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"farmers three way" question here #4916 10/23/01 11:38 AM
Joined: Oct 2001
Posts: 77
T
Tiffany Sparks Offline OP
Member
received this in email today.......take it away guys.....this is way over my head.
Thanks.
Tiff

I am looking for information on old wiring called a farmers 3-way.
This is for a school project.
I need to know how to hook up a 3-way switch in a house,a 3-way switch and
a 110 v recepticle in a barn.
The switches will operate a yard light and the recepticle has to be hot all
the time.
There are no ground wires and only 3 wires can be ran from the house to the
barn.

Work Gear for Electricians and the Trades
Re: "farmers three way" question here #4917 10/23/01 12:13 PM
Joined: Oct 2001
Posts: 19
R
rbiro Offline
Member
Does this work?

Hot--------\-------------------/-------+
_____3_way__\_(Red)___Light___/_3_Way||Outlet
Neutral----/-------------------\-------+

Pardon my lake of artistic ability.

[This message has been edited by rbiro (edited 10-23-2001).]

Re: "farmers three way" question here #4918 10/23/01 12:25 PM
Joined: Oct 2001
Posts: 597
E
ElectricAL Offline
Member
The key to this idea is that it is old. I occasionally see this in the main stairwell of early 1900 two story single family dwellings wired with Knob and Tube. The original service was 120 volt only and a lighting circuit went to each floor (or there was only one lighting circuit for both floors). The main stairwell light is not polarized (like I said - OLD [Linked Image]. The lamp screwshell is connected to the common of one threeway, and contact tab is connected to the common of the other threeway. The threeway travelers, at the top and bottom of the stairs are connected to the closest available hot and neutral. No concern is shown for cross neutralling (is that a word?) two circuits.

I generally get a call when the home owner has tried to replace a worn switch and gotten the common on the wrong wire. . .always blows the breaker.


Al Hildenbrand
Re: "farmers three way" question here #4919 10/23/01 01:30 PM
Joined: Oct 2000
Posts: 2,749
Joe Tedesco Offline
Member
Look for California 3-Way Diagrams

[This message has been edited by Joe Tedesco (edited 09-06-2002).]


Joe Tedesco, NEC Consultant
Re: "farmers three way" question here #4920 10/23/01 01:33 PM
Joined: Mar 2001
Posts: 2,056
R
Redsy Offline
Member
Look under our Electrical Theory Topics for a topic called "4wire feed for 3 way switching". I think it is the same concept.

Re: "farmers three way" question here #4921 10/23/01 03:35 PM
Joined: Apr 2001
Posts: 21
M
Merritt Offline
Member
i believe this is known as the carter system... atleast thats what ive read in books... it works by switchking both hot and neutral, so you have one less traveller... its rigged, but works

-m


Remember when you read my posts, im only 17, still learning... "Hey, its takes what it takes!"
Re: "farmers three way" question here #4922 10/23/01 04:40 PM
Joined: Aug 2001
Posts: 142
B
bordew Offline
Member
Merrit
Thats the name I have heard it called, also the lazy Neutral.
Also there are more of them out there than you think. K & T were famous for them and even into the late 30's older electricians still used them at that point, in(at that time new construction).
This summer I rewired a house that had 15 of them with 4-ways, except for the switching, Carter system, the minimum size wire was No. 12 old romex, the guy spared no expense, in 1936, but even then that system was against code.

Re: "farmers three way" question here #4923 10/23/01 06:06 PM
Joined: Oct 2000
Posts: 5,389
S
sparky Offline
Member
http://www.hometoys.com/htinews/apr98/articles/kingery/kingery8.htm
Here's a link, check fig#7... looks like what's being described ( Bordew, I get these links from the BB's, just obligated to pass them on...)

I would think your best( Nec Legal) option for only a 3 -wire would be automation ( X-10) controls.
[Linked Image]

Re: "farmers three way" question here #4924 10/24/01 11:21 AM
Joined: Oct 2001
Posts: 77
T
Tiffany Sparks Offline OP
Member
Thanks very much for the help.
That was exactly what I was looking for.

Tiff

Re: "farmers three way" question here #4925 07/28/02 10:08 AM
Joined: Oct 2000
Posts: 2,749
Joe Tedesco Offline
Member
........?

[This message has been edited by Joe Tedesco (edited 09-08-2002).]


Joe Tedesco, NEC Consultant
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