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 > informational symptoms of bad 50A electric post

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Double W

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Posted: 08/22/12 11:42pm Link  |  Print  |  Notify Moderator

Pulled into Stubb Stewart State Park in NW OR and hooked up. Monitor read 50 amps and everything worked. Got up the next morning and turned on the coffeepot. A few minutes later pushed down the toaster and everything died. Batteries were down to 11.8V. System shutdown, b ut AC's both still worked. Checked all the fuses, inverter fuses, etc. Started the gen and everything worked including the batt charger. Finally scratched my head and called Monaco LLC. Tech told me to check that the post was hot on both sides (even tho the system monitor still read 50A). Asked the local ranger to check the post... and they found that one side was dead. Now it


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Executive

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Posted: 08/22/12 11:55pm Link  |  Print  |  Notify Moderator

That's why it's important to know exactly what's in the pedestal box BEFORE you plug in. There's an easy to make tester, see link below, with parts readily available from your local Home Depot. I made one in about 45 minutes....check it out...Dennis

50 amp tester


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byronlj

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Posted: 08/22/12 11:56pm Link  |  Print  |  Notify Moderator

You might want to check your CB panel to see how it is wired for load balance. Most manufacturers don't hook up both AC's to the same hot leg of a 50a circuit.
Dave


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Big Katuna

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Posted: 08/23/12 05:37am Link  |  Print  |  Notify Moderator

What kind of monitor do you have that said your 50 was good?


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brobox

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Posted: 08/23/12 05:55am Link  |  Print  |  Notify Moderator

Excellent idea Dennis!

Double W, do you have an Electrical Management System wired in your MH? Mine will not let power into the MH until it passes inspection.


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garym114

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Posted: 08/23/12 06:15am Link  |  Print  |  Notify Moderator

With a Multimeter


50 amp

The voltage between Y and X should be 240-Volt.
X and W, 120-Volt - Y and W, 120-Volt
X and G, 120-volt - Y and G, 120-volt
W and G, 0-Volt



30 amp

The voltage between the Hot lead at 7 o'clock and neutral, 120-volt Hot lead and G, 120-volt
Neutral and G, 0-volt

Get a multimeter and learn how to use it.

* This post was edited 08/23/12 06:47am by garym114 *


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rgatijnet1

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Posted: 08/23/12 06:46am Link  |  Print  |  Notify Moderator

The only problem with a multimeter reading on a park post is that it just tells you if there is any voltage present at all. It does not tell you if the pole outlet has the capacity to furnish the amperage that you may need. In other words, if a single strand of a wire makes contact in a loose connection, you will read the correct voltage but that single strand cannot supply 50 amps of current.
We all are familiar with the problems we can have in our coach if a battery connection is loose or corroded. The same thing can happen at a RV park pole. This is where a good EMS is necessary. This will not only confirm the presence of voltage and the correct polarity, but it will also alert you if one leg cannot supply the voltage/amperage needed for proper operation.

PandK

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Posted: 08/23/12 06:56am Link  |  Print  |  Notify Moderator

I like the tester Dennis has a link to.
My personal preference is the Progressive Industries unit which will constantly monitor the incoming voltage. Saved us several times.

Check here

* This post was edited 08/23/12 07:55am by PandK *


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wny_pat

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Posted: 08/23/12 08:28am Link  |  Print  |  Notify Moderator

Double W wrote:

Now it
"Now it" what. The rest of the story please.


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wa8yxm

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Posted: 08/23/12 09:24am Link  |  Print  |  Notify Moderator

I agree with the NOW it.... NOW IT WHAT.

As for the home made tester, Nice device but I need one that monitors INLINE.

If I can talk my wife into cutting out a day early I'll get the parts but my plan is this.

I have an autoformer, installed, I will replace the box on the outlet part of the install kit with a slightly larger one and install two fused transformers (Very small fuse) 12 volt No reason do do this save for I'd rather play with 12 volt. One will be X-W one Y-W. These will run to a pair of AC-Voltmeters. I may also meter some other stuff just for fun. Include a NEON indicator from W to G as well (posibly from X and Y to G as well) Combining all functions in one indicator box.

These will measure IN USE voltages. PRE autoformer no less.


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