2 speed pump trips breaker

[NEPApoolguy]

Thanks for the replies...its not actually my pool...but a customers...in order to read the voltages....I had to disconnect the wires from the pump itself....cause otherwise it trips the breaker instantly....so I dont believe its the terminal block on the pump....that seems to be ok....the customer bought a pentair control system with a 2 speed relay and installed the system himself....he claims that the 70 volts applied to the not used windings shouldn't be a problem....I think differently....customer claims the pentair system is 100% wired correctly.....guess we'll have to check....my question was the 70 volts....sounds like the above post agree with me....by the way....this customer claims to be an electrical engineer.

[BigDave]

Electrical theory and the trade practice of Electricians are different and often not mutually understood. Power Systems Engineers should understand that unbalanced loads and neutral faults and opens (in the customer premises as well as the mains and distribution networks) can cause unexpected voltages on neutral and lines. Neutral should be connected to Ground at the service entrance panel so voltage on the power company neutral could be seen on the Ground line.

I'd want to know what the line to line and line to ground voltages are on this circuit with the control system disconnected.

Bottom line - something's wrong. A good Electrician with pool experience should be able to help.

[Watermom]

I'm going to ask Poconos to take a look at this thread for you.