This is a voltage drop question. To answer this question a voltage has to be stated.
In the US and Canada, 10 Guage wire will suffice
40 amp
here is a wire gauge calculator which will answer your questions http://www.powerstream.com/Wire_Size.htm
AWG 4 copper.
This is a voltage drop question. To answer this question the voltage of the pump must be stated
In the US and Canada, 10 Guage wire will suffice
40 amp
here is a wire gauge calculator which will answer your questions http://www.powerstream.com/Wire_Size.htm
12 AWG.
AWG 4 copper.
This is a voltage drop question. To answer this question the voltage of the pump must be stated
AWG 10 guage.
That can't be answered until you state the voltage.
Assuming its copper. Number #3 or #2 is fine
A #14 wire will do fine for grounding a 20 amp device. That is the size of the ground wire in a 2 conductor # 12 wire building cable.
This is a voltage drop question. To answer this question a voltage must be stated.
Up to about 100 ft the size of the wire is determined by the max current and not the distance. A 90 amp supply needs #6 wire. <<>> A #2 copper conductor will limit the voltage drop to 3 percent or less when supplying 90 amps for 75 feet on a three phase 480 volt system.