Hi,
I am installing a pump on an existing well. The motor on the pump is 230 volt/7.2 amp. The placard reads ,"switchless motor, no switch, no governor,Thermally protected KA".
The following are questions I have regarding the installation:
1) What breaker would be correct, since it is protecting a motor?
2) Is 10/3 sheathed cable in pvc conduit adequate for an approximate 60/ft. run, panel to motor?
3) What needs to be done to ensure safe and compliant grounding? The motor frame has a small lug attached to it and a grounding-rod type clamp attached to the pressure- gauge nipple. This unit was rebuilt and put into storage many years ago, so I am unsure if these were put on by a knowledgeable person. The panel is at the service entrance and has a main disconnect, ground connected to neutral.
4) The well casing is 2" galvanized steel. Can I use PVC fittings ,pump to well, or will this affect the grounding?
As for my skill and knowledge, I have a background in general contracting and I know my limitations, so I very carefully follow the rules. I feel comfortable doing this project, but if it starts to feel like I'm in over my head, I will consult a real electrician.
Thanks, Ken

What's kind of cable that is "sheathed" are you planning on using?

If your considering using NM-B, AKA Romex, the answer is Romex is not allowed in buried conduit, or anywhere outdoor a building, as this is considered as a wet location.

Any wire used in conduit must be rated for wet location, or if buried without conduit, rated for direct burial.


Pulling a "sheathed" cable, such as UF cable, through conduit is difficult, and generally needs a conduit a bit larger than apparent.

Most well pumps use a direct buried twisted cable, such as seen here:
Submersible water well pump wire for use with submersible water well pumps. (http://deanbennett.com/submersible-pump-wire.htm)

And is buried directly in ground,although conduit can be used for extra protection. PVC conduit is fine.

Grounding is done by connecting the green wire to the lug on the exterior of the pump motor, and a lug on the well casing. Connect the green wire back at the panel to the proper grounding bar.

A minimum 15 amp breaker is fine, along with the #10 wire.