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Currently I have a NEMA 14-30 receptacle for the dryer. I'm wondering is it possible to split one receptacle into 2 NEMA 14-30 receptacles and install a switch to select which receptacle to use when needed?

I need to have an extra jack for my car charger, otherwise I have to unplug the dryer every time I need to charge my car.

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Why do you want a switch? –  Jay Bazuzi Mar 25 '13 at 14:45
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4 Answers 4

You could use a double throw switch.

Double Throw Switch

Other materials required are just commonly available residential wiring supplies. Enclosures or boxes, wire, conduit, etc. Exactly what you use is unique to your situation and difficult to speculate about.

Update: Do note this is not the cheapest of devices. As noted by longneck, running a new circuit may be cheaper. This would be quite true unless the panel is a fair distance from the outlets. Now that we have more detail about the intended use, running a new circuit as suggested by Michael Karas is the only reasonable solution. You do not want to be in a position where you cannot charge your car because you need to dry your clothes, or vice versa. You spent good money on a nice electric vehicle, you deserve to have a proper charging setup for it.

This is so important that in the off chance your service cannot handle the additional load, you should seriously consider what's involved in upgrading the service. There will be additional benefits to this beyond being able to charge your car when you need to.

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The cost of putting in a double-throw switch is probably equivalent to or more than the cost of putting in a dedicated circuit and outlet.

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Making your existing dryer circuit switchable is not the best way to address the need for a car charger plug. On top of that by the time you get done purchasing all the materials and and investing in labor to implement the proposed scheme you will likely have spent more money that if you did it the preferrable way.

The better way to do this is to get an experienced person to add another circuit breaker for your power entry panel and run some new wiring circuit to a new plug for the car charger.

The only reasons I can think of for trying the proposed jack switching approach is if there is no way to add an additional breaker to your existing panel or that your existing panel is so under rated that it could not support the an additional circuit. Do note that if your panel is currently full of single wide circuit breakers for lights and outlets it is easy to remidy that situation by replacing those breakers with newer ones that provide support for two circuits per single width location. Replacment of four single circuit single width breakers of the type shown below will open up two adjacent spots needed for your new car charger circuit breaker.

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Tandem breakers may not be available for all makes/models of service panels, so they may not be an option in all situations. –  Tester101 Mar 25 '13 at 17:25
    
His panel may be a long or difficult run from the car charging location; if walls need to be opened up, the cost of a new circuit may not be trivial. –  TomG Mar 27 '13 at 1:13
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switching 30 A circuits isn't trivial. It would help to know why..

A couple of 30A disconnect switches would be one way..

enter image description here

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But what kind of wiring , any other accessories do I need? –  user12223 Mar 24 '13 at 23:25
    
Would you please revise your question and explain the 'why' of your situation. –  HerrBag Mar 25 '13 at 3:02
    
Oops sorry about that, I need to have extra jack which is for the car charger, otherwise I have to unplug the dryer jack every time when I need to charge my Nissan leaf –  user12223 Mar 25 '13 at 4:50
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