Pulling more than 50 amps ?
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?
Forum Discussion
hypoxia wrote:
On an RV that has zero 240 volt appliances is there a reason to have the tied 50 amp breaker instead of two separate 50 amp breakers?
Yes but it is highly technical But I try again:
Assume that between transformer and you is a 2 volt drop each way at 50 amps (At 100 amps that's 4 volts each way)
Now that means 120 volts at the transformer or no-load = 112 full load OUCH that's some serious voltage drop.
Now let's split it to two 50 amp legs. Right away the voltage drop one way goes from 4 to 2.. but wait there's more
IF just one leg is in use we have 2 volts out and 2 back for 116 volts at the RV
But if both legs are in use we have 2 volts out and 2 back for 118 volts at the RV.. Why? Well the 4 volts round trip comes off the 240 volts and that's divided so ..
It means way smaller cables are needed for the same voltage drop
Makes 100% sense
I hope I've explained it well enough but if not.. Pleas ask about the confusing parts and I'll try to clarify.
Alas... THis is what is called "College level" stuff. or intutitive depending on what you studied in college :)
