BB_TX
McKinney, Texas
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Here is a good explanation of 50 amp service.
https://www.myrv.us/electric/
It really is 240 vac 50 amp separated into two 120 vac 50 amp circuits. And most all RVs only use the 120 vac circuits. But some high end RVs do actually have some 240 vac appliances. But since it is protected by a 50 amp two pole linked circuit breaker you must size the wire for 50 amps.
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KD4UPL
Swoope, VA
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50 amp, 240 volt. Don't make it complicated.
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wa8yxm
Davison Michigan (East of Flint)
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If figuring voltage drop for a 50 amp RV
You figure 50 amps.. And don't forget the wire is twice as long as the run.
BUT also remember the drop is split between the two legs.
So you halve the drop for 120 volts.
Example.. Let's say the run is long enough you calculate 1 volt drop each way.
So your total drop at max load is 2 volts.
But the max drop on EACH leg is 1 volt
NOTE: you will never hit max load.. It just does not happen as it would require PERFECT balance.> But that's how you figure it. Just to be safe.
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enblethen
Moses Lake, WA
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CA Traveler gave the correct definition of a 50 amp RV shore power connection.
It is a 120/240 volt four wire system.
Most standard RVs would normally not draw anywhere near 50 amps on each leg.
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BB_TX
McKinney, Texas
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wa8yxm wrote:………
Example.. Let's say the run is long enough you calculate 1 volt drop each way.
So your total drop at max load is 2 volts.
But the max drop on EACH leg is 1 volt
NOTE: you will never hit max load.. It just does not happen as it would require PERFECT balance……….
Not exactly true. It is theoretically possible to pull 50 amps thru leg 1 while simultaneously pulling anything from zero amps to 50 amps on leg 2. Or vice versa. The neutral current would vary accordingly. In which case one leg would have more voltage drop than the other. And if one leg were pulling zero current, all voltage drop would be on the leg actually pulling current. A completely unbalanced load is as unlikely as a perfectly balanced load. Still, the voltage drop will not likely be equally shared.
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stevenal
Newport, OR, USA
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time2roll wrote: The split phase has the advantage of sharing the neutral and reducing voltage drop.
Of course we all carefully balance our loading across the two legs to ensure minimal voltage drop. If I were doing this installation, I would assume the end user would not be that careful. Worst case is 50 A on one leg and neutral, zero on the other leg. 120 V in the formula at twice the distance.
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2oldman
NM
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OP's gone.
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Grit dog
Black Diamond, WA
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2oldman wrote:OP's gone.
You’re probably impatient.
Weather is beautiful in NM right now. Maybe time to get outside.
But yes, as usual, the usual constituents have muddled the discussion, lending little real world help to someone who was/is obviously not very well read on the subject.
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BB_TX
McKinney, Texas
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2oldman wrote:OP's gone.
Happens often.
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2oldman
NM
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BB_TX wrote:2oldman wrote:OP's gone. Happens often. So often that I try to always ask a question first. It saves a lot of typing.
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