I have a new 1 1/2 HP lawn irrigation pump. It was wired for 110 volts
And runs to a 25amp breaker. It works fine unless the pump runs for
More than 4 or 5 minutes. Then the breaker blows. The pump can run
On 220 as well. I have a receptical in my garage that is 220 and has
Two flat poles and a ground. Meaning it has two hot wires and ground wire.
This is connected to a gang 30 amp breaker. Can I use this for the pump?
The pump has a switch to change the voltage from 110 to 220.
I will be running 12/2 or 10/2 to the pump.

Yes you can use but is this hard wired or on a plug?

Quote:

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Originally Posted by pickner

I have a new 1 1/2 HP lawn irrigation pump. It was wired for 110 volts
and runs to a 25amp breaker. It works fine unless the pump runs for
more than 4 or 5 minutes. Then the breaker blows. The pump can run
on 220 as well. I have a receptical in my garage that is 220 and has
two flat poles and a ground. Meaning it has two hot wires and and ground wire.
This is connected to a gang 30 amp breaker. Can I use this for the pump?
The pump has a switch to change the voltage from 110 to 220.
I will be running 12/2 or 10/2 to the pump.

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If you are here in the U.S.A. your electrical service is 120/240.

I need several questions answered by you, please.

1) How long of a cable run is there from the power source to the pump?

2) What type of conductors are in the cable (Copper or Aluminium) and what type of cable did you use?

3) How long has this configuration been working properly?

4) What is the amperage required on the nameplate of the pump (FLA)#. According to Table 430.248 a 1.5 HP motor fed by 115 Volts will draw 20 amps. This is the "FLC" value.

5) Have you changed the fuse recently and did you use an exact replacement fuse?