R12RTee
Full Timing out of Sarasota, FL
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I'm staying at an older RV park on the east coast for the summer. The park only has 30 amp service and the voltage goes from 104 volts in the afternoon and up to 134 volts in the early morning. I have the Progressive Ind. EMS-HW50C hard wired in and the Hughes Autoformer at the post.
My question is why does the L2 side show higher voltage than the L1? In the mornings, at about 0530, the L2 side will show up to 134 V. and the EMS will shut down the power with a E5 error code. At the same time L1 will be reading well withing range, usually around 121 V. What causes the different reading coming from the same 30 amp service at the post?
This was occurring before I added the Autoformer so I can rule that out.
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past-MIdirector
Michigan
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Unbalanced loads on the lines. This can be caused by the camp ground having more rigs wired to one line than the other. This can also be caused by bad transformer, corroded connections, old wires, and lines touching trees in the area.
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jim87vette
Arizona
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I agree with the above post.Your protected well with what you have.They(electrician) probably saved a bunch of money by not balancing the loads properly or they just did a bad job..but it will hurt/cost them down the road.
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MrWizard
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are you reffering to hot and neutral as L1 and L2
and you reading theses to ground
load source is hot to neutral that is the voltage you need to be concerned about
grd is a saftey, it is not part of the load circuit
you could disconnect grd and everything would still work
i'm not saying do that
i'm saying its not part of the circuit
fluvuations in reading to grd could be caused by any number of reasons
* This post was
edited 07/09/12 08:22am by MrWizard *
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jim87vette
Arizona
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MrWizard wrote:ok somebody is confused, either you or me
30 amp service is 120 volts , readings should always be hot to neutral
you appear to reading hot to grd and neutal to grd
and no way should you be reading 120 or 130+ between neutral grd
and if you are reading 130+ volts between hot and neutral while reading 120v between hot an grd
what do you read from grd to neutral
me i would put the autoformer between the post and the ems
that way the xfrmr can do its job and regulate voltage and the surge guard won't be shutting off
Your correct.I was thrown off by Leg 1 and 2?But if that was the case he would of fried something after the panel in the RV?Or with the surge Protection it would not work at all?
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MrWizard
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i edited my post see above
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smkettner
Southern California
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If you are on 30 amps 120v service then you have a problem in your RV or the 50 amp adapter.
Poor neutral connection in the RV would be my first guess.
Are you running anything when you have the imbalance? Turn the item off does it equalize?
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CA Traveler
The Western States
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The poster has a 13V difference from the 30/50 adapter to the PI unit. That is a lot considering that everything except the adapter is normally 6ga wire.
I suspect the adapter, 50A plug or a bad connection. Even a 30A load on one leg and 0A on the other should not create that difference on L1/L2 in the 50A wiring.
The PI unit is also doing it's job flagging the high park voltage of 134V with the E5 code.
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CA Traveler
The Western States
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OP How long is the 6ga wire from the 50A plug to the PI unit? Normally the power cord is 25-30' plus the rig wiring to the PI unit.
And the 50A wire is 6ga - right?
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teddyu
Enfield, Ct
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R12RTee,
I'm sure you are using a 50A/30A adapter which means both L1 and L2 are receiving power from 1 30A line on the pedestal. My guess is that the readings are coming off of the EMS display. The voltage difference is due to the current imbalance inside the MH. Bet your seeing something like 15A on L1 and 0A in L2. The power company probably jacks the voltage up in the early morning anticipating the increased loads on the grid, thus the high readings. They lower the voltage on the grid in the evening once the loads goes away. JM2cents...
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