bury conduit

Reply to
Don Young
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I just dug a trench to bury some coax cable...thinking of putting it into 2" pvc conduit (in it will be 4 runs of cable...directv).

I'd also like to run electric to a garage at the end of the trench (about 50'), can i run romex in the pvc with the coax? any other tips or suggestions?

Reply to
Billy Thompson

You can get direct burial coax cable and direct burial UF cable for the electric

Reply to
RBM

I may go with direct burial electric cable and then check out your idea for the coax and irrigation pipe...luckily my home wireless network covers my garage!

thanks.

Reply to
Billy Thompson

You really don't want to run power and coax in the same conduit. I just ran a 250 foot run in my church between

2 building to extend internet and telephone from one building to another. Rather than using pvc conduit and glue joints every 10 feet, we used a 300' coil of 1" ID "irrigati> I just dug a trench to bury some coax cable...thinking of putting it
Reply to
Art Todesco

Use seperate conduit for high voltage and low voltage. PVC conduit carrying high voltage should be buried to 18 inches as per NEC. Definitely use conduit if doing this job for yourself. You can always run additional cable later on in the same conduit if necessary.

Reply to
Phil

Keep the runs separate. And a bare minimum of 1' between the "power" lines and the coax. Induction currents can happen in "dirt".

Using some type of metallic conduit for at least one of the runs will help too or even just wrapping them in some tinfoil before you cover them

AMUN

Reply to
Amun

Bullshit. The only reason utilities have separation is so they don't dig up each other's stuff.

Reply to
gfretwell

I buried some 12v (but low current) coax for elements of a MW phased array

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shows two elements

with a step-on lawn edger when the lawn was wet, just below the grass, the idea being just to keep it clear of the lawnmower and use the dirt to attenuate common-mode RFI on its way to the antenna.

It also makes the coax easy to find (tune an AM radio to a weak station and turn the radio so the station is just audible; when you drag the radio across the coax, the signal level jumps up. Works every time.) and repair (know the distances any connectors beforehand) since you only have to scratch up a tiny bit of coax.

I don't know that conduit helps, in the sense that it will retain water as well as shield from it. The dirt just below the grass is usually dryish, which may be a better common state.

I've lost one of 8 cables to lightning in 8 years (so 64 cable-years) but otherwise they work nicely. The lightning one wasn't a direct hit but just a difference in ground voltage between the two ends of a long run.

But you already have the trench, so the lawn edger suggestion has little value, I guess.

Reply to
Ron Hardin

Reply to
Art Todesco

induction from close proximity power can induce quite a bit of voltage with a long run of cable.

300 feet of over head power lines, telephone cable about 3 feet below and unterminated on each end. Went to terminate one end after cable was hung, once a got hold of the wire and touched the metal can that was grounded knowcked me on my ass.

Reply to
MC

Amun posted for all of us... I don't top post - see either inline or at bottom.

Once again ABUM you prove you are an asshole!!

Reply to
Tekkie®

That's why they twist communication cable. Common mode noise is rejected anyway.

Reply to
gfretwell

Yes twisting the the wires can reduce noise, Not the same for inductive power

Reply to
MC

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