How do you attach a 3-wire green white black 240V electric heater to a 4-prong red black white green plug to plug into an electric range 240V outlet?

Answer 1

You dont. On a 220 circuit, the black is 110 hot, the red is 110 hot, the white is neutral, and the green is ground. You have to have 4 wires to get 220. If your appliance has only three wires, black, white, and green, it is not 220, but 110. You may have 220, with the white being the other hot. The only way to know is to trace the wire or check it with a meter. Either way, if you only have 3 wires there is no safe way to install a 4-prong outlet onto this wiring! Don't try it. Rerun the wire or call an electrician. Do it fight or don't do it at all, your negligence could kill someone. The person above is wrong. There are safe, and UL certified ways to do this assuming your heater is like most 220v appliances.

Many large appliances offer the capability to use either a 3-prong or 4-prong plug. In fact, most appliances nowadays don't even come with the cord, because they expect you to buy the one that matches your house wiring (be it 3 or 4 prong). Look near where the cord goes into your heater. Is there an access panel you can remove to see where the cord is wired into it ? Open that panel and look inside, you should see a block with 4 screws, three of which go to the three wires in the cord, the other will have a small metal strip connecting the middle screw to the 4th screw that has no wires screwed into it. At any hardware store, you can buy a new 4-prong cord for your appliance. They typically cost under (US)$20 . To install that cord onto your appliance, you simply unscrew each of the 4 screws in your heater, remove the metal strip between the middle and 4th screws, then install your new cord by connecting the center Neutral wire (typically white), the two 110v hot wires (typically red and black) on each side of the neutral, then the ground wire (typically green, or bare copper) to the 4th ground screw. Once you have your new cord installed, plug it in and enjoy your new heater ! Additional Info: That chord has improper coloring for 3-wire 220 hookup. White should always be ground. Technically, the copper doesn't care and a copper wire covered in white carries current as well as one in red. In your case green is ground and black and white should go to power. The bad part is that white is always assumed to be a safe (ground potential) wire for 110 circuits and should be red (or blue) for the other hot side of a 220 circuit.

Answer 2

In a lot of areas, but not in all, you can put the neutral and ground together at the appliance.

Before you do any work on a range circuit, it is essential that you ask the electrical installation inspection authority in your area about this, it is a serious safety matter. Call and ask them what the rule is in your area.

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As always, if you are in doubt about what to do, the best advice anyone should give you is to call a licensed electrician to advise what work is needed.

== == If you do this work yourself, always turn off the power

at the breaker box/fuse panel BEFORE you attempt to do any work

AND

always use an electricians test meter having metal-tipped probes

(not a simple proximity voltage indicator)

to insure the circuit is, in fact, de-energized.

IF YOU ARE NOT ALREADY SURE YOU CAN DO THIS JOB

SAFELY AND COMPETENTLY

REFER THIS WORK TO QUALIFIED PROFESSIONALS.

Answer 3

Black would be hot, white would be hot, and green would be common. Four wire is usually two hots, a common and a chasis ground. Just make sure you don't connect one of the service hot wires to the green wire. So, if you are wiring this to service with black, red, white, and green (bare) wires, you connect black to black, and green to green. The white wire of the cooktop connects to the red wire. The white wire of the feed should be capped with a wire nut.

Answer 4

White and black to the top two prongs and the gr

een wire to the middle bottom prong! The green is always the Ground?