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Open Roads Forum  >  Tech Issues

 > Wire gauge for a 200 ft run on 30 amps or 50 amps?

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Lynnmor

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Posted: 02/12/21 01:22pm Link  |  Quote  |  Print  |  Notify Moderator

2oldman wrote:

advice.


Thank you for that, I cringe whenever I see this and it reminds me of the state of education in America.





gbopp

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Posted: 02/12/21 01:23pm Link  |  Quote  |  Print  |  Notify Moderator

It's always nice to get good advice, as long as the person giving the advice is qualified to advise you on how to do it properly. [emoticon]
I agree, use heavy wire and do it right the first time.

time2roll

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Posted: 02/12/21 01:40pm Link  |  Quote  |  Print  |  Notify Moderator

Yes 3% although for a dedicated RV you can probably size it for 35 to 40 amps but not less than #6.
Definitely go 4 wire 120/240 circuit.


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valhalla360

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Posted: 02/12/21 01:46pm Link  |  Quote  |  Print  |  Notify Moderator

Google voltage drop calculator.


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map40

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Posted: 02/12/21 01:51pm Link  |  Quote  |  Print  |  Notify Moderator

Lynnmor wrote:

2oldman wrote:

advice.


Thank you for that, I cringe whenever I see this and it reminds me of the state of education in America.


No, no, don't go blaming the state of education in America. Here is the problem: I speak 6 languages and use them frequently, so my phone and computer do not know what I am writing and the autocorrect wants to commit suicide every time I chat with somebody different. You should see it when I go from Spanish to Cantonese...


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ssthrd

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Posted: 02/12/21 02:28pm Link  |  Quote  |  Print  |  Notify Moderator

map40 wrote:

Lynnmor wrote:

2oldman wrote:

advice.


Thank you for that, I cringe whenever I see this and it reminds me of the state of education in America.


No, no, don't go blaming the state of education in America. Here is the problem: I speak 6 languages and use them frequently, so my phone and computer do not know what I am writing and the autocorrect wants to commit suicide every time I chat with somebody different. You should see it when I go from Spanish to Cantonese...


That would be horrible...........

Old story about a Ferrari owner who had a mechanical problem, and couldn't decide whether he should consult a mechanic who just graduated from Ferrari School, or the old guy down the street who was "uneducated" but has been working on Ferraris for 30 years. Hmmmmmm....... Wonder what he did.

Sorry to get sidetracked. Couldn't resist.


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Gdetrailer

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Posted: 02/12/21 03:22pm Link  |  Quote  |  Print  |  Notify Moderator

Old-Biscuit wrote:

3% Max Voltage drop for that 200' run

Otherwise you will have Low Voltage any time the supply voltage drops below 115V


50A #1AWG
30A #3AWG

Do NOT scrimp on the wire size...........


Agree with not scrimping on the wire but might get sticker shock when you get the prices for this..

#1 AWG copper single strand is going for around $1.90 per ft

For 50A 240/120 you will need 3 runs of #1 (two HOT and 1 Neutral) and 1 run of #3 (for ground)..

I suspect by the time you buy wire, conduit and other needed materials you will be north of $2,500 and if not doing the work trenching and installing conduit that labor cost could easily get you well above $3500..

I would suggest, finding a closer spot nearer to your electrical source that could knock off 100 ft of wire which would get your cost a bit more reasonable..

Alternately, nothing says you HAVE to breaker it for 50A, you could run 240/120 but use a lower amperage breaker like a 30A double instead of 50A double. That would allow you to use lighter ga wire..

ktmrfs

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Posted: 02/12/21 03:26pm Link  |  Quote  |  Print  |  Notify Moderator

naturist wrote:

I'll second what @Old-Biscuit said. Don't scrimp on wire. As wire is expensive in those sizes, it is none the less the cheapest part of the whole deal, when you consider also the just the hassle of blown fuses/breakers, brown-out damaged gear, etc.


x2. the other consideration for going for a 3% drop is the implications of any inductive load such as an AC motor, like your air conditioner. starting current for that could be 50-70A or so momentarily. with to small a wire size, voltage drop can be large enough to turn that momentary draw into many seconds, or even having the motor stall and not start due to voltage drop and if your lucky only pop the breaker.


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MEXICOWANDERER

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Posted: 02/12/21 04:17pm Link  |  Quote  |  Print  |  Notify Moderator

A pair of 600 volt transformers Major reduction in wire cost.

garym114

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Posted: 02/12/21 04:57pm Link  |  Quote  |  Print  |  Notify Moderator

Use the calculator at the bottom of this page. It gives you the voltage drop.
https://www.powerstream.com/Wire_Size.htm


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