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post #1 of 16 Old Jan 17th, 2010, 12:40 pm Thread Starter
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Electricians....Help Needed

I finally have the option to go with satellite TV vs the cable TV I was stuck with for several years. I currently have an 80' length of RG6 cable running from the house to the TV dish mounted atop my detached garage. I recently finished digging a trench from the house to the garage in which to bury the RG6 cable. I also want to run 120v power from the house to the garage using the same trench containing the RG6 cable. I am planning on using about 80' of #4 Aluminum Underground Service Entrance (USE) cable for supplying power to the garage.

I am concerned the RG6 TV cable may experience interference from the #4 USE cable and cause loss or degradation of the satellite TV signal because the two cables will be laid in close proximity within the trench. I can't seem to get a consistent answer from several sources as to whether my RG6 cable is a "shielded" cable; the exact description taken from the cable's outer sheath reads as: Vextra V66 RG6 3GHz 75ohm 9700851 18AWG CMX(ETL) C(ETL) LX80021 D383112 FT (011677, 5MT)

I will run the full length of RG6 in1" Gray PVC conduit to protect it from possible damage, but I do not think the PVC conduit will shield the RG6 from an electrical field generated by the #4 USE cable. Because of rocky soil conditions, my trench is only 9"-10" deep and I cannot go any deeper without incurring the costs of blasting.

Will Rigid metal conduit or metal EMT conduit protect the RG6 from an electrical field, or would running the RG6 and the #4 USE in separate runs of PVC conduit (and burying the runs 5"-6" apart) do the trick?

What would be the best method of protecting the RG6 from inteference from the other cable?

Any advice/suggestions are greatly appreciated.

Last edited by DakotaDude; Jan 17th, 2010 at 12:47 pm.
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post #2 of 16 Old Jan 17th, 2010, 12:55 pm
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Re: Electricians....Help Needed

The RG6 is definately a shielded cable. As long as your AC line is twisted I don't think you'll have too much trouble.

I'm running about 300' between the house and shop. 2 PVC conduits in a 3' deep trench. Conduits laying ON each other.
Using 4/0 cable in a 2" PVC for the 220V and in the other 1" I have an RG6 Two runs of Cat5 a phone line and a couple twisted 20GA for low voltage stuff.

I'm not experiencing any issues...afaict

John

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post #3 of 16 Old Jan 17th, 2010, 6:57 pm
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Re: Electricians....Help Needed

RG6 IS shielded.

Run them in their own PVC conduits and I think yo will be just fine.

If for some reason you do experience interferance, you have the RG6 in conduit, be easy to pull out and pull in something better but doubt you will.

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post #4 of 16 Old Jan 17th, 2010, 8:14 pm
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Re: Electricians....Help Needed

My son in law is a Cable Technician, and says that they almost always use RG11 when going any distance underground. Takes different fittings, but they are available. RG11 is available in three or four configurations, one is for direct burial.

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post #5 of 16 Old Jan 17th, 2010, 9:37 pm
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Re: Electricians....Help Needed

Quote:
Originally Posted by gunny
RG6 IS shielded.

Run them in their own PVC conduits and I think yo will be just fine.

If for some reason you do experience interferance, you have the RG6 in conduit, be easy to pull out and pull in something better but doubt you will.
In addition to the nominal cooper braid shield RG6 also has an aluminum shield. You need the proper crimping tools to use the "F" type connectors from the Sat dish LNC to the other end . . . your Sat receiver.

If you don't feel comfortable making the connections, take your cable lengths to a shop that has the proper tools and connectors and have the tech there install the cable connectors.




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post #6 of 16 Old Jan 18th, 2010, 5:19 am
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Re: Electricians....Help Needed

Quote:
Originally Posted by PMitchell
In addition to the nominal cooper braid shield RG6 also has an aluminum shield. You need the proper crimping tools to use the "F" type connectors from the Sat dish LNC to the other end . . . your Sat receiver.

If you don't feel comfortable making the connections, take your cable lengths to a shop that has the proper tools and connectors and have the tech there install the cable connectors.
oops . . . should be LNA (low noise amplifier) at the dish location.

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post #7 of 16 Old Jan 18th, 2010, 7:15 am
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Re: Electricians....Help Needed

Quote:
Originally Posted by dshealey
My son in law is a Cable Technician, and says that they almost always use RG11 when going any distance underground. Takes different fittings, but they are available. RG11 is available in three or four configurations, one is for direct burial.
David, is RG11 heavier cable or just shielded better?

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post #8 of 16 Old Jan 18th, 2010, 7:45 am
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Re: Electricians....Help Needed

Those screw on, or crimp on pictured are old style connectors no longer used by professionals or cable/satellite companies. Any good tech uses compression fittings now. Like these: http://www.mjsales.net/items.asp?Fam...D=38&Cat3ID=31
Or these for RG11: http://www.mjsales.net/items.asp?Fam...D=38&Cat3ID=31

They are sealed when installed, and force the shield into contact 360 degrees around the connector. They take a different type of tool, several different ones available, here is one that I have: http://www.mjsales.net/items.asp?Fam...D=39&Cat3ID=32

Home Depot and Lowes both now sell compression fittings and tools:

http://www.homedepot.com/h_d1/N-5yc1...atalogId=10053

When using RG6, for best service (especially with Satellite) use "Quad Shield".


Quote:
Originally Posted by PMitchell
In addition to the nominal cooper braid shield RG6 also has an aluminum shield. You need the proper crimping tools to use the "F" type connectors from the Sat dish LNC to the other end . . . your Sat receiver.

If you don't feel comfortable making the connections, take your cable lengths to a shop that has the proper tools and connectors and have the tech there install the cable connectors.




I don't want to achieve immortality through my work...I want to achieve it through not dying.

David Shealey
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post #9 of 16 Old Jan 18th, 2010, 7:50 am
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Re: Electricians....Help Needed

Quote:
Originally Posted by jayjacobson
David, is RG11 heavier cable or just shielded better?
Both.

Satellite systems are more sensitive to cable and fitting issues than Cable, due to the very high frequency.

I don't want to achieve immortality through my work...I want to achieve it through not dying.

David Shealey
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post #10 of 16 Old Jan 18th, 2010, 8:59 am
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Re: Electricians....Help Needed

Quote:
Originally Posted by dshealey
Both.

Satellite systems are more sensitive to cable and fitting issues than Cable, due to the very high frequency.
+!
As well as the low signal levels . . .

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post #11 of 16 Old Jan 19th, 2010, 2:19 am
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Re: Electricians....Help Needed

Quote:
Originally Posted by dshealey
Both.

Satellite systems are more sensitive to cable and fitting issues than Cable, due to the very high frequency.
Ok great. I'll use it if I ever need to string cable.

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post #12 of 16 Old Jan 19th, 2010, 6:13 am
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Re: Electricians....Help Needed

Quote:
Originally Posted by jayjacobson
Ok great. I'll use it if I ever need to string cable.
Most cable and satellite companies use RG6 Quadshield for all indoor runs, but as I said earlier, RG11 is used for most underground runs, and sometimes long runs between distribution hubs in buildings.

I don't want to achieve immortality through my work...I want to achieve it through not dying.

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post #13 of 16 Old Jan 20th, 2010, 7:17 pm Thread Starter
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Re: Electricians....Help Needed

Thanks to all for the help. I will use 2 separate runs of PVC for the two cables and call it good.
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post #14 of 16 Old Jan 20th, 2010, 9:27 pm
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Re: Electricians....Help Needed

Something else to think about: During my cat 5e and Coax "home run" house wiring project, I learned that not all RG6 coax is the same. Satellite dish runs apparently need a solid copper core center (opposed to copper plated steel core) conductor to support 2gz or better. I am by far not an expert in the area and learned this from my google searches which I encourage you to do also.

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post #15 of 16 Old Jan 21st, 2010, 1:23 pm
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Re: Electricians....Help Needed

Quote:
Originally Posted by jhsonderb
Something else to think about: During my cat 5e and Coax "home run" house wiring project, I learned that not all RG6 coax is the same. Satellite dish runs apparently need a solid copper core center (opposed to copper plated steel core) conductor to support 2gz or better. I am by far not an expert in the area and learned this from my google searches which I encourage you to do also.
Interesting since RF (radio frequency) energy is transmitted via the "skin effect" or surface conductance of the wire conductor until it is radiated. Perhaps at the shorter wavelengths this is not the case.
But this chart seems to reinforce that the higher the frequency the less "skin " conductor (copper, silver, or gold) thickness is needed


Perhaps methinks that the cable companies want to sell more expensive cable?

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Last edited by PMitchell; Jan 21st, 2010 at 3:48 pm.
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post #16 of 16 Old Jan 21st, 2010, 3:15 pm
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Re: Electricians....Help Needed

Quote:
Originally Posted by jhsonderb
Something else to think about: During my cat 5e and Coax "home run" house wiring project, I learned that not all RG6 coax is the same. Satellite dish runs apparently need a solid copper core center (opposed to copper plated steel core) conductor to support 2gz or better. I am by far not an expert in the area and learned this from my google searches which I encourage you to do also.
At high frequencies, current travel is on the surface of a conductor, so the core of the conductor has little affect. I have not seen RG6 that had a plated steel conductor, so was now aware this was an option.

If you use RG6 QuadShield, that is the better quality one anyway.

I don't want to achieve immortality through my work...I want to achieve it through not dying.

David Shealey
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EX: '01 Black LT, BAT BYKE (Totaled at 110,000 miles)
IBA SS, BB, BBG, 10/10ths.
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