Good Sam Club Open Roads Forum: Pulling more than 50 amps ?
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 > Pulling more than 50 amps ?

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fj12ryder

Platte City, MO

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Posted: 07/31/20 07:32am Link  |  Quote  |  Print  |  Notify Moderator

dougrainer wrote:

Mont G&J wrote:

Park electrician is correct.


Park Electrician is a ignorant idiot. 50 amp service is 100 amps TOTAL supply. 50 amp service on EACH LEG. Doug
Okay, I'm confused. What's the difference between what you're saying "100 Amps total" and what the park electrician said "more than 50 Amps from the pedestal"?


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Bill.Satellite

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Posted: 07/31/20 07:46am Link  |  Quote  |  Print  |  Notify Moderator

If you look at a 50 amp breaker you will see that it is actually 2 breakers tied together so that if either side trips (exceeds the 50 amp load) both sides trip. Now it can trip if you are too close to 50 amps for too long but the theoretical load is 50 amps from each breaker.
Another way to understand 30 amp vs. 50 amp service is to understand the total watts available. 30 amp service is 30 amp x 120V = 3600 watts. 50 amp service there are 2 separate 50 amp "legs" for a total of 100 amp. 100 amps x 120V = 12000 watts available.


What I post is my 2 cents and nothing more. Please don't read anything into my post that's not there. If you disagree, that's OK.
Can't we all just get along?

Lynnmor

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Posted: 07/31/20 07:47am Link  |  Quote  |  Print  |  Notify Moderator

Calling the guy an ignorant idiot is just plain wrong. It is entirely possible that a large RV with 3 AC's to draw more than 50 AMPs on one leg. An RV with 3 AC's probably has a laundry, large refrigerator and possibly a dishwasher and numerous other appliances. It doesn't matter how much the other leg is drawing, the breaker trips if just one exceeds 50 AMP.





enblethen

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Posted: 07/31/20 07:50am Link  |  Quote  |  Print  |  Notify Moderator

Rig could potentially draw 100 amps over both legs. The rig should be wired to put less then 50 amps on each leg. The system is design with load calculations done at 120/240 volts.
Old campgrounds in some cases do not have a properly wired 120/249 volt system. They modified a 120 volt system by connecting both terminals to the same leg. This can overload and can cause damage to the neutral conductor in the shore power cord assembly.
The 50 amp 120/240 circuit breaker could trip if voltage drops increasing amperage.
Calculations followed by true amperage readings is the only way to know for sure.
Some larger rigs have power center that can tell what amperage is being drawn.


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Charlie D.

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Posted: 07/31/20 08:17am Link  |  Quote  |  Print  |  Notify Moderator

Lynnmor wrote:

Calling the guy an ignorant idiot is just plain wrong. It is entirely possible that a large RV with 3 AC's to draw more than 50 AMPs on one leg. An RV with 3 AC's probably has a laundry, large refrigerator and possibly a dishwasher and numerous other appliances. It doesn't matter how much the other leg is drawing, the breaker trips if just one exceeds 50 AMP.


Would not the AC be divided and not all on one leg?


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BB_TX

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Posted: 07/31/20 08:18am Link  |  Quote  |  Print  |  Notify Moderator

I would not be surprised at all if some of the large very high end MHs with 3 A/Cs and mostly all electric for everything else could easily pull over 100 amps and exceed the 240vac/50 amp park supply. 3 A/Cs, larger microwaves, induction cooktops, residential fridge, freezers, multiple TVs, high end home theater systems, washer/dryer, etc. along with all the other more common electrical features and that is a lot of power.

I would believe the park electrician.

wapiticountry

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Posted: 07/31/20 08:25am Link  |  Quote  |  Print  |  Notify Moderator

Or perhaps the park electrician was attempting to explain why a 50 amp breaker was tripping and he didn't use exactly correct grammar. It is entirely possible for large rigs to have appliances and systems that would draw over 50 amps if all the appliances were operating at the same time and the breakers (either the park's or the coach's main) did not trip. Saying that those rigs can draw more than 50 amps is entirely correct. However, if the breakers are working correctly the coach cannot draw more than 50 amps for more than a few seconds. (subject to the tolerances allowed in manufacture and the delays built into the specifications of the breaker). The campground electrician was probably correct in what he was attempting to communicate, even if his verbiage was less than 100% accurate.

time2roll

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Posted: 07/31/20 08:26am Link  |  Quote  |  Print  |  Notify Moderator

12,000 watts sure. 100 amps on any wire would trip the breaker.

Otherwise you may as well talk in battery power and say it pulls 1000 amps [emoticon]


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Lynnmor

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Posted: 07/31/20 08:56am Link  |  Quote  |  Print  |  Notify Moderator

Charlie D. wrote:

Lynnmor wrote:

Calling the guy an ignorant idiot is just plain wrong. It is entirely possible that a large RV with 3 AC's to draw more than 50 AMPs on one leg. An RV with 3 AC's probably has a laundry, large refrigerator and possibly a dishwasher and numerous other appliances. It doesn't matter how much the other leg is drawing, the breaker trips if just one exceeds 50 AMP.


Would not the AC be divided and not all on one leg?


Of course, but there will be at least two on one leg.

pianotuna

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Posted: 07/31/20 09:09am Link  |  Quote  |  Print  |  Notify Moderator

Ask what conditions are necessary to cause a breaker to trip.

There are two ways for breakers to trip. One is thermal where the heat build up from running near or at full capacity for some time causes the trip. The other is a "magnetic" trip where the amp rating is exceeded for a time. We don't want nuisance trips from, for example, start up surge from the air conditioner.

So yes, for brief periods of time, a 50 amp service may exceed the rated values.


Regards, Don
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