For single phase 30 amps at 120 volts you would need a #8 copper wire with an insulation rating of 90 degrees C.
This is a voltage drop question. To answer this question a voltage must be stated.
Assuming you are working with 120v, you need #4 AWG copper conductors.
This is a voltage drop to establish wire size question. For a correct answer to this question two values are needed. One value needed is the voltage and the other is whether it is three phase or a single phase installation.
A 100 foot fish tape and wire lubrication will be needed to make this wire pull.
The wire size depends on how much current it will conduct.
Use AWG #10 wire on a 20 amp breaker.
10 AWG in copper.
To calculate the wire size, a system voltage is needed.
If this question is asking about voltage drop, to size a wire, a voltage is needed.
A #3 copper conductor will limit the voltage drop to 3% or less when supplying 5 amps for 1500 feet on a 120 volt system.
This is a voltage drop question. To answer this question a voltage must be stated.
You know the old saying: "If you have to ask..."! If you're asking this question, you should probably be calling an electrician. The answer to your question depends upon what you are trying to power up. This will determine what size wire you will need and therefore, the size of the circuit needed.
Assuming you are working with 120v, you need #4 AWG copper conductors.
# 6 copper wire.
This is a voltage drop question. To answer this question a voltage has to be stated. The higher the voltage to the circuit becomes the smaller the wire size needed. After a certain voltage point the wire size will remain constant and the voltage drop at the load will become smaller.
8 gauge will be sufficient with less than a half volt drop
To answer this question the voltage and load amperage is needed.