Depends on how much is flowing into the pipe. One bathroom sink, 1 1/4"
Minimum 3/4" pipe.
Pipe bore is the actual minimum inside diameter of a pipe, which is not necessarily the nominal pipe size.
3/4
It should be 3" minimum, preferably 4.
1/4" as this is the actual size of the supply connection as the water must pass through the faucet seat.. The spout size can vary from 1/2' -1" depending on make and model and year
The size of the water pipe from the meter to the house should be determined based on the water flow rate needed for the house. It is recommended to consult with a professional plumber to determine the appropriate size of the water pipe for optimal water flow and pressure.
3" pipe usually, but local codes may specify 4".
1/2" water lines. Drain line determined by flow rate of showerheads and bodysprays being used. 5.7 gpm or less flow rate would need 1 1/2" drain, which is minimum size allowed.
The wire used to ground a water pipe typically needs to be a minimum of 10 AWG copper wire. It's always best to consult with local building codes or a licensed electrician to ensure that the proper size wire is used for grounding.
Normally 11/2" DEPENDING on developed length of piping and fittings
If you are increasing pipe size it means lower friction loss and possibly more pressure and flow if available from the supply.
24".