The fittings are a PVC female adapter glued on the PVC with an EMT connector screwed in. De-rating is not a factor as each of these 3/4" conduits are for one set of conductors each. They are for dedicated circuits for special equipment and the 3/4" conduits will have (4)#10 THWN and the 1" will have (3) #8 and (1) #10 in it. All other conduits/circuits will be overhead runs. There are (2) more panels to be mounted above the gutter. The feeders from the 400A MDP will run through the gutter to DP1 and DP2. The panels and gutter are mounted on a wall with 1" OSB and (2) layers of 5/8" sheet rock between them and the stud faces. The EMT from the PVC to the gutter measures 26".