I am wiring up a greenhouse that we built. I have installed 2 - 20 amp GFCI breakers and will use 12 guage wires. Because everything is in conduit I am trying to minimize wires. Here are my circuits: 1- recepticles on a timer switch for grow lights (about 1000 watts) 2 -(a)Exhaust fan and shutter motoers on a thermostat and reosatat (about 500 watts) & (b)additional recelpticles for possible heating pads I am in the process of planning my wire pulls. I am using 3 wires Black (hot), White (neutral), Green (ground). Main conduit runs overhead and drops down to various recepticles and stuff. I would like to splice off the green and whites and run down to the recepticle but not back up to the main conduit. The black will go down and back up. (hopefully I have painted a picture). My qusetion is this going to create an inbalance for mu GFCI?