Do it Yourself: Fw: [DIY] electric voltage drop to an RV

06 June 2012

Fw: [DIY] electric voltage drop to an RV

Howdy,

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.

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

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----- Forwarded Message -----
From: Dale S <dalu@hbcomm.net>
To: DoIt_Yourself@yahoogroups.com
Sent: Tuesday, June 5, 2012 9:21 PM
Subject: Re: [DIY] electric voltage drop to an RV
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.
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).