per http://en.wikipedia.org/wiki/American_wire_gauge, 18 AWG has 20.95 Ω/km. 600'=183m=0.183km. 20.95 Ω/km *0.183 km = 3.834Ω.
This is a voltage drop question. A 500 MCM copper or 750 MCM aluminium conductor will limit the voltage drop to 3% or less when supplying 300 amps for 500 feet on a 240 volt system. Paralleling these conductors will allow the rating to be increased to 600 amps.
You can run it as far as you want, knowing that the farther you go, the more voltage drop will occur under load. If you have a very small load, you can run 14 AWG for hundreds of feet.For instance, 14 AWG copper THHN 90C in conduit with 3 percent voltage drop would get you over 600 feet at 1 amp, but only about 50 feet at 15 amps.
600 Volts
A 350 MCM copper conductor with an insulation factor of 75 or 90 degree C is rated at 310 and 325 respectively. So depending on the insulation of the wire that is used, a parallel wire configuration will give you a total of 620 at 75 degrees C or 650 at 90 degrees C.
Use the general equation for resistance in parallel: 1/R = 1/R1 + 1/R2
It is: 600 square feet
600*5280=3,168,000 feet
Assuming the allowed volt drop is 5% or 5.5 volts, the wire resistance has to be 5.5/15 ohms or less, 0.367 ohms. The total length of wire is 600 metres so the resistance per metre is 0.00061 ohms. 1 sq-mm copper wire has a resistance of 0.0168 ohms/metre so you need wire with a size of 0.0168/0.00061 sq-mm, or 27.5 sq-mm. The next size up is 35 sq-mm in European cable size, or #2 AWG in America.
600 meters = 1,968.50394 feet
1). You don't need the voltage 'E' in order to calculate the total resistance. The totalresistance is the same whether the circuit is connected to a big battery, to a smallbattery, to a bicycle pump, or lying in the back of the desk drawer.2). In a series circuit, the total resistance is just the sum of the individual resistances.In this example, the total resistance isR1 + R2 + R3 = 100 + 500 + 600 = 1,200 ohms .
To convert from feet to meters multiply by 0.3048 600 feet = 600 x 0.3048 meters
There are 5280 feet in one mile. Therefore, 1 mile 600 feet is equal to 5280 + 600 = 5880 feet.
600 millimeters = about 2 feet.
600 feet = 182.88 meters.
600 feet = 182.88 meters.
600 feet is 200 yards.
600 feet = 0.113636364 miles