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Open Roads Forum  >  Tech Issues

 > Open Neutral with 30 amp service

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pianotuna

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Posted: 07/11/12 08:27am Link  |  Print  |  Notify Moderator

Hi,

How would an open neutral affect a 30 amp service? Are there risks from this for us lowly 30 amper folks?


Regards, Don
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rockhillmanor

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Posted: 07/11/12 08:39am Link  |  Print  |  Notify Moderator

pianotuna wrote:

Hi,

How would an open neutral affect a 30 amp service? Are there risks from this for us lowly 30 amper folks?


Read this ASAP!
http://www.myrv.us/electric/Pg/open_neutral.htm
Scroll down to the bottom of page for 30 amp, not as dangerous as plugging into 50 amp, but low voltage can cook your A/C.


"We must be willing to get rid of the life we've planned,
so as to have the life that is waiting for us".



smkettner

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Posted: 07/11/12 08:45am Link  |  Print  |  Notify Moderator

Open? Same as open hot... no power.


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Denny & Jami

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Posted: 07/11/12 09:00am Link  |  Print  |  Notify Moderator

pianotuna wrote:

Hi,

How would an open neutral affect a 30 amp service? Are there risks from this for us lowly 30 amper folks?


Depends on where the open neutral is, if it's in the 30 amp rec or anyplace between the rec and your panel you will no have power, if it's in the 240 volt anywhere before the pedestal the voltage on either legs will be floating up an down depending on the load on each leg. So one minute you may have high voltage and the next low voltage.

Denny


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keelhauler1

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Posted: 07/11/12 09:11am Link  |  Print  |  Notify Moderator

Do you mean open ground?
If there is no ground, your RV chassis will probably be at 60v. This will be a shocking experience when you touch a metal part and are standing outside while barefooted.

Get a volt meter and measure from any metal to any outside ground, you will be shocked at what you find.

You need a grounds wire.

As others say. if you mean no neutral, you will have no power.


John

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Wayne Dohnal

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Posted: 07/11/12 10:14am Link  |  Print  |  Notify Moderator

Denny & Jami wrote:


Depends on where the open neutral is, if it's in the 30 amp rec or anyplace between the rec and your panel you will no have power, if it's in the 240 volt anywhere before the pedestal the voltage on either legs will be floating up an down depending on the load on each leg. So one minute you may have high voltage and the next low voltage.

Denny
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pianotuna

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Posted: 07/11/12 11:21am Link  |  Print  |  Notify Moderator

Hi,

I see I need to clarify the question.

Ok

No problems in the RV or the cord to the RV. Problem at Pedestal or before it. Problem identified as an "open neutral".

Scenario #1

a 30 amp pedestal (no 50 amp anywhere in park). Problems caused by open neutral?

Scenario #2

A 50 amp pedestal with a 30 amp outlet. Problems caused by an open neutral?

Scenario #3

A 50 amp pedestal using a 30 amp adapter plugged into the 50 amp outlet. Problems caused by an open neutral?

MrWizard

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Posted: 07/11/12 11:35am Link  |  Print  |  Notify Moderator

#1& #3 same thing no power

#2 will cause varying degres of high voltage across appliances and FRY THEM/BURN OUT


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wa8yxm

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Posted: 07/11/12 11:52am Link  |  Print  |  Notify Moderator

There is one correct answer above.

Open neutral, in the RV, Cord, Plug or Pedistal on 30 amps = OPEN circuit, no power, your 3-light outlet tester will show a good ground but that is the only LIGHT that will LIGHT.

Open elsewhere in the park can, depending on where, cause a lot of fun. *IF* the line is shared with 50 amp rigs. or with other 30 amp rigs on the other leg.

OPEN GROUND puts the chassis of your unit at "Up to 60 volts" depending on so many things I won't list them all. But that is not the neutral.


Home is where I park it.
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Wayne Dohnal

Bend, OR.

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Posted: 07/11/12 11:53am Link  |  Print  |  Notify Moderator

I would think that #2 and #3 are the same situation. In #2, the neutral and one 50 amp leg are connected to behind the pedestal panel. In #3, the same connection is made in front of the panel by the adapter. If there was only one load in the park all 3 scenarios would give no power, but with other rigs plugged in (or outbuildings, lights, etc.) they will be feeding power from a hot line onto the open neutral, so it can attain pretty much any random voltage between 0 and 240. Even in scenario #1, depending on how the park is wired and where other rigs are plugged in, damage could occur. This is kind of a tough situation to picture all at once, so if I have it wrong, I accept any civil corrections.

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