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Wiring a 220 30 amp dryer outlet to a 110 30 amp RV outlet...can it be done?

Wiring a 220 30 amp dryer outlet to a 110 30 amp RV outlet...can it be done?

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Old 07-29-15, 01:33 PM
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Wiring a 220 30 amp dryer outlet to a 110 30 amp RV outlet...can it be done?

I would like to piggyback off an Electric Dryer 30 amp (240 volt) outlet and connect it to a RV 30 amp (110 volt) outlet. The electric dryer outlet is a NEMA 10-30 and comes off a double pole 30 amp breaker. The RV outlet is a "Recreation Use Only" 30 amp 120 volt XD-010. Can I use just one leg of the dryer hot (red or black) and the neutral (white) to attach to the RV plug and leave the ground off? I don't have a ground on the dryer plug, just two hot (110 volts each) and a neutral.
 
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Old 07-29-15, 01:43 PM
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Not an electrician but I don't think you can extend a circuit which doesn't have a ground. Might also be other reasons this is not a good idea.
 
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Old 07-29-15, 01:54 PM
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just two hot (110 volts each)
No, the hots are each 240 volts. The RV receptacle is 120 not 110. As stated, by code an ungrounded circuit can not be extended and it is best not to share with a dryer circuit.
 
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Old 07-30-15, 04:04 PM
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Ray2047, I checked with a volt meter and each hot is only 120 volts (one probe in the neutral and the other in one of the hot.). With both probes in each of the hot at the same time, it is 240 volts. I'm not an electrician, but if you had two (2) 240 volts connected at the same time, wouldn't that make 480 volts? There is also a ground going to the outlet but not attached. Still advise not to extend? Thanks for your help.
 
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Old 07-30-15, 05:08 PM
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Ray2047, I checked with a volt meter and each hot is only 120 volts (one probe in the neutral and the other in one of the hot.
That isn't how you measure. You measure hot to hot. You house is supplied with 240 and a wire from a center tap on the transformer secondary called the neutral. 120 is derived from the center tap and either hot.
I'm not an electrician, but if you had two (2) 240 volts connected at the same time, wouldn't that make 480 volts?
No.

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There is also a ground going to the outlet but not attached. Still advise not to extend? Thanks for your help.
If you remove the dryer receptacle you could use the cable. If you continue use it for the dryer for safety it needs to be converted to a 4-wire receptacle and the cord changed on the dryer.
 
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Old 07-30-15, 09:03 PM
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Ray2047...Thank you....I think I've got it now, maybe. I guess I misunderstood when you said each hot was 240 volts. Are you still saying that I shouldn't piggyback off the outlet even if I change it to a four wire receptacle and change the dryer plug? I still want to use the dryer, but add another receptacle for the RV. Really do appreciate your help.
 
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Old 07-30-15, 09:30 PM
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Generally the dryer should be on a dedicated circuit.
 
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Old 07-30-15, 09:46 PM
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Thank you a whole lot Ray2047. Been a heap of help.....
 
 

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