you will need wiring that is at least 10 amp rated wire or higher. If you really needed to ask you might want to call an electrician Electrician here, be the pump 120 volts or 240 volts a #14 wire will handle the situation. Longer runs of 75 feet you should go to a #12 wire to compensate for voltage drop. The pump should be on its own separate circuit with a 15 amp breaker. A two pole 15 amp breaker if the pump is 240 volts.
3/0 gauge
Use 8 gauge wire.
AWG #6
2 AWG.
At the service entrance you will need AWG 1/0 gauge.
Yes. Check local electric codes to see if a disconnect is required at the sump pump. One way is to wire a single 15A circuit to an outlet for sump pump. Then the disconnect is just to unplug the pump for service.
It is the ground wire for the fuel pump. The Red wire is the power wire for the pump. the dark blue is the signal wire for the gauge and the black is the ground for the gauge.
3/0 gauge
Use 8 gauge wire.
Wire gauge is used to determine the size wire needed to carry the correct amount of current for the job. It must be sized appropriately for the current in the circuit you are building.
4 gauge
The guage of wire for 20 amps is #12 copper.
AWG #6
2 AWG.
10 AWG.
At the service entrance you will need AWG 1/0 gauge.
My heat pump was professionally wired when built in 2004. Wire is No. 4 AWG with 80 amp breaker