Long before I began inspecting in this area and throughout my term, it has been the practice on Mobile Homes for HVAC installers to supply the circuit to the condenser unit from the interior panel of the mobile home using a conduit stubbed from the panel by the manufacturer. The installers have been using UF to the exterior disconnect with the wire fished above the vapor barrier under the frame. This appears to be a violation of 550.15(H). What is the practice in your area ?