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Inactive, Master Electrician
Category: Electrical
Satisfied Customers: 4772
Experience:  Electrical Contractor
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how to wire-up 220V air compressor to house - What does L1

Resolved Question:

how to wire-up 220V air compressor to house - What does "L1" and "L2" mean in the motor wiring diagram?
Submitted: 9 years ago.
Category: Electrical
Expert:  Inactive replied 9 years ago.
L1 and L2 mean the two hot legs that come from the breaker to power the unit up. Can you tell me what the amp rating is on the unit?
Customer: replied 9 years ago.

it doesn't say. says a lot of stuff on the plate like 208-230 volts.


So I would connect the red wire to L1 and the black wire to L2. But the white wire (neutral) does that go to the ground screw on the motor casing INSIDE the connection box with or without the ground connected to the same terminal?

Expert:  Inactive replied 9 years ago.
You dont use a neutral in a compressor setup, you only need 2 hots and a ground. So the bare ground wire would terminate to the grounding screw. The white wire you just cap off and push to the side. In the panel, just cap the white wire and push it off to the side. Dont connect it to the neutral bar.
Customer: replied 9 years ago.
So going back to the breaker pannel, black wire to one breaker, red wire to the other breaker with the 240v setup with a bar across both breakers so they both turn on and off at the same time, and the ground to the ground inside the breaker pannel and cap off the neutral wire at the breaker box?
Customer: replied 9 years ago.
Expert:  Inactive replied 9 years ago.
Yes you are exactly correct
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