3/4 hp pool pump motor @ 120v, 10.6 amps.
Replacing burnt 15 amp maintenance toggle switch.
In my head I figured switch to be rated for hp or twice the amperage of the motor.
430.109 (C) Stationary Motors of 2 Horespower or less gives three options for sizing.
1- not less than 2 times current of motor
2- motor current not more than 80% of switch rating
3- hp rated switch marked "Suitable as Motor Disconnect"
For 1- I would need a switch rated for 21.2 amps
For 2- I would need a regular 15 amp toggle switch off the truck (10.6 motor, on 15 amp switch)
For 3- I would need to send the guy at the counter to the back to look through labeling of 15 and 20 amp hp rated switches
Question, unless I'm reading this wrong, why anyone install any switch other than option 2 ?
I'm also reading that the switch requirements in all three options are saying "rating of the motor" and "full load current rating", So I'm assuming it's the actual motor and doesn't get based on the rating of Table 430.248 which would be 13.8 amps and not 10.6 amps making it
For 1- I would need a switch rated for 27.8 amps
For 2- I would need a regular 20 amp toggle switch of the truck
For 3- I would need to send the guy at the counter to the back to look through labeling of 15 and 20 amp hp rated switches
Again, why would anyone not choose option 2.
Am I missing something ?
Are there other scenarios that would make other than a regular 15 or 20 amp switch necessary?
Thank you
Replacing burnt 15 amp maintenance toggle switch.
In my head I figured switch to be rated for hp or twice the amperage of the motor.
430.109 (C) Stationary Motors of 2 Horespower or less gives three options for sizing.
1- not less than 2 times current of motor
2- motor current not more than 80% of switch rating
3- hp rated switch marked "Suitable as Motor Disconnect"
For 1- I would need a switch rated for 21.2 amps
For 2- I would need a regular 15 amp toggle switch off the truck (10.6 motor, on 15 amp switch)
For 3- I would need to send the guy at the counter to the back to look through labeling of 15 and 20 amp hp rated switches
Question, unless I'm reading this wrong, why anyone install any switch other than option 2 ?
I'm also reading that the switch requirements in all three options are saying "rating of the motor" and "full load current rating", So I'm assuming it's the actual motor and doesn't get based on the rating of Table 430.248 which would be 13.8 amps and not 10.6 amps making it
For 1- I would need a switch rated for 27.8 amps
For 2- I would need a regular 20 amp toggle switch of the truck
For 3- I would need to send the guy at the counter to the back to look through labeling of 15 and 20 amp hp rated switches
Again, why would anyone not choose option 2.
Am I missing something ?
Are there other scenarios that would make other than a regular 15 or 20 amp switch necessary?
Thank you
