You open your post with a statement that you have a pump that has two wires and then ask the question is one make that only has two wires.
Seems to me you answered the question before you asked it.[/QUOTE
As I stated-- I know the purpose of a ground wire. This particular setup is approximately 25 years old. I did not install the pump, I noticed this absence of grounding while repairing piping. I have no idea what previous owners of property have done. A lot of unqualified people will cut the ground wire even in their home (They don't need it). I posted this same question in another forum and was advised by some that the pump was hooked up wrong, and by others that some pump manufacturers design their pumps to operate safely without ground. One person stated that their new pump was of this design, stating that the submerged pump was under water and was grounded. I am not a certified electrician and I do not know the credibality of this statement. Many people will give electrical advice that is incorrect or not to code. The only metal present at pump location is the casing cover and a gavalnized 1" 90. The well casing is plastic pipe. I am asking a qualified electrician if I can make a ground connection to the pump cover and accomplish a suitable ground or do I need to pull the pump to see if there is a ground wire.