What do you mount an outdoor electric box to when it's not near your house?
My 240v stuff is all nailed to a flammable box, which I live in. - A 4&quot;x4&quot; should be fine. Use any visually acceptable piece of painted wood, vinyl, or painted metal; you don't need a bespoke &quot;240v box post&quot;. Use a large radius bend between the horizontal underground run and the vertical, attach the vertical conduit to the post, and pour concrete around both post and conduit. This will constitute a permanent installation.