Do it all in one shot with something like
Cat5 is fine for a home installation. You probably aren't running too
many multimedia files that would require more than 100 Mbps. There are
variants of the above that do include Cat6 or 7, but the switches etc are
not priced for home use (by most people) yet.
Check out the specs on the cable for pull ratings. Some have an outer
jacket that allows for longer "pulls".
Cable TV -- no, you need coax (probably RG-6 IIRC) for "normal" cable
Phone -- yes, but running phone along with computer networking is not
considered proper by many installers
Computer -- yes, if you have an ethernet network
Intercom -- yes, probably, although there might be some bizarre sort of IC
that needs too many conductors (but I've never seen one)
If you do not know the answer, shouldn't you use a bigger conduit
and a pull string for later use if you are wrong? Cable TV runs on
RG6 coax and you didn't mention if you were putting that in the
conduit also. Phone can use cat 5 but not at the same time as the
internet, you probably could put the intercom and the phone on the
same cat 5 if you wanted to, but best case scenario would be to run
two cat5e cables and a coax, put a pull string in the at least 1 inch
conduit that you need to run and be worry free knowing that your bases
And pull three Cat5 cables (collectively about the size of RG-6 coax, maybe
a little smaller), one each for phone net and intercom. Alternately phone
and intercom might share one Cat5. For CATV pull good RG-6 quad shield. Keep
the bends to a minimum. If you are going to the effort anyway might as well
use 3/4" the cost difference in terms of total project cost will be minimal.
Most Cat5 cables contain 4 pairs of twisted wires. So one cable can carry
internet and phone. Actually in my house only two of the four phone wires
are connected, so one Cat5 cable could carry internet,phone& intercom assuming
intercom needs only two wires. Better to be safe though and add a second
While in practice Cat5 could technically carry cable TV as well it would require
non-standard components and would not be as good as RG-6.
This looks like to me... Three cables...
1) CAT5 for internet, wire up all 8 wires to the outlet on both sides which
room for two internet networks should you want to expand in the future.
2) CAT5 for phone & intercom. You could use CAT3 by why go cheap?
3) RG-6 for cable TV.
I this needs to be clarified; 10 and 100baseT use only two pair, the
ones on pins 1&2 and pins 3&5. There's a nice picture at
http://www.aptcommunications.com/ncode.htm . There is no shortage of
ethernet tech info on the Internet.
Having said this, it is "out of spec" to use the other pairs for
anything, which means if you do so, you'll never have your
installation approved as fully cat-5 (or 5e, or 6) compliant. Few
homeowners bother with this anyhow since it involves expensive people
with expensive equipment. In the early days before the wisdom of
pulling multiple cables was widely accepted, it was not unheard of for
IT staff to break the other pairs out to another jack and run two
ethernet links over one cable, with acceptable results - at least at
10 Mb/s. I can't say I've heard about phone-plus-ethernet. I think I'd
do the experiment *before* I committed to the cable pull.
Now, 1000baseT uses all 4 pairs:
1/2" is more than sufficient for cat5 cable. Cat5 is usually no more
than 1/4" in diameter. and since you plan to push the cable through,
then you don't need to worry about the maximum pulling force that you
can apply to the cable :)
Make sure you get the conduit deep enough. Pvc does not hold up well with
traffic, weight passing over it.
Make sure the wire is rated to be in wet locations. If not your going to be
doing this over in a few years.
1/2 inch will work fine. install it then use a vacuum to suck part of a
plastic bag through the conduit. I used 1/2 for my pool run recently. I was
installed the pull line by myself so I had to walk back and forth several
You can get phone and Computer over the CAT5 I am not sure about intercom.
I don't think you will get TV for that you need coax.
Make sure you bury deep you may want to invest in some marking foil tape to
put in the trench a foot above the PVC or some copper ground wire so the
location can be found!. I would be tempted to use black plastic irrigation
pipe myself you can get a longer length for fewer splices and it should
cost less and care less about how flat the trench is. 3/4 or 1" should
still cost less. Make sure you include a pull string in the pipe no matter
what you use for future stuff and try to avoid 90 degree angles use 2 45's
For 150' I would use a cordless phone myself as well a wireless computer
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