To get the length of pvc conduit needed photo 5.
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We found one of the outlets in our house was shaking a lot more than we thought was normal so we took it apart to find the actual box was damaged.
Install proper bracing a simple 2x4 between the rafters should be fine and attach the electrical box to it.
Then mark and cut a hole for the electrical box in the soffit cover.
To get started screw a metal box extender to the outlet box.
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Hold the next outlet box in position and measure between the boxes.
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Make sure to measure and align the box properly so the box will be flush with or just protruding from the soffit.
You ll run conduit from here to the next box.