TRANSFER switch

[Grumpy Gary]

2015 Crossroads Rushmore . Having an issue with shore power a/c . I only have one leg of 110 v to transfer switch but everything in converter checks out ok. Wondering if transfer switch will ground out one leg???

 

[Lloyd S]

If you only have one leg coming into the transfer switch, it seems the problem is before the transfer switch.

 

[Wingerdinger]

You are going to have to trace the two legs of power from the source.
I would not suspect the transfer switch first, but it's easy enough to check the input and output.
You would not have anything 'ground out', or you would have a short, resulting in blow breakers. A ground out would be pretty unusual. It is much more likely an open circuit, usually a loose terminal or connection.
I would carefully inspect the power distribution area for loose connections with the power off.
The convertor converts 110 to 12 volts and would have nothing to do with your problem.

 

[DavisK]

I have had issues with one leg not having power at a couple of campgrounds. I always plug my Progressive EMS into the pedestal and flip the breaker on to check the power before I unhitch my camper. If everything is OK, I flip the breaker back off and setup my camper.

 

[Yakherder]

This sounds dumb but is a question anyway - What is the transfer switch?

I'm not an electrician and only have basic electrical knowledge and here is my thought.

Shore power comes in from an campground hookup. On my 30amp there is a ground and two prongs on the plug. Each prong carries 110v from either one 30amp fuse or two 15amp fuses thus giving the trailer and converter 30amps. If you are getting 110v on one line it may be possible that one of the prongs is not receiving any power.

Use a tester on each line in your cable when hooked to the outside power supply to see if one line is dead.

I'm interested to see how this one works out.

 

[dagst1]

Basically a transfer switch switches from one power source to another automatically. For example my Inverter has a built in transfer switch so if the main power goes down it automatically switches on the inverter so the refrigerator keeps running. Then when power is restored it switches back to shore power. It came in handy this year when the power went out. They are common in motorhomes and trailers with generators.

 

[Yakherder]

Thanks dagst1 for enlightening me on the transfer switch. As I don't have an on-board generator, I don't have to worry about a transfer switch on my unit.

 

[dagst1]

We do not have a generator either but with a residential refrigerator we needed the inverter with the transfer switch.

 

[Maggie May-THOR]

I know this post is old but I have to ask... Does the OP have a 30 amp system? and How did he determine that 1 leg was dead?

As Yakherder said, with a 30 amp system you have 2 prongs and a ground. BUT 1 prong is the hot side (black) while the other is neutral (white). If you are measuring voltage between the black and white wires you should see 120V. If you measure between the black and ground, you should see 120 V. If you measure between the white and ground you should see 0 volts.

 

[16ACE27]

I know this post is old but I have to ask... Does the OP have a 30 amp system? and How did he determine that 1 leg was dead?

As Yakherder said, with a 30 amp system you have 2 prongs and a ground. BUT 1 prong is the hot side (black) while the other is neutral (white). If you are measuring voltage between the black and white wires you should see 120V. If you measure between the black and ground, you should see 120 V. If you measure between the white and ground you should see 0 volts.

Well since the OP has not been back to clarify their issue, we can only assume they have a 50 amp RV since the phrase "one leg of 110 v" is usually used when talking about a 240 VAC system with two hot legs of 120 VAC each. But then, there's a lot of unknowns, including the OP's electrical knowledge level.