Well Pump Wiring

Discussion in 'Electrical Forum discussion & Blog' started by Giles, Nov 22, 2008.

  1. Giles

    Giles Retired tool & Die and Mechanic

    Messages:
    112
    Location:
    N.W. Alabama--Florence--
    I have a submerged well pump that has only two wires connected. One is red and the other is black. This is a 220v setup, and there is no ground connection or a white wire from the pump for connection. I have found conflicting information as to the use of a ground wire application for well pumps.
    My main concern is safety and I appreciate the importance of a ground in ALL electrical applications. Is this safe or do some well pumps have this type hookup?
  2. jwelectric

    jwelectric Electrical Contractor/Instructor

    Messages:
    2,532
    Location:
    North Carolina
    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.
  3. Giles

    Giles Retired tool & Die and Mechanic

    Messages:
    112
    Location:
    N.W. Alabama--Florence--
  4. jwelectric

    jwelectric Electrical Contractor/Instructor

    Messages:
    2,532
    Location:
    North Carolina
    First let me make this statement.
    If you are there to do repairs on the plumbing then please don’t try to cross over into the electrical. If you have doubts as to the compliance of the electrical then simply call an electrician for help.
    In some states you are required to have an electrical license in order to make even a grounding connection. In these states you could be treading on some liable grounds if you should decide to ask a bunch of questions on a DIY web site for information on something you have no idea about.

    A lot of 120/240 volt submersible pumps will not have an equipment grounding conductor simply due to the fact that no one will be climbing down in a well to touch a submersible pump, then again we just don’t know about these things as I am sure the world is full of people that are not but 6†around.

    Should this submersible pump be installed with metal piping down the well then there might be some danger of the pipe becoming energized and something there would need some sort of bonding but I haven’t seen any pumps that were installed with metal pipe. Most of what I have seen was installed with some sort of black nonmetallic pipe that wouldn’t conduct current therefore no need to ground something that no one could touch even if they were only six inches in diameter.

    Concerning the well cap and the galvanized nipple chase I think you have answered your own question again in your opening statement, “As I stated-- I know the purpose of a ground wire.†If you truly know the purpose of the ground wire then why ask?
  5. speedbump

    speedbump Previous member

    Messages:
    4,540
    Location:
    Riverview, Fl.
    Submersible pumps that had two wire or three wire motors didn't have a ground wire until the National Electrical Code was changed back in the 90's I believe. Then the green wire was added to all submersible pump motors regardless of whether they were three or two wire motors. Since only two wires were needed to make a 230 volt connection and make a motor run, the third (or fourth in a three wire motor) wire wasn't needed to make the motor run. Now that wire since being added by the NEC is seen on all pump motors.

    Since your pump is that old, I wouldn't worry about adding the third wire. The pump will probably be dying of old age soon anyway. And there were a whole bunch of sub motors out there without that green wire that didn't hurt anybody.

    bob...
  6. jwelectric

    jwelectric Electrical Contractor/Instructor

    Messages:
    2,532
    Location:
    North Carolina
    posted in the wrong thread
    Last edited: Nov 22, 2008
  7. Giles

    Giles Retired tool & Die and Mechanic

    Messages:
    112
    Location:
    N.W. Alabama--Florence--
    speedbump---you are evidently the professional I needed an answer from. Excellent explination! THANKS
Similar Threads: Pump Wiring
Forum Title Date
Electrical Forum discussion & Blog Need advice on wiring sump pump outlet for emergency generator / 220v split to(2)120v Nov 5, 2010
Electrical Forum discussion & Blog Sub Pump wiring Nov 6, 2009
Electrical Forum discussion & Blog Pool pump timer Jun 2, 2014
Electrical Forum discussion & Blog Breaker and wire size for pool heat pump - MCA, wire and breaker size. Feb 28, 2014
Electrical Forum discussion & Blog Outdoor Fountain Pump Electrical Service Sep 20, 2013

Share This Page