I need a little help citing the proper article, and paragraph for temporary power over 90 days. I have construction trailer being fed 120/208-volt 100 amp in a 1 1/4" PVC run along a fence line above ground being fed from an existing building approx. 75'. It has been this way for well over a year and half. Regardless of the power source, if it's a transformer, or an existing building can PVC be left above ground, or does it need to be in the ground? Please let me know if RGS above ground is acceptable means. Thanks