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I installed the 30 amp unit last fall. Install was about 45 minutes. My TT has a junction box in a cabinet where the power cord comes in. I simply removed it and inserted the surge unit in it's place. Mine mounted to the floor which is carpeted so I've noticed no hum. It did however trip when I first plugged the TT in to shore power. Error codes showed reverse polarity. Opened it back up and everything was connected correctly. Powered back up and it again tripped out. Checked the homemade extension cord I was using and surprise, the plug end was incorrectly wired. Correcting that fixed the issue and this unit has already saved me once for an under voltage situation. Great investment.
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