Hello,
I have to replaced my pool pump motor which was making so much noise (Hayward SuperPump 1 HP; 230V). I also noticed that the switch located between the breaker and the pump was not working quite right; I had to jiggle it to turn the pump ON. So I bought an equivalent dipole switch and replaced that too. It tripped the circuit breaker. The old dipole switch had the line connections at the side, while the new dipole switch had the line connections at the top. So I connected the line connections (from the breaker) at the top, load connections (to the pump) at the bottom, reset the breaker, and now I only have one live connection to the pump side. With the switch ON, I have only 115V at the black to green connection; 0 - 5 V with the other black to green connection; and 0 - 5 V with the 2 black wires. There are only 3 wires; no white wire.

It seemed that the pool timer was also acting funny; it never seemed to work, so the previous owner had it set to ON manually all the time 24/7. So I replaced that too making sure to get the same timer, an Intermatic T101, 120V SPST . There are 4 wires that feed into the timer: 2-black wires, a green wire and a white wire. I connected them to the new timer, same as the old timer. With the switch ON manually, I get 115V on either black to green connection, and 0 V on a black to black connection.

With the timer set to ON manually, and the dipole switch also ON, I still get one live connection. That is, I have 115V at the black to green connection; 0 - 5 V with the other black to green connection; and 0 - 5 V with the 2 black wires. If I shut OFF the timer manually, but leave the switch ON, there are no live connections to the pump at all. I checked the circuit breaker by pressing the yellow reset button, and it trips.

But I'm not sure? I'm expecting 115V on either black to green connection; and 220V on a black to black connection.

Is everything OK before I connect the new pool pump motor? I've set the selector on the motor to 220V.

Something's not right; but I'm not sure where to start; is it time to call an electrician?
Martin