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Country Discussion Topics
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Jimbob-got a question
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genenky    Posted 03-04-2003 at 03:18:42       [Reply]  [Send Email]
i plan on running a new electric line underground to the barn. can i also put a telephone line in the same conduit or will the electricity cause static in the phone . thanks gene n ky


Jimbob    Posted 03-04-2003 at 18:23:52       [Reply]  [No Email]
Buy direct burial telephone cable. It has a thin copper jacket that acts as a shield. Never install telephone in the a power conduit. I would not even run it in the same trench being I do not know your local codes as enforced by your local electrical inspector. I have never seen power & telephone share a trench on residental property. I have shared a trench for industrial applications that was in an underground duct bank with conduits incased in concrete for industrial applications.


willie    Posted 03-04-2003 at 06:56:54       [Reply]  [Send Email]
worked telephone lines when I did my Air Force hitch. Military specs, adaped from Bell/REA specs, 4 feet overhead seperation, underground either 12 inches dirt with 2x6 plank to prevent accidental contact with shovel, or 3 inches concrete. This to prevent induction voltage on the telephone. Imagine the surprise when a phone tech (low voltage)gets bit by 440.GOLLY-GEE WHIZ,THAT SMARTS!!!!!!!!! Been there, done that.
Willie


Willy-N    Posted 03-04-2003 at 07:03:19       [Reply]  [No Email]
The 4 ft rulling is for high voltage on the poles not the 120/ 230 volt house drops or secondary lines off the transformers. So many different rules with all kinds of variables, areas city/county and state rules. All of them can up grade the National Electric Code but never degrade them. Mark H.


Willy-N    Posted 03-04-2003 at 06:36:48       [Reply]  [No Email]
NO you can not put the phone wire in the same conduit with the power. You can put it in the same ditch as long as you keep it seperated by 18 innches of fill above or along the side. Also depends on the area you are in and the inspectors descresion he has a little un/writtin rule for him to make up his own mind. Mark H.


walt    Posted 03-04-2003 at 05:09:49       [Reply]  [No Email]
I have some underservice to my house. The electrical inspector told me no sharing of the ditch because they don't want anyone else digging in the same ditch if repairs have to be made to the non-electrical lines.


Lazy Al    Posted 03-04-2003 at 04:48:04       [Reply]  [No Email]
Your not even suppose to run them thru the same hole in the studs when wiring a house. All wires
in a conduit are to be insulated to the highest
voltage . I would think you might getting static
on the phone line . Maybe like a 60 cycle hum .
There probably are several reasons .
I wojld put it in a separate 3/4 line or buy
direct burial phone line and go that route.
Al


Red Dave    Posted 03-04-2003 at 04:21:22       [Reply]  [No Email]
If you have to get it inspected, your inspector may not like to see power and phone in the same conduit. Some jurisdictions don't allow it.
I've done it though, and didn't have a problem with it.


Salmoneye    Posted 03-04-2003 at 03:42:50       [Reply]  [Send Email]
I am no electrician (by a long shot), but...

Around here I know that when they hang lines from the road to the house, there is supposed to be 18 inches between the phone and the power lines...

I have been told that the same applies undergound, but that distance is less due to the dirt being in between the lines...Believe I was told 6 inch minimum between them with dirt in between...

What I was told anyway...

What I was told anyway...


Stan ETenn    Posted 03-04-2003 at 11:26:27       [Reply]  [Send Email]
Salmoneye, same in SE US. Most bellsouth inside wire is twisted to prevent induction. Most base cords are run flat, side by side. When you put two lines on a 4 conducter cord they will induce to each other. Buried wire is twisted also. Shouldn't induce. Most aerial wire will induce if there is any imbalance.


Willy-N    Posted 03-04-2003 at 06:29:00       [Reply]  [No Email]
Your correct on that one. Most underground phone cable is sheilded with rodent armor metal sheild. Mark H.


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