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Open Roads Forum  >  Tech Issues

 > Pulling more than 50 amps ?

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TechWriter

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Posted: 07/30/20 08:32pm Link  |  Quote  |  Print  |  Notify Moderator

Our park electrician says that some of the big rigs with 3 ACs and electric everything can sometimes draw more than 50A from a 50A pedestal.

Truth or BS?


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enblethen

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Posted: 07/30/20 08:37pm Link  |  Quote  |  Print  |  Notify Moderator

Wired properly, BS!


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fcooper

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Posted: 07/30/20 08:50pm Link  |  Quote  |  Print  |  Notify Moderator

100 amps available....50 amps per leg x 2 legs...so answer is yes


Fred & Vicki
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Posted: 07/30/20 08:51pm Link  |  Quote  |  Print  |  Notify Moderator

i've heard of but not seen in person RVs with 100-amp service. connected to a 50-amp post i believe the most a rig like thar could draw would be a bit less than 50-amps else the post CB would trip.


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mobeewan

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Posted: 07/30/20 09:17pm Link  |  Quote  |  Print  |  Notify Moderator

fcooper wrote:

100 amps available....50 amps per leg x 2 legs...so answer is yes


fcooper is right. You are not thinking about how a 50 amp / 240 Volt system works.

You have 2 120 volt legs with 50 amps available on each leg not 25 amps on each leg. 50 + 50 =100 amps of 120 volt power.

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Posted: 07/30/20 09:19pm Link  |  Quote  |  Print  |  Notify Moderator

Three? Each is maybe 16 max so even 4 would pull only 32 per side max.
Licensed electrician or handy man?


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Posted: 07/30/20 09:57pm Link  |  Quote  |  Print  |  Notify Moderator

Stating an amperage without specifying the voltage is really only describing part of the story. More than 50A @ 120V? Sure. More than 50A @ 240V? Sure... for a few seconds until the breaker pops.

Honestly, RV power is listed in kind of a messed up way and it rarely gets clarified. A 30A hookup is 120V. A 50A hookup is 240V. So, if you just want a linear scale for comparison sake, a 30A hookup is 30, a 50A hookup is 100.

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Posted: 07/30/20 10:41pm Link  |  Quote  |  Print  |  Notify Moderator

Park electrician is correct.





pianotuna

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Posted: 07/30/20 11:01pm Link  |  Quote  |  Print  |  Notify Moderator

Add up all the possible loads. Neither leg will exceed 50 amps I suspect--but there are 2 legs.

In winter I can draw more than 50 amps--but it is shared over both legs.


Regards, Don
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Posted: 07/30/20 11:05pm Link  |  Quote  |  Print  |  Notify Moderator

Electrical must always be designed for worst case.

Aside from water heater, reefer and battery recharging it is quite possible for a park power blip to knock all A/C off line. Then all of them may attempt a high head re-start. If the park is nearly full, the park becomes an involuntary appliance durability tester.

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