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Open Roads Forum  >  Tech Issues

 > Probem w/trying to wire a 2nd AC for independent power

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SolidAxleDurango

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Posted: 06/12/12 07:23pm Link  |  Quote  |  Print  |  Notify Moderator

smkettner wrote:

30 amp ATS wire diagram


I assume this is in response to my comment. Which diagram/page should I refer to?


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mikestock

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Posted: 06/12/12 07:29pm Link  |  Quote  |  Print  |  Notify Moderator

teddyu wrote:

My guess is that the 20A receptacle at the pedestal is powered from the 30A circuit breaker for the 30A plug. Probably wired this way to prevent what you are trying to do. JM2C...


May be the case some of the time but not always. I found that, in the case of a campground we frequent often, the 30 amp circuit and the 20 amp circuit come from completely different main breakers. Found this out when we lost power to the 30 amp circuit but were able to use the 20 amp circuit. Since then, we are able to run the front, auxiliary, ac by running a 15 amp extension cord in through a slide out and plug the aux unit in directly. My fifth wheel was prepped for the front ac with a receptacle in the ceiling so I when I added this second unit I just put a male plug on the unit and plug it into the receptacle. Run two units in this campground always when the weather is hot.


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smkettner

Southern California

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Posted: 06/12/12 07:31pm Link  |  Quote  |  Print  |  Notify Moderator

D1 P5, D2 P6 shows connecting both hot and neutral to the switch. I am certain the neutral is switched. Ground is just tied to a bus.


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SolidAxleDurango

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Posted: 06/12/12 08:04pm Link  |  Quote  |  Print  |  Notify Moderator

smkettner wrote:

D1 P5, D2 P6 shows connecting both hot and neutral to the switch. I am certain the neutral is switched. Ground is just tied to a bus.


I appreciate your certainness. That diagram however does not show the workings of the transfer switch itself.

It is not necessary for them all to be switched. So in essence, our conversation moot.

shadoow

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Posted: 06/13/12 07:58am Link  |  Quote  |  Print  |  Notify Moderator

OP here. Just want to thank everyone for their thoughts and info. I'm sure with all your help i'll be able to get something going. I'm trying to do this as cheap as i can (read retired) and try to use what i've got as much as possible so i'll have to digest all this info to figure out where to go from here.
thanx again folks


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wa8yxm

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Posted: 06/13/12 01:11pm Link  |  Quote  |  Print  |  Notify Moderator

I did it with the rear,, First, I do not have an Energy Mangement system, if I did this would require a modification of the procedure I'm about to outlline.

In my case the breakers are in a "Hall" area, near the floor, Behind the wall is a cabinet that extends all the way to an outside wall, I cut a hole in the outside wall and installed an access "Hatch" there, one of the square electrical hatches.

I then got a 12ga Extension cord that was a bit longer than 2x as long as the distance from said box to the breaker box, and a Junction box.

Disconnected the Rear A/C (Would have been the same job if I'd done the front) from the breaker, box, Pulled all e (White/Black/bare) wires, and routed them to the junction box.

Cut the cord in half, so I now had two pigtails half as long as the original cord.

The plug end of cord was routed thorugh the access box, to the junction box, White to White, black to black, bare to green, wire nuts, solder and tape.

The outlet half went to the original breaker connections.

TO use "As designed" *By the motor home maker) plug cord into it's other half.

To independently power, pull plug and plug into a 12ga extension cord (Sears, K-Mart, Lowes and Home Depot all carry those, I assume Mennards does as well)

To air up service side tires, Unplug A/C and plug compressor into same outlet.

NOTE: A puriest would have pout a 20 amp breaker in that junction box.


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OnaQuest

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Posted: 06/14/12 08:04pm Link  |  Quote  |  Print  |  Notify Moderator

SolidAxleDurango wrote:

Transfer switches transfer only the hot. Not neutral or ground.

Not true....

SolidAxleDurango

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Posted: 06/14/12 08:14pm Link  |  Quote  |  Print  |  Notify Moderator

OnaQuest wrote:

SolidAxleDurango wrote:

Transfer switches transfer only the hot. Not neutral or ground.

Not true....


Actually it is. Or someone had better tell Generac. The one for my home standby switches only the hot.

smkettner

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Posted: 06/14/12 09:18pm Link  |  Quote  |  Print  |  Notify Moderator

OEM RV transfer switches tend to switch the neutral.

Obsolete

OnTheRoad

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Posted: 06/14/12 09:31pm Link  |  Quote  |  Print  |  Notify Moderator

I had to replace my Intellitec transfer switch that transfers the rear air conditioner to the generator's 20a service (2nd breaker) and it switches both hot and neutral.


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