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UTP cabling and high voltage line near
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| casi |
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Posts: 7
Joined: 18 Mar 2008
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Posted: Wed Apr 23, 2008 7:58 am
Post subject: UTP cabling and high voltage line near
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I'm going to make an offer to surveillance an big power station with solar cells.
The project will be done with some Speed dome cameras.
My problem is about video cable running for the farthest: its distance from control room is around 300 meters.
It would be positioned in one corner of the field and video/data cables will run together with output high voltage line -380Vac- in 2 different sheaths but in the same excavation.
Unfortunately the company (who did everything but CCTV) is not a security specialist, they forecast only the CCTV system but they didn't care about these matters.
Since I would like to avoid noises on images, I'm much more oriented to use baluns for video instead of coax.
The buyer does not want to spend money for fiber optics.
Has anyone any experience about similar situations?
Is it true that UTP cabling is much more protected against electrical fields?
Any useful suggestions?
thx in advance!
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| survtech |
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Posts: 609
Joined: 21 Mar 2007
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Posted: Wed Apr 23, 2008 8:24 am
Post subject: Re: UTP cabling and high voltage line near
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| casi wrote: |
| Is it true that UTP cabling is much more protected against electrical fields? |
No.
| casi wrote: |
| Any useful suggestions? |
Fiber would be safest as is totally immune to electrical fields. For twisted-pair and coax you must maintain sufficient spacing between power and video cables. Install the video cable(s) in separate conduits from the power wires and space the conduits as far apart as possible.
OH! And cross your fingers!
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| casi |
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Posts: 7
Joined: 18 Mar 2008
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Posted: Wed Apr 23, 2008 9:11 am
Post subject:
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I know each installation is different from another, but honestly speaking I know very few about balanced UTP transmission.
Maybe your experience could be helpful.
For example 50cm distance within concrete could be enough?
If so I can try to use the existing conduits, otherwise I have to find other cable paths.
Anyway I agree, I will cross all hand and feet fingers!
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| survtech |
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Posts: 609
Joined: 21 Mar 2007
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Posted: Wed Apr 23, 2008 11:11 am
Post subject:
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| casi wrote: |
I know each installation is different from another, but honestly speaking I know very few about balanced UTP transmission.
Maybe your experience could be helpful.
For example 50cm distance within concrete could be enough?
If so I can try to use the existing conduits, otherwise I have to find other cable paths.
Anyway I agree, I will cross all hand and feet fingers! |
50cm might be enough, depending on what separates the two. If each is enclosed in separate metal conduit, there will be less likelihood of interference than if each is in plastic conduit.
The main thing is that the two (high and low voltage) can not share the same conduit. At least, that is what the NEC says (the U.S. National Electrical Code). Laws may vary elsewhere in the world.
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