How big a duct for future wiring?
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Posted by California dude on March 30, 2005, 1:30 pm
Please log in for more thread options I have a 2 story house where we are going to be putting in central air conditioning in a few weeks. I want to take advantage of this construction to put in some kind of pipe or duct that I can use to get video and Cat 5-type wiring up to the second floor The contractor needs to run a 10" round "return" duct from the crawl space under the house up to the attic above the second floor ceiling. I want to be able to tell the contractor that I need "X" size additional clearance for this pipe. So I have some questions. I want to install RG-6 for video applications and Cat 5 or 5+ for other applications. Is there any engineering or technical reason why this duct can't be very close to, even touching the outside of this return duct? The return will take hot air from intakes on the ceiling or walls of second story rooms and bring it down to the furnace/air conditioner, which is located in the crawl space. (The exisitng heating ducts will bring cool air into the various parts of the house.) How big a pipe? What kind of materials would be OK or not OK? I'm planning to have 3 "drops" in the upstairs room. Each "drop" will be a wallplate with two RG-6 and 2 Cat5 or Cat5e for networking and multiple phone line services. So that brings me up to 6 RG-6 plus 6 Cat 5 or 5e. But I also want to be able to get satellite TV in the future. I don't have that now, and I don't know much about satellite TV right now, except that people around here seem to think it's better than cable. But, for now, assuming that I need two dishes (which I've seen on some houses in my neighborhood), how many RG-6 cables would I need? Do I also need to provide 110V AC power to these dishes? So, to sum it up, I need 6 RG-6 plus 6 Cat 5 or 5e, plus whatever I need to for the satellite TV service. Did I leave out anything obvious? A big thank you to everyone who shares their experience with me. | ||||||||||||||||||||||||||||||||||||||||||||||
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Posted by Mark J on March 30, 2005, 5:49 pm
Please log in for more thread options In regards to getting satellite TV in the future, if you are just getting DirecTV or Dish Network, you just need to run the RG6 cable from each room, then locate the ends close to where the dish would likely be located. The dishes' LNBs (low-noise block downconverter) gets its power from the receiver via the coax. DirecTV installs usually depend on the type of dish you will have, and whether or not a multi-switch would be needed. Generally if they install a 'multi-sat' dish you have a built-in 4 output multi-switch at the dish, and it can serve up to 4 satellite receivers. I've used to work tech support for DirecTV so I know all the ins & outs of those systems. Right now am just concentrating on getting my AAS degree in network systems so I can get something better. Anyway, hope that answered your question on the sat-TV portion of your post. Mark | ||||||||||||||||||||||||||||||||||||||||||||||
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Posted by Bob Vaughan on April 1, 2005, 12:20 am
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>In regards to getting satellite TV in the future, if you are just getting
>DirecTV or Dish Network, you just need to run the RG6 cable from each room, >then locate the ends close to where the dish would likely be located. The >dishes' LNBs (low-noise block downconverter) gets its power from the >receiver via the coax. DirecTV installs usually depend on the type of dish >you will have, and whether or not a multi-switch would be needed. Generally >if they install a 'multi-sat' dish you have a built-in 4 output multi-switch >at the dish, and it can serve up to 4 satellite receivers. With our Dish installation, we have 2 dishes, with a total of 3 LNB's, connected to an external switch module. From there, a single cable feeds each receiver. Per the instruction manual, you can have up to 200' of RG6 between the LNB and the receiver, as long as you are using the newer DishPro components (as I would expect for a new installation). Older legacy systems have a 100' limitation. If you're using a dual satellite LNB without an additional dish, depending on the LNB, you can feed up to 4 receivers directly from the LNB, beyond that you would need a switch. Check with DirectTV for specs on their systems. http://www.dishnetwork.com/downloads/pdf/technology/installation/SHOW_949_dishpro_install.pdf I would run a conduit from the roof (or other likely dish mounting location) to your central distribution point, this would let you locate the switch there, and feed any room via your installed cabling. keep the 200' limitation in mind when planning your cable runs. For a dish mounting location, you need a clear line of sight to the south, as the satellites are all located over the equator. I would install at least a pull string to the roof, as well as a ground wire (check the NEC, and your local codes). The ground wire dosen't want to be in the same conduit as the coax, and wants to run to the electrical service entrance ground via a direct route. You will probably want to ground the coax where it enters the building. I would use only RG6 rated for 2150Mhz or higher for your installation, that way you can use any of your coax runs for satellite. Make sure to terminate them properly, using high quality connectors (I like the snap-n-seal type). >>I have a 2 story house where we are going to be putting in central air
>> conditioning in a few weeks. I want to take advantage of this >> construction to put in some kind of pipe or duct that I can use to get >> video and Cat 5-type wiring up to the second floor >> >> The contractor needs to run a 10" round "return" duct from the crawl >> space under the house up to the attic above the second floor ceiling. >> I want to be able to tell the contractor that I need "X" size >> additional clearance for this pipe. So I have some questions. >> >> I want to install RG-6 for video applications and Cat 5 or 5+ for >> other applications. >> >> Is there any engineering or technical reason why this duct can't be >> very close to, even touching the outside of this return duct? The >> return will take hot air from intakes on the ceiling or walls of >> second story rooms and bring it down to the furnace/air conditioner, >> which is located in the crawl space. (The exisitng heating ducts will >> bring cool air into the various parts of the house.) >> >> How big a pipe? What kind of materials would be OK or not OK? I'm >> planning to have 3 "drops" in the upstairs room. Each "drop" will be >> a wallplate with two RG-6 and 2 Cat5 or Cat5e for networking and >> multiple phone line services. So that brings me up to 6 RG-6 plus 6 >> Cat 5 or 5e. Dale summed it up fairly well.. it's always better to have more conduit space than you think you need, and it's easier to pull cable into an empty conduit, than a full one. When installing conduit for telecommunications use, make sure that any turns are done using sweep bends, or large pull boxes to allow for minimum bend radius. If you use pull boxes, make sure they are accessable, and that you can actually pull into them. Use proper cable lubricant when pulling cable, and always leave a pull string in any unoccupied, or underfilled conduit. Use proper firestops at both the top and bottom of each conduit run. >>
>> But I also want to be able to get satellite TV in the future. I don't >> have that now, and I don't know much about satellite TV right now, >> except that people around here seem to think it's better than cable. >> But, for now, assuming that I need two dishes (which I've seen on some >> houses in my neighborhood), how many RG-6 cables would I need? Do I >> also need to provide 110V AC power to these dishes? The LNB's are powered from the receivers via the coax, but you do want to pay attention to proper grounding of the dish system. >>
>> So, to sum it up, I need 6 RG-6 plus 6 Cat 5 or 5e, plus whatever I >> need to for the satellite TV service. Did I leave out anything >> obvious? I'd double the cat-5 to 4 drops per plate. -- -- Welcome My Son, Welcome To The Machine -- Bob Vaughan | techie@.stanford.edu | kc6sxc@w6yx.ampr.org | P.O. Box 19792, Stanford, Ca 94309 -- I am Me, I am only Me, And no one else is Me, What could be simpler? -- | ||||||||||||||||||||||||||||||||||||||||||||||
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Posted by Dale Farmer on March 30, 2005, 10:49 pm
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California dude wrote: > I have a 2 story house where we are going to be putting in central air
> conditioning in a few weeks. I want to take advantage of this > construction to put in some kind of pipe or duct that I can use to get > video and Cat 5-type wiring up to the second floor > > The contractor needs to run a 10" round "return" duct from the crawl > space under the house up to the attic above the second floor ceiling. > I want to be able to tell the contractor that I need "X" size > additional clearance for this pipe. So I have some questions. Since he probably will be framing up a square around the round duct, just find out what size round conduit will fit into the corners left vacant. ( Off the top I'd guess a three or four inch round would fit nicely, but a few minutes with a piece of paper and a ruler will give you the answer. ) Put in four of them. Do remember that you want to put in fire stop barriers for this as well. This gives you a conduit for power, a conduit for data, a conduit for video, and a spare for future use. --Dale | ||||||||||||||||||||||||||||||||||||||||||||||
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Posted by Kenneth on March 30, 2005, 9:49 pm
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On Wed, 30 Mar 2005 19:49:35 GMT, Dale Farmer >Put in four of them. Do remember that you
>want to put in fire stop barriers for this as well. > This gives you a conduit for power, a conduit for data, a conduit >for video, and a spare for future use. Howdy, 'Sounds like that would be enough for many dozens of cables... All the best, -- Kenneth If you email... Please remove the "SPAMLESS." | ||||||||||||||||||||||||||||||||||||||||||||||
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> conditioning in a few weeks. I want to take advantage of this
> construction to put in some kind of pipe or duct that I can use to get
> video and Cat 5-type wiring up to the second floor
>
> The contractor needs to run a 10" round "return" duct from the crawl
> space under the house up to the attic above the second floor ceiling.
> I want to be able to tell the contractor that I need "X" size
> additional clearance for this pipe. So I have some questions.
>
> I want to install RG-6 for video applications and Cat 5 or 5+ for
> other applications.
>
> Is there any engineering or technical reason why this duct can't be
> very close to, even touching the outside of this return duct? The
> return will take hot air from intakes on the ceiling or walls of
> second story rooms and bring it down to the furnace/air conditioner,
> which is located in the crawl space. (The exisitng heating ducts will
> bring cool air into the various parts of the house.)
>
> How big a pipe? What kind of materials would be OK or not OK? I'm
> planning to have 3 "drops" in the upstairs room. Each "drop" will be
> a wallplate with two RG-6 and 2 Cat5 or Cat5e for networking and
> multiple phone line services. So that brings me up to 6 RG-6 plus 6
> Cat 5 or 5e.
>
> But I also want to be able to get satellite TV in the future. I don't
> have that now, and I don't know much about satellite TV right now,
> except that people around here seem to think it's better than cable.
> But, for now, assuming that I need two dishes (which I've seen on some
> houses in my neighborhood), how many RG-6 cables would I need? Do I
> also need to provide 110V AC power to these dishes?
>
> So, to sum it up, I need 6 RG-6 plus 6 Cat 5 or 5e, plus whatever I
> need to for the satellite TV service. Did I leave out anything
> obvious?
>
> A big thank you to everyone who shares their experience with me.