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220 240 Volt Air Compressor Wiring
©Copyright Dave Rongey - Summary:
How to Wire a 220 Volt Air Compressor – With a standard 240 volt motor for equipment such as an air compressor there are only two insulated wires for the 220/240 volts and one separate wire for the ground.
Understanding Ground Wires for 220/240 Volt Circuits
Electrical Question: I ADDED A SUB PANEL TO MY MAIN FUSE BOX.
- I HAVE 4 WIRES GOING TO IT.
- I’M PRETTY CONFIDENT ACCORDING TO YOUR WIRING DIAGRAM THAT PART IS FINE.
- I’M REWIRING THE DRYER FROM 3 WIRE TO 4 WIRE THAT’S EASY.
MY QUESTION IS:
- I HAVE A 220V AIR COMPRESSOR THAT ONLY HAS THREE WIRES.
- DO I CONNECT THE NEUTRAL(WHITE) TO THE NEUTRAL BAR OR TO THE GROUND BAR IN THE SUB PANEL?
I THOUGHT IF SOMETHING BAD HAPPENED THE NEURAL WOULD BE THE SAFER BET BUT I’M GETTING MIXED ANSWERS FROM THE INTERNET.
THANKS FOR YOUR HELP-BRAD
This electrical wiring question came from: BRAD, a Handyman from ENDICOTT, New York.
See more about Home Wiring for New York
Additional Comments: AWESOME.
Thanks for your electrical wiring question BRAD.
How to Wire a 220 Volt Air Compressor
Application: Electric Circuit for a 220 Volt Air Compressor.
Skill Level: Intermediate to Advanced – Best installed by a Licensed Electrical Contractor or Certified Electrician.
Tools Required: Basic Electricians Pouch Hand Tools and a Voltage Tester.
Estimated Time: Depends on personal level experience, ability to work with tools and the available access to the air compressor circuit and electrical connection box.
Precaution: Identify the air compressor circuit, turn it OFF and Tag it with a Note before working with the 220 volt air compressor wiring.
Circuit Size for an Air Compressor
The circuit size will depend on the size of the air compressor and the horsepower rating of the motor. The air compressor users manual will specify the required power source. A dedicated circuit will be required for most larger air compressors. A dedicated circuit will ensure ample power for the unit and prevent tripping a circuit that is shared with other equipment or tools.
220 Volt Air Compressor Ground Wire
Brad, I understand your thinking, and a lot of people get confused by this. The fact is that with a standard 240 volt motor for equipment such as an air compressor there are only two insulated wires for the 220/240 volts and one separate wire for the ground.
- There is no need for a neutral wire with this type of 220 Volt equipment.
- Newer 240 volt circuits for kitchen equipment such as ranges and laundry room dryers do require a separate insulated neutral wire and a separate ground wire because these new units have 120 volt control circuits.
- Such is not true for 220/240 volt air compressors yet.
- With new control circuits coming out for just about everything, this could change.
- The ground wire for the air compressor will attach to the separate ground terminal strip that is bonded to the electrical system ground.
- As with any electrical circuit, when installed properly, the ground wire is the most important wire of the circuit because it will help protect the equipment and the user in the event of a short circuit or electrical fault.
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