There is NO "NEC minimum voltage drop".
Dealing with voltage drop is a suggestion in the NEC, NOT a code required subject.
--- In DoIt_Yourself@yahoogroups.com, "J. D. Brown" <jdb8251@...> wrote:
>
> Howdy,
> Â
> You did not mention the the wire size you are planning to use. At this distance to meet the NEC's minunum voltage drop you are going to need 4/0 THWN cable for this project. If you are going to try to use a B/B transformer then you could drop you could use 3/0 THWN.
> Â
> The very max in voltage drop at the farthest used 120V device can not be more than 5% of connected 120V supply. So at the 700' distance you have spec. your voltage can not be below 119.5 volts.
>
> AGAPE,
> jdb, txredneck
> *****************************************************************************************************
> *****************************************************************************************************
> ----- Forwarded Message -----
> >From: Dale S <dalu@...>
> >To: DoIt_Yourself@yahoogroups.com
> >Sent: Tuesday, June 5, 2012 9:21 PM
> >Subject: Re: [DIY] electric voltage drop to an RV
> >
> >Â
> >
> >Typically a buck and boost will make either a 12.5 VAC or 24 VAC difference. B&B sounds like a sound solution. Unless you are going to have some heavy loads other than AC a B&B may do the job plus you will have a two conductor rather than a three conductor plus Xfmr in the cost.Â
> >Dale in the Flat Lands:----- Politics is supposed to be the second-oldest profession. I have come to realize that it bears a very close resemblance to the first. ~Ronald Reagan
> wired wrote:
> >I apologize that this is a bit technical of a question, but I know a few people here are technical kind of guys.
> >>I am going to run an electric line for a motor home, with aluminum
> wire, a distance of 700 feet. The motor home needs 40 amps 120
> volts.
> >>Voltage drop is a major issue here. My thought is to use a
> transformer to either run 240 volts there and step it down to 120
> volts . Option 2 is use a buck boost transformer to raise the
> 120v. voltage a few volts at the end of the line. What about a
> transformer with a regulator to keep the voltage even in varying
> loads conditions? Please don't worry about my using aluminum wire
> as I know how to properly connect it (I am an electrician). This
> is to be used only occasionally for recreation purposes at a pond
> (city slickers camping out in town).
> >>
> >
>
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