Can 20 Amp. Ciruit Breaker Support 1 Hp 115 Volt Single Phase Motor?

Yes It can... However, The breaker is overrated for the application.
So look at the specs on the motor carefully... But by and large you should have a 15Amp breaker.
It's suppose to trip when under heavy load to protect you. If you use a 20 A unit... the motor and wires can overheat and created unspeakable damage.
Get a 15Amp breaker.
Good luck;)

Quote:

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Originally Posted by bzitser

Can 20 Amp. Ciruit Breaker Support 1 Hp 115 Volt Single Phase Motor?

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Thank's Robair for your respond, but to my knowledge I have to size single phaze breaker minimum 20% above that total amperage draw by motor and 1HP whisperflo swimming pool pump(what I want to install) has full load 14,8 amps.
If I am right, my qwestion still stay .Please respond.
Sinserely yours
bzitser.

Almost correct, a 1 HP motor 1 Phase motor branch circuit and short circuit protection needs to be rated 125% of the value listed in NEC Table 430.148, which for 115 volts is 16 amps, so minimum size rating of a breaker is 20 amps.

An inverse time circuit breaker can be sized up to 250 % of the rating in Table 430.148, depending on several other factors that may not apply, since this is only a water pump.

Overload protection, if needed, will only use the nameplate rating of 14.8 amps, and again may or may not be required depending on other factors.

Yes.

A 1 HP motor draws about 13A at 120VAC. You should make sure that your wiring will support this load as well. Although # 14 would support 13A, the start-up current will be higher than 13A. You should wire to the motor with # 12 wire.

Yes.

A 1 HP motor draws about 13A at 120VAC. A 20A branch circuit breaker would be appropriate. You should make sure that your wiring will support this load as well. Although # 14 would support 13A, the start-up current will be higher than 13A. You should wire to the motor with # 12 wire.

I just saw the information about the 14.7A nameplate rating. The same answer applies with the slightly higher rating.

Based on my experience, using a 15A circuit breaker will result in a significant number of nuisance trips. The motor should have internal thermal protection to protect from overloads.