![]() The conduit size should be able to carry 325 amps. So, if your run is 150 feet, you’ll need to increase the amperage of the wire by 30. Outdoor circuits, however, are often quite long and the voltage drop can be significant. 200 amp x 100 / 80 250 amps (to account for the 80 rule) Next, determine how long your wire run is. ![]() Voltage drop occurs in any wire run, but it is rarely a problem with indoor wiring, where the distance from the circuit breaker panel to the end of the circuit is usually relatively short. However, if the cable run is long, as underground runs often are, you may need to increase the wire size to account for voltage drop-a loss of voltage in the circuit caused by the natural resistance in the wires. Sizing the wires, or conductors, for an underground cable is no different than sizing for other household circuits and is typically based on the total load, or electrical demand, of the devices on the circuit. But the voltage drop will be a bit higher than 3. You can alternatively use two 6/0 AWG cable in parallel. To be exact you will need 4 parallel wires to complete the job keeping the voltage drop within 3. ![]() Such an installation is typical when running a circuit to an outdoor location, such as a garage, shed or other outbuilding, or to a yard light or water feature. What Size Wire To Run 500 Feet 200 Amp To run a 500 feet 200 amp you will need a number of 4/0 AWG wires in parallel. Underground wire for a residential circuit usually is installed with underground feeder (UF) cable, which is rated for outdoor use and direct burial.
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