Converting a 120 Volt Motor to 240 Volts
How to Convert the Electrical Circuit Voltage for a Motor: There are multiple problems here. You and the electrician did not discuss exactly what the 240 volt outlet would be used for. This is a big mistake, and I’m amazed that the electrician did not ask you what the circuit would be used for.
Converting the Electrical Voltage of a Motor
Electrical Question: I have an old Craftsman table saw that can run on either 120v or 240v with a minor change within the motor, which has three input wires – a ground and two lines. For some years, I’ve operated it at 120v, but it lacks the power to rip certain hardwoods.
- Recently, in conjunction with another project, I asked a licensed electrician to install a 240v outlet in my garage, but wasn’t specific about what I wanted.
- He installed a 4-wire outlet, and provided me with a matching plug, and I thought it would be a piece of cake to connect up the table saw motor.
- I bought a double-pole, single throw switch, which has two terminals marked Load and two marked Line.
- After checking the switch with my ohm meter, I connected the switch and the motor but found that when I turned the switch on, the circuit breaker blew.
- I ran the black wire from the plug to a Load terminal, then a wire from the corresponding Line to the motor, and similarly for the red wire from the plug.
Clearly, I’m missing something, but what?
Background: Michael, a Handyman from Sherwood, Oregon.
Thanks for your electrical wiring question Michael.
How to Convert the Electrical Circuit Voltage for a Motor
- There are multiple problems here. You and the electrician did not discuss exactly what the 240 volt outlet would be used for. This is a big mistake, and I’m amazed that the electrician did not ask you what the circuit would be used for.
- Next – you are not understanding the meaning of Line and Load. Line is the incoming power side of the switch. Load is the load being placed on the Line, that being the table saw motor.
- A typical 240 volt table saw motor only requires three wires, two hots, one ground. The size of this required circuit will be determined by the horsepower size of the motor. Also, when changing the voltage from 120 to 240 volts, most motors require the internal wiring configuration to be changed.
- I would speculate that you have wired a direct short circuit configuration of hot to hot or a hot to neutral which is causing the circuit breaker to trip off.
- In summary, it would have been great if you would have shown the table saw to the electrician and allowed him to wire specifically, and provide the switch and motor connections.
More about Electrical Wiring:
Electrical Wire for the Home
Complete listing of electrical wire types and parts used for home projects with electrical code information serves as selection guidelines.
Wiring 240 Volt Electrical Outlet
Home electrical wiring includes 110 volt outlets and 240 volt outlets and receptacles which are common place in every home. See how electrical outlets for the home are wired.
Garage Electrical Wiring
Fully Explained Photos and Wiring Diagrams for Garage Electrical Wiring with Code Requirements for most new or remodel projects.
Work Shop Electrical Wiring
Fully Explained Photos and Wiring Diagrams for Workshop Electrical Wiring with Code Requirements for most new or remodel projects.
The following may also be helpful for you:
Be Careful and Be Safe - Never Work on Energized Circuits!
Consult your Local Building Department about Permits and Inspections for all Electric Wiring Projects.
The Safest Way to Test Electrical Devices and Identify Electric Wires!The Non-Contact Electrical Tester
This is a testing tool that I have had in my personal electrical tool pouch for years, and is the first test tool I grab to help identify electrical wiring. It is a Non-contact tester that I use to easily Detect Voltage in Cables, Cords, Circuit Breakers, Lighting Fixtures, Switches, Outlets and Wires. Simply insert the end of the tester into an outlet, lamp socket, or hold the end of the tester against the wire you wish to test. Very handy and easy to use.
The Quickest Way to Check for Faulty Electrical Wiring!The Plug-In Outlet Tester
This is the first tool I grab to troubleshoot a problem with outlet circuit wiring. This popular tester is also used by most inspectors to test for power and check the polarity of circuit wiring.
It detects probable improper wiring conditions in standard 110-125 VAC outlets Provides 6 probable wiring conditions that are quick and easy to read for ultimate efficiency Lights indicate if wiring is correct and indicator light chart is included Tests standard 3-wire outlets UL Listed Light indicates if wiring is incorrect Very handy and easy to use.
Strip Off Wire Insulation without Nicking and Damaging the Electric Wire!The Wire Stripper and Wire Cutter
My absolute favorite wire stripping tool that I have had in my personal electrical tool pouch for years, and this is the tool I use to safely strip electrical wires.
This handy tool has multiple uses:
The wire gauges are shown on the side of the tool so you know which slot to use for stripping insulation.
The end of the tool can be used to grip and bend wire which is handy for attaching wire onto the screw terminals of switches and outlets..
The wire stripper will work on both solid and stranded wire. This tool is Very Handy and Easy to Use.
|More articles about 220 Volt Wiring, Motor and Home Electrical Wiring:|
|« Previous||Next »|
|How to Avoid Burning Up a Ceiling Fan with a Dimmer Switch||Energy Savings Controls for Outdoor Lighting|