I need to have some Cat5e and RG6 cables installed. It is in a location that will require them to be installed outside. I am having 2 new 220V circuits added (one for a well pump) and was told by my electrical contractor that the same ditch could be used for the low voltage stuff as long as they were in a separate conduit and separated with 6 - 12 inches of dirt.
The 220v circuits will be in their own PVC conduit 24 inches down. Will the 2 conduits and approx. 12 inches of dirt be sufficient to prevent interference in the low voltage wiring? Thanks!
Study Guides for VDV / Structured Cabling Installers
Frankly, I don't see an issue with induced noise from the 220 ckts. I might see a hum issue depending on what you're planning to have on both ends of the RG-6. If you are running baseband composite video, which I doubt, you might find yourself in need of an EQ DA. The EQ DAs have a differential input as opposed to a single ended or unbalanced input for the non-EQ DAs. Joe
Re: Low voltage wiring in High voltage trench#160439 04/05/0601:04 PM04/05/0601:04 PM
When I worked for cable the companies doind subdivisions and developments we put coax in the same trench with 12.5kv primaries. Trench was 36" wide, primary on one side, 120/240v services in the middle, our stuff on the other.
You are fine then because you are dealing with RF. Imagine hooking one end of the RG6 through a phono plug adapter to your VCR video output. Then imagine hooking the other end into the video 1 input of your neighbor's TV/monitor, three houses down. It would be quite likely that you would see a nasty bar traveling up through the picture. That's because there could be a sine wave on both center and outer conductor, when viewed from the receiving end. A differential amplifier will cancel most of that out because it is "common mode" hum. A single ended or unbalanced amplifier will faithfully reproduce the hum with the video. Joe
Re: Low voltage wiring in High voltage trench#160442 04/06/0608:45 PM04/06/0608:45 PM
>>Make sure that you are using cable designed for underwater use.<<
The cat5e cable I have is just standard cable. My RG6 may actually be RG6/U but I'll have to check. I've never seen any Cat 5e for underwater use. If I glue all of the joints on the PVC conduit, why should I expect it to be flooded some if not most of the time? I assumed the PVC would be water tight like it is for water lines.
Re: Low voltage wiring in High voltage trench#160444 04/07/0612:46 PM04/07/0612:46 PM