The minimum size you can use is 3/4 conduit. The code allows for a maximum of 4 each # 6 gauge wires in a 3/4 inch pipe. You'll likely be running 3 ea # 6s, two hots and the neutral and a #10 ground wire.
No, the conduit has to be supported individually from a supportive structure. The spacing of the strapping is related to the size of the conduit.
For new 200 amp services the conduit size should be 3 inch PVC.
A trade size hole for a 2-1/2" EMT conduit connector, the hole needs to be 2-7/8" in diameter. A 3" rigid conduit can also use this size hole without the lock nuts falling into the hole.
Back set for all conduit sizes is not the same. The greater the diameter of the conduit the length of back set increases. Without the diameter size of the conduit, an answer can not be given.
Need to know the wire # size to compute wire fill in conduits
No, the conduit has to be supported individually from a supportive structure. The spacing of the strapping is related to the size of the conduit.
The same size as the pipe it is hooked up to in the well.
Depends on the diameter of the conduit. Try for 1/4" larger diameter drill bit.
4 inch rigid conduit
The sizing of conduit systems that wire has to be pulled into is dependant on the physical size of the conductor being drawn into the conduit. The second governing factor is the conductor count of the specific conductor that is needed. A 500 MCM copper conductor with an insulation factor of 90 degrees C is rated at 430 amps. This is where the conductor count is need by the service, as to whether the service is single or three phase. In this specific case, the electrical code will allow both single and three phase installations to use the same size conduit. A maximum total of four 500 MCM conductors can be drawn into a 78 mm diameter conduit.
4 inch rigid conduit
Actual hole size for 1 inch conduit is 1.362"
Conduit is sized by the number of conductors that are being pulled into it. The conduit size of 1/2" will allow one #4 wire to be pulled into it. 3/4" will allow 2 and 1" will allow 4 #4 conductors to be pulled into it.
The size of conduit is based on the size of the wires in it. The size of the wires depends on the load connected in the house. Without these other two values an answer can not be given.
120mm
For new 200 amp services the conduit size should be 3 inch PVC.
a 400 watt 2 channel amp should do fine. all you need to do is bridge the sub when it is being hooked up