Installation Help and Accessories

rg59 max distance

( >> )

able1 - 10 Apr 2008, 10:47 pm

Hey all,

I know this has been asked before but there seems to be multiple answers so I need to ask again.

What is the general rule for max cable run for RG59 coax???

My search is inconclusive.

Thanks much.

Les

survtech - 11 Apr 2008, 12:29 am

Most experts say 750 ft.

able1 - 11 Apr 2008, 07:08 am

[quote="survtech"]Most experts say 750 ft.[/quote]

Thanks, I have found that but have found reference to 200 -250 and 500. If it is 750 I am good to go since I am looking at 275'.

Now I have to look at the voltage drop issue.

Thanks again.

survtech - 11 Apr 2008, 09:49 am

275 ft. is no problem if you use proper RG-59. Make certain you get high-quality RG-59 with 100% pure copper center conductor and at least 95% braided copper shield. Do not use CATV cable, which uses clad center conductor (copper-coated steel) and aluminum shield.

able1 - 11 Apr 2008, 10:44 am

[quote="survtech"]275 ft. is no problem if you use proper RG-59. Make certain you get high-quality RG-59 with 100% pure copper center conductor and at least 95% braided copper shield. Do not use CATV cable, which uses clad center conductor (copper-coated steel) and aluminum shield.[/quote]

Thanks, most of my runs to date have been less than 150-175 foot runs. So now I am looking at almost twice that and don't want to shoot myself in the foot.

Thanks for the input.

si_kungs - 13 Apr 2008, 12:31 am

what do we need to avoid when running the cables? to avoid hum bars?

survtech - 13 Apr 2008, 11:57 am

QUOTE:
what do we need to avoid when running the cables? to avoid hum bars?

That's hard to say since you never really know if you are going to have a ground loop issue. The best I can tell you is keep the cable as far away from power wires as possible and if you have to cross them, do it at a 90 degree angle. Also try to attach the cameras to non-conductive surfaces where possible.

si_kungs - 13 Apr 2008, 08:06 pm

sir surtech in case the signal cables run parallel with the power lines, how far should the separation of this two wires to avoid any interference?

VST_Man - 14 Apr 2008, 07:24 am

1 foot minium

Smit9352 - 14 Apr 2008, 10:11 am

QUOTE:
1 foot minium

1ft Minimum or I've went as far as actually suspending the cable in the air away from the wire that most electricians have laying on top of the ceiling tiles.

How do others on the forum combat the "Ground Loop" issue on their end?

Thanks,
John

RickA - 14 Apr 2008, 10:18 am

I usually try to suspend my runs above the ceiling tile and away from most electrical conduit or runs, that way the electricians did not have me to blame for any of their problems, LOL. :D

survtech - 14 Apr 2008, 10:26 am

[quote:50d289e12e="Smit9352"]

QUOTE:
1 foot minium

Surprisingly with over 900 cameras, we have never had a ground loop issue in the casino. That is probably due to our using Pelco CM9760-MDA's on all inputs. Thay have isolated input connectors (no common ground).

C7 in CA - 15 Apr 2008, 01:03 am

[quote:972bcde056="Smit9352"]

QUOTE:
I usually try to suspend my runs above the ceiling tile and away from most electrical conduit or runs, that way the electricians did not have me to blame for any of their problems, LOL. :D

I blamed them once or twice until I got into a ceiling that they were doing the suspension of the wire and I was like :shock: :shock: :shock: so I had to take a different approach and routed my cable differently and worked great.

I'm embarrassed to say that around here it is usually the low voltage guys that are laying cable across the ceiling tiles.

I sure wish the vacuum guy would have called about this pipe. I would have liked to have moved that J-hook to the back side of that 2by. Now the cables are on the wrong side of the pipe. :roll:

But, Yes. We go high and never have interference issues. But the extra cable sure adds up!

C7 in CA - 16 Apr 2008, 01:49 am

QUOTE:
sir is the cable not be prone to attacks from rodents? do we need to put the cable inside flexible hose? or suspending the cable above the ceiling would do?

I think it depends on your location. Around here the only time I have had rodent problems is when the cable penetrates an exterior wall or floor. They seem to be chewing their way into the building more then anything else. I have never had rodent issues with suspended cable.

As far as having to run cable in conduit; That would be a question for your "local authority having jurisdiction". Around here we do not have to use conduit. But personally I am very particular about using proper fire wall penetrators and using plenum rated cable where needed.