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 > How long can you go on a 50 amp extension cord?

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supercub

Modesto CA

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Posted: 09/30/20 10:13pm Link  |  Quote  |  Print  |  Notify Moderator

How long can you go on a store bought 50 extension cord? I need to run both AC's and lights TV etc, the normal things. Is 100 feet safe? or 75? or 50? or ? It's for a 38 ft Class A diesel.

Was able to measure this morning, total length will be 100. My cord in the motorhome is about 30 ft. My brother in law, already has 40 length to his trailer, which I'll unplug from his trailer that is in storage and plug into that. So I need to get a 30 foot extension, for a total of 100 feet. Yes, I have a surge protector at the motor home too.

* This post was edited 10/01/20 09:14am by supercub *

rk911

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Posted: 09/30/20 10:18pm Link  |  Quote  |  Print  |  Notify Moderator

i've personally done 50'...25' on the primary cord and another 25' on a 50-amp extention but it was fall and no need for either AC. as i recall there was no significant voltage drop in the coach. i keep a digital meter plugged in that displays voltage and cycles. i guess it woukd depend on the quality of the cords.


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wopachop

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Posted: 09/30/20 10:44pm Link  |  Quote  |  Print  |  Notify Moderator

supercub wrote:

How long can you go on a store bought 50 extension cord?
Do you have several home depots and lowes around? Go early morning to the electrical section. You might get lucky and find cable that was returned and on sale. You would pretty much build your own somewhat budget extension cord. I got an Uglys book in my truck somewhere. Couldnt tell ya off hand what size wire to do 100 feet at 50amps.

pianotuna

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Posted: 09/30/20 10:44pm Link  |  Quote  |  Print  |  Notify Moderator

Rich,

It depends more on the size of the wire.

SuperCub the entire run from the house panel to the RV needs to be considered. There are tables and voltage drop calculators that would give you a good idea of how thick the wire would need to be.

https://www.southwire.com/calculator-vdrop


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Posted: 09/30/20 10:57pm Link  |  Quote  |  Print  |  Notify Moderator

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supercub

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Posted: 09/30/20 11:00pm Link  |  Quote  |  Print  |  Notify Moderator

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Ed_Gee

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Posted: 09/30/20 11:01pm Link  |  Quote  |  Print  |  Notify Moderator

I see no reason whatsoever why you can't run your RV on a 100' 50A extension ..... but do you have any idea how heavy that is going to be? I believe 50A cable is 6AWG. That is going to weigh a ton! I built a 100' 30A cable for my previous ClassA.....out of 10AWG cable from Home Depot....worked great but a bit of a pain to coil up and store.... A properly sized 50A cable is going to be a lot worse.......but again, yes, it will work fine.


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wopachop

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Posted: 09/30/20 11:15pm Link  |  Quote  |  Print  |  Notify Moderator

supercub wrote:


I'm trying to plug into a house with 50 amp plug. Thanks
Have someone measure the distance. Every 25 feet makes a big difference.

Even if someone was to count steps that would be just fine for an estimate.

After you post that distance number people can tell you what size wire you need.

time2roll

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Posted: 09/30/20 11:42pm Link  |  Quote  |  Print  |  Notify Moderator

100' is fine. If you will be in this place often I would consider making a custom cord of the correct length.


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Old-Biscuit

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Posted: 09/30/20 11:44pm Link  |  Quote  |  Print  |  Notify Moderator

100' with 50A #6 power cord 40A load will have roughly a 3-4 Volt drop from source to RV
120VAC....116/117VAC


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