I"m installling a 220V circuit in my attached garage. The circuit will power an older waiting compressor which has actually a three prong plug. I have currently pulled a 10g 10/3 cable and mounted in a receptical box. I supplied 10g because the run is around 90 feet and the wait compressor is rated at 20 amps. There was a graph in residence Depot that recommended 10g. Ns purchased a three prong receptical to enhance the plug.I"m looking for confirmation top top my next steps. I have to cap the white cable on both ends due to the fact that it will not be in use. The black color goes in one side of the dual gang breaker and the red goes in the other. The floor attaches favor a floor on a 110v circuit. I"m going come the library to watch if i can discover a great book to be extra safe, yet was looking for specific feedback. Thanks in advance.

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Yes jus t cap the white at both ends don"t reduced it, you might need it later.The ground will go to package & to the the facility prong ~ above the receptacle.

As you probably realize, you perform not require the neutral wire (white) because that this device. However, someday it may be needed. Leaving it the same length as ath other wires and also simply ar a wire nu end the end. Tuck it out of the means in the panel and in the outlet box.
Great. Thank you both really much. One additional question if ns may. I saw the library this afternoon and also was reading around the code change in 1996. I don"t fully understand it, but it seemed to imply that the soil in a 10/2 is transferring some amount of current earlier to the panel and also not just to trip the breaker. The 10/3 add to the white to return the circuit and also the ground is used simply to pilgrimage the circuit-breaker. Again, I more than likely screwed the explanation up, however here is my question: must I investigate even if it is I can update mine compressor to usage a four prong plug? Or am i OK v the three prong and capping the white wire on both ends?Again, thanks.
Originally posted by gregwils Great. Say thanks to you both really much. One added question if i may. I saw the library this afternoon and was reading around the code readjust in 1996. I don"t fully understand it, yet it appeared to suggest that the ground in a 10/2 is carrying some amount of current ago to the panel and also not just to trip the breaker. The 10/3 adds the white come return the circuit and also the floor is used simply to expedition the circuit-breaker. Again, I more than likely screwed the explanation up, however here is my question: need to I investigate whether I can update mine compressor to usage a 4 prong plug? Or am i OK with the three prong and capping the white cable on both ends?Again, thanks.

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The change I doubt you room referring to is because that ranges and also dryer circuits. What is unique around those is the they have actually 120 volt loads and 240 volt tons in the very same appliance. That means that there is a existing flowing top top the neutral during normal operation. For countless years the united state NEC enabled the bonding of the metal framework such appliances come the neutral rather than inquiry a separate devices Grounding Conductor. Due to the fact that your compressor is just a 240 volt pack there is no location to affix a neutral to it so there is no safe conversion the you can undertake. --Tom H
As hornet has actually mentioned, that is dryers and also ranges that provided to be 3 wire and are now 4 wire. Dryers and ranges commonly have part 110 volt components, such as lights, clocks, timers, buzzers, etc. These sections of the applicance use 110 volts and need a path for the return current. Straight 220 volts is offered for the large job the these appliances perform, heating, and also does not require a return, as the return is via the other fifty percent of the 220 line.

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