We used a single gang to 4 in.
Installing gang box on metal roof.
Cut the conduit and glue male adapters to each end.
To get the length of pvc conduit needed photo 5.
To get started screw a metal box extender to the outlet box.
Then mark and cut a hole for the electrical box in the soffit cover.
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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.
Hold the next outlet box in position and measure between the boxes.
You ll run conduit from here to the next box.
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Install proper bracing a simple 2x4 between the rafters should be fine and attach the electrical box to it.