Video and 100v P.A. in Cat5e

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Hi.
I need to connect a video camera signal from one building to another.
They are about 5m apart.

In the building where the camera will be located is a 100v pa system,
I also need to connect speakers in the second building to the P.A.
system.

I am wondering if I can use a CAT5e cable to carry the video signal
using baluns and also carry the 100v P.A. signal.
Is the P.A. signal likely to cause interference to the video signal?


If this may be a problem, I could use CAT5e for the video signal (or
maybe RG59 co-ax), and use another CAT5e (or maybe speaker cable) for
the P.A. signal.

It would be neat if both cables were run together in conduit, but
would they be too close together and still cause interference to the
video signal?

Thanks in advance for any help provided.

Russell.

Re: Video and 100v P.A. in Cat5e
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I expect you should discuss the matter with your cabler as he would
certainly be able to resolve the issues . the video and audio need to be
separated coincidently so following the rules pertaining would be
advisable , I assume you intend using a decent analogue cctv camera so
conventional duo coax and power combo would server perfectly .


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Re: Video and 100v P.A. in Cat5e
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Incidentley cat is rated to 50 volts only being elv

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Re: Video and 100v P.A. in Cat5e
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**Running 100 Volt audio over Cat5e is a recipe for disaster. Although
it MIGHT work, it also could cause damage to video equipment, if
problems occur. Much better to run a dedicated 100 Volt line. Ordinarly
speaker cable is usually adequate.

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Trevor Wilson www.rageaudio.com.au

Re: Video and 100v P.A. in Cat5e
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Have had no trouble running 70-100v  PA lines and RS485 data in the
same cable, longest
we have tried is about 100m, and in come cases this has been run right
next to video cable,
(not balanced line).  Never caused a problem.


While its definitely not the proper way to do it, I have run AV video
unbalanced video through cat 5 over a few metres
without problems, but go over about 10-15m and some interference
starts.  (usually horizontal white dotted interference lines in 1-3
places across the picture).


Best way is probably to just do a dummy run on the bench (or just do a
temporary run between the 2 locations  using a length of the cable in
question. I have a feeling it will work fine, but you don't want to go
to the hassle of running cables and conduits only to find that it
doesn't work as you want it to.



Whether you are supposed to do things like this or not is another
matter, and whether CAT5 is rated to handle 100v lines is another
matter again.    IIRC if you use a separate cable for the 100v line,
it is supposed to be double insulated.

Re: Video and 100v P.A. in Cat5e

Thanks for the quick replies.
To play it safe, I will use CAT5e with baluns for only the camera
video signal.

The 100v P.A. signal will be sent through a separate speaker cable.
If this cable should be double insulated, would 2 pair telephone cable
be suitable, the 2 pairs could be connected in parallel.

Before making the installation permanent, I will temporarily put both
cables beside each other to see if there is any interference visible.

Thanks,
Russell.

Re: Video and 100v P.A. in Cat5e
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As the telephone line (in Australia) goes to over 100v ac to ring the
bell the cable should be
adequate for a 100v line use.  (Note - it would not be suitable for
110v mains applications)


As for it being thick enough, it depends on how many speakers will be
run off it and what wattage.
I think up to 50w or so per pair would be fine but if you are running
a lot more than this, and are suffering
volume drop, you will need thicker conductors.

If you aren't using the telephone cable for anything else other than
the 100v line, I would simply parallel
the pairs, so if you are using 2 pair (4 core) - then use 2 of its
wires in parallel for one of the connections and the other 2 wires in
parallel for the other side of the 100v line.  This should be good for
close to an amp (100w load) over the 5 metre length you are quoting.

What I have seen used commercially for this job has a oval brown outer
sheath, red and black inner wires and from memory would be about 0.5mm
sq.



Note that if this is for an emergency announcement system - such as
fire for example, do not muck around, use exactly the same sort of
cable size as what is on the rest of the system.  It also may have to
be fire resistant cable also.







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Re: Video and 100v P.A. in Cat5e
Thanks for the extra info.
The system is not critical.
As well as the 5m between buildings, there will also be several meters
of cable required inside each building (yet to be worked out).
I may end up using thicker double insulated cable. Many details are
yet to be worked out, but the info. provided will be helpful.

Thanks,
Russell.

Re: Video and 100v P.A. in Cat5e
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Middies sell a suitable combo cable , power and coax with sheath which
is vermin resistant so woddles and philthy might leave  you alone ,
ideal for your use and good out to several hundred metres

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