Latest Discussions : Electrical & Lighting

electricgirl

05:01PM | 09/15/03
Member Since: 07/20/03
17 lifetime posts
What kind of disconnecting means do I need for my well pump? It is 1/2HP, on a 2pole 20amp breaker.
Can I use a regular 2pole switch, or do I need a disconnect box?
Thanks!

MrElectricOly

08:50PM | 09/16/03
Member Since: 05/11/03
62 lifetime posts
No you can not use a standard switch. You need a "disconnect" that is rated at 20 amps 240 volt minimum. Be sure it is a two pole (so you can disconnect both hot wires) disconnect.

Tom O

02:17PM | 09/17/03
Member Since: 09/17/02
476 lifetime posts
You may not need a disconnect at all if the following two conditions are met, the controller is within sight of and within 50 feet of the circuit breaker for the pump.

If you do need a disconnect, then it would be possible to use a general-use snap switch suitable for use on AC current only, where the full load current of ther motor does not exceed 80% of the ampere ratiing of the switch. In my opinion, a 2 pole 20 amp switch will be fine for this application.

Also, I feel that your circuit breaker size is too big. Unless the nameplate on your pump calls for a 20 amp breker, a 1/2 horsepower motor at 230 volts should be on a 15 amp breaker.

Tom

[This message has been edited by Tom O (edited September 17, 2003).]



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