I am thinking no way - but figured I should ask the experts. I have some new #8 NB cable I want to run to a irrigation pump for 70 feet. This conduit will be under an existing wood deck (i.e.outdoors) but above grade. To complete the 140 foot run to the pump, I would add a junction box and convert the wire to #8 THWN and a #10 THWN ground wire as the remaining run of wire will be underground. Would this fly with the inspector?