I recently installed a new receptacle which will be the only item on a 20 amp circuit. For variety of reasons (not wanting to carve into finished walls or ceilings, or foundations), I decided to not take the shortest route from the panel to the receptacle, but are rather use cables I had put in place years ago, unused, just in case I wanted to add something to a circuit or create a new circuit. The result is that from the panel to the receptacle, there is a run of approximately 80 feet of 12gauge wire. Will this length of cable compromise the performance/safety of the receptacle? The largest (and only) draw on the circuit would be a 1500 watt space heater. Thanks in advance.

to many things were plugged into the circuit. The power to the circuit went out, at least partly. One bedroom with three receptacles, light switch, and bathroom lights, receptacle, and switches are out. The kitchen and garage lights (on the same circuit) still function. ALL of the receptacles and switches get power, however, nothing will work when plugged in. I have replaced the GFCI outlet twice thinking the first two were bad (they might have been). Now have a standard 2 outlet receptacle in place. I could use a little help in determining the problem. Thank you!