I ordered an incubator from China (I live in the USA) and it's a 220v but it has a 110v plug. How do I change the 110v plug to a 220v?
First of all, be absolutely sure that the voltage is really 220V (or 230V or 240V, which really refer to the same thing), and that the current requirement doesn’t exceed the capability of your outlet. This is unlikely to be a problem—electric stove outlets in the US have 50A capacity, and dryer outlets are 30A. These are the most likely 240V outlets to find in your house.
Then, go to your local hardware store and buy the kind of 240V plug that fits your outlet. Cut the plug off the incubator cord and attach the new plug following the included instructions. If at any point you aren’t 100% confident in what you’re doing, stop and find someone who can help you, like an electrician or appliance repair person or an employee at the store where you bought the plug.
If you’re trying to plug the incubator into a dryer or electric stove outlet, the plug will have four blades, but the cord will have three wires. Connect the two hots and the ground, and leave the neutral blade (pin) disconnected. Don’t mix up the neutral and ground! (Again, if you’re not sure which is which, don’t risk it—find somebody with the right experience and knowledge who can help you.)
Just as an aside, are you sure it’s a 110V plug? The 240V 15A and 20A outlets (NEMA 6–15 and 6–20) in the US look very similar to the 120V ones (NEMA 5–15 and 5–20). In particular, it’s very common to confuse the NEMA 6–20 (240V 20A) with the NEMA 5–20 (120V 20A). They’re both the same size and neither is very common, so most people aren’t very familiar with them.
Diagram by Orion Lawlor on Wikimedia Commons. This image shows outlets (receptacles), not plugs.
