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Old 07-29-2013, 07:51 AM   #21
MarkS
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Thanks PND,

Some of the things I have read made me wonder if I understood how the pedestal was wired. Also, I was not sure if RV parks typically got residential style split phase or commercial 3 phase from the pole.
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Old 07-29-2013, 09:33 AM   #22
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OK. The parks are probably feed 3 phase, then they can be broken down to 3 individual single-phase circuits that are then wired as a split-phase system. By splitting the 3-phase into single-phase circuits, we can balance the load to a degree (never exact, but the best we can). There may also be step-down transformers involved, but I'll keep it simple. If the park was prperly engineered there souldn't be voltage drop problems, but we have to remember, many parks were wired years ago, before we (RV'ers) started adding all our "power hunger" camping toys. You know, all the AC we must have, blenders for those umy drinks, the fireplaces inside (electric of course), hair dryers, TV's and on and on. So many parks are underwired for todays fun, and we get undervoltage and problems.

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Old 07-29-2013, 10:44 AM   #23
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Quote:
Originally Posted by PND View Post
OK. The parks are probably feed 3 phase, then they can be broken down to 3 individual single-phase circuits that are then wired as a split-phase system. By splitting the 3-phase into single-phase circuits, we can balance the load to a degree (never exact, but the best we can). There may also be step-down transformers involved, but I'll keep it simple. If the park was prperly engineered there souldn't be voltage drop problems, but we have to remember, many parks were wired years ago, before we (RV'ers) started adding all our "power hunger" camping toys. You know, all the AC we must have, blenders for those umy drinks, the fireplaces inside (electric of course), hair dryers, TV's and on and on. So many parks are underwired for todays fun, and we get undervoltage and problems.

PND
PND -

Not to be argumentative, but I tend to doubt if many RV parks would pay the extra to get 208VAC-3Phase. I would suspect that most parks are getting the standard 240VAC-2Phase sine wave AC that you describe.

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Old 07-29-2013, 12:49 PM   #24
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That is possible for small parks, but I would be willing to bet that they and the larger ones would be three-phase primaries. There is just too much load for a 240 volt single-phase service and a utility (like mine) wouldn't allow it. You have to remember that they are feed from a min. of a 12Kv distrubution system, and some (like mine) are 26Kv. Three smaller pole top or one 3-phase padmount transformer is cheaper to supply than one large single-phase transformer. Local codes dictate how a park must be wired.

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Old 07-29-2013, 01:04 PM   #25
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You said 208/120 volt and the phrase 240 2-phase. 208/120 is a "Y" connected system. You can get 240/120 from a "delta" system with a center tap on a phase. 2-phase systems have not been around since the 70's. We had some and it is a 4-wire system 90 electrical degrees apart. Our most common is the 3-phase 120 electrical degrees apart. Voltage stays at 120 degrees, but the current can shift in relation to its relative phase. Not uncommon to have a referance of 0 degrees for "A" phase voltage, but 180 degrees of "A" phase current. Welcome to my world.

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Old 07-29-2013, 07:21 PM   #26
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50 amp plug for 30 amp trailer

My experience has been with numerous RV Parks using a 50 amp pigtail for my 30 amp trailer is that I get a higher voltage reading than using a 30 amp Hughes Autoformer. I have 3 voltage meters in the trailer. two digital and one analog. I no longer use the 30 amp cord by itself.
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Old 08-01-2013, 01:56 PM   #27
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How much of difference is there. Hard to see how this can happen, but would need to know how the pedestals are wired. So many variables that are unknown to make a guess as to why.

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Old 08-06-2013, 06:04 AM   #28
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Thinking about it for awhile - if the "park" is feeding the pedestals with different transformers for 30 and 50 amp recepticals, that could account for a difference in voltage between the 30 and 50 amp circuits. Again, without seeing an AC elementary of the location, it is hard to see what is causing the voltage difference. Unless you have a transfomer with boost-buck taps, the voltage will vary between transfomers. I have seen as much as 6 volts difference between transfomers.

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