Table Saw keep blowing 20 amp fuse. It is a Central Machinery table Saw, near a 2 hp motor wired for 110vl? I have be using it successfully for 6 years plugging it...
I have be using it successfully for 6 years plugging it into my outlet that I use for the washer( not running). It just started blowing 20 amp fuses when I start it up. It will run lacking the belt so I checked the belt alignment and it was correct and no binding. Any design why it started to do this and how I might correct it.
Thanks
if the motor runs beside no problem on its own..the check the blade assembly and see if you can turn it freely..if the blade turns hard later you will either own to replace the ball bearing..if its sleeve bearings thenoil them...seize the pully on the blade shaft and see if you can find sloppy movement inyour bearings...next to motor unplugged..grab the pully on the motor and check to see if its sloppy or turns rugged...it could also be a bad capacitor..discouraging centrifical switch or the start ...windings are not kicking out fast adequate causing high-ranking amp draw...you might have to nick it to a motor repair shop...you could also have a shaky circuit breaker..
I hold run a 2HP compressor on a 20 amp circuit for many years. A compressor take a lot more power than a saw except when you are adjectives some heavy duty things.
Are you plugging it directly into the outlet or through an extention cord? If a cord, how long and what guage? Cord should be a minimum of 12 guage and not very long. The longer and the smaller, the more the voltage drop. Motors hate voltage drop, they require more amps.
Many 2HP motors can be rewired for 220 volt. That cuts the current give or take a few in partially. Check the saw's instructions.
Is there anything else on equal circuit? If so, try turning everything else off.
Answers: You've been lucky for times gone by 6 years.
According to (2005) NEC Table 430.248, the full load current for a 2 HP, single phase motor is 24 Amperes. The "locked-rotor" current required at start up can be as large as 144 Amperes; but this is only for use when select a disconnecting means or motor controller.
Remember, most single phase, 120 Volt motors require overcurrent protection of 115% , and in that is a Code requirement is that the conductors supplying the motor shall not be rated for smaller quantity current than that at which the overcurrent device is set to trip (Article 430.224)
A 2 HP motor would require overcurrent protection of 27.6 Amps. You would use the next size standard breaker per Article 240.6; that would be 30 Amps, and would require #10 AWG THHN conductors per Table 310.16 & Article 240.4.