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Old 11-12-2014, 01:55 PM   #1
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30 amp hook up to garage

Can I hook up to my garage that runs six fluorescent fixtures?
It now has a 20 amp breaker which I will replace with a 30 amp breaker and add an outlet that has a 30 amp plug!
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Old 11-12-2014, 02:06 PM   #2
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You need to look at the romex wiring and see if it is large enough for 30 amp.
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Old 11-12-2014, 02:08 PM   #3
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NO

You can not just change a breaker to 30 amps. Breakers are rated for the size of the wire that feed it. If you want 30 amps to the new outlet either run a new #10 line to it.

I have a 30 amp plug on the 20 line but know I will never use the AC in the trailer while plugged into it. It is just for battery charging and frig before we go out.

If you do put in a receptacle put a switch before it and use the switch to turn the receptacle off before connection and disconnecting. Failure to do this will cause an arc across the blades of the plug and receptacle and shorten the life of both.
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Old 11-12-2014, 02:08 PM   #4
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Don't put in a 30 amp breaker unless you change the wiring. The reason it has a twenty amp breaker is to protect the wiring that is installed. A 30 amp outlet and breaker will require 10 gauge wiring to be run. A twenty amp circuit only uses twelve gauge wire, which is too small for 30 amps of current.

That's a very simplified explanation, but it will keep you from burning down your house...

Now, if you want to get an adapter and plug it into a twenty amp outlet, you'll be fine until you turn on enough appliances to draw more than twenty amps of current, at which point your breaker will trip. I plug mine into a regular old fifteen amp wall outlet all the time, which will run your refrigerator, or your a/c unit, but usually not both without tripping the breaker...

-Red, simplifying the electrical world since 1962...
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Old 11-12-2014, 02:13 PM   #5
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An important question is "Why do you want to plug into this circuit in the garage?"

If your answer is "to charge the batteries, run the refrigerator and keep the lights on" or something along those lines, you'll be fine with using a 15A-to-30A adapter and plugging into the regular receptacle that's already there. If you want to run the trailer's AC, pay heed to the posts above.

If you call an electrician to put in an electrical circuit, make SURE the electrician understands you want a 30A 120V RV circuit (the receptacle is called a NEMA TT-30R). Get this agreement in a written form if possible, and check the voltage on the installed receptacle before you plug your Airstream in. Some electricians seem to think RVs are supposed to use a 240V dryer socket...
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Old 11-12-2014, 02:16 PM   #6
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Quote:
Originally Posted by Panama Red View Post
Don't put in a 30 amp breaker unless you change the wiring. The reason it has a twenty amp breaker is to protect the wiring that is installed. A 30 amp outlet and breaker will require 10 gauge wiring to be run. A twenty amp circuit only uses twelve gauge wire, which is too small for 30 amps of current.

That's a very simplified explanation, but it will keep you from burning down your house...

Now, if you want to get an adapter and plug it into a twenty amp outlet, you'll be fine until you turn on enough appliances to draw more than twenty amps of current, at which point your breaker will trip. I plug mine into a regular old fifteen amp wall outlet all the time, which will run your refrigerator, or your a/c unit, but usually not both without tripping the breaker...

-Red, simplifying the electrical world since 1962...
You could achieve the same thing by changing just the plug and not the breaker to 30 amp 110 volt.
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Old 11-12-2014, 02:26 PM   #7
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Yeah... Now you're just making it TOO easy... Wink wink, nudge nudge.

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Old 11-12-2014, 02:57 PM   #8
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Attached garage? I had space in my main breaker box for the house and ran a new 30A circuit to the garage from the basement. The run was only about 30 feet total from the basement and up through the garage/laundry room wall. $100 and 2 hours....done!
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Old 11-12-2014, 03:12 PM   #9
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Installed RV plug and breaker in power box just inside son's garage door in Alabama. AS cable under the door, plug in, flip breaker, and we're in business.

Took longer to mount a 2x4 old work box in the wall under his panel than it did to wire it. Neat, tidy and kid proof.

Big box stores carry the parts. Be sure to wire with 10 gauge wire with ground and get it connected right.

Breaker is left off unless we are plugged in. YMMV.


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Old 11-12-2014, 04:24 PM   #10
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Thanks guys,
I will run new wiring and make a new 30 amp breaker dedicated to the RV, so I can run AC!!
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Old 11-12-2014, 04:59 PM   #11
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I had an electrician put in a 50 amp rv plug and breaker.
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Old 11-13-2014, 11:48 AM   #12
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That's exactly how I did it. I was building a new shop just after we bought our AS so I did a 20 amp circuit for the lights and stuff and a 30 amp circuit for "Wally".
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Old 11-13-2014, 12:16 PM   #13
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I bought a male 20 to female 30 adapter at Amazon. I have the fridge on gas, don't run A/C. It just flipped the house breaker one time, so now I watch it.
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Old 11-13-2014, 01:29 PM   #14
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I did that before I had the new breaker, wiring, and receptacle installed.
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