1) The National Electrical Code recommends that the voltage drop be limited to a maximum of 3%.
2) If installing a 20 amp/120 volt circuit @ 200 feet using aluminum conductors, this results in installing 4 AWG type XHHW rated insulation with a 2.8% voltage drop or a loss of 3.4 volts. Aluminum conductors will be more cost effective than copper.
3) If installing a 20 amp/120 volt circuit @ 200 feet using copper conductors, this results in installing 4 AWG type THWN rated insulation with a 2% voltage drop or a loss of 2.4 volts.
4) NM Romex cable is not rated for exterior and/or underground conditions as this will result in a code violation. If this is an underground install, grey electrical PVC, Sch. 40 conduit is recommended. Minimal burial depth below final grade is 18 inches. If the load at the end of the exterior run will contain receptacles, they must be GFCI protected.
5) The 20 amp circuit will require 3 conductors......ie.... 1 hot, 1 neutral and 1 equipment ground.
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