for, they risk a house fire.