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Topic Title: cat5 & swa in parallel
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Created On: 07 April 2011 12:15 PM
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 07 April 2011 12:15 PM
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SandyBoiler

Posts: 263
Joined: 02 October 2008

Hi folks,

I understand that it is a no-no to run power and data in parallel, I'm guessing the effect would be the data speeds would be reduced? Would you always code say, data cables run in parallel with a run of swa?

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Andy B
 07 April 2011 12:22 PM
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OMS

Posts: 22864
Joined: 23 March 2004

Could you support a Code with a regulation - 528.1 might do it depending on what the data circuit actually does, or possiby the Note 2 to 528.2

You might need to look in standards other than BS 7671 for an answer

Regards

OMS

-------------------------
Let the wind blow you, across a big floor.
 07 April 2011 12:47 PM
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Legh

Posts: 4427
Joined: 17 December 2004

As long as the SWA is bonded - earthed then this might suffice.

I look forward to an adjustment of my thinking

Legh

-------------------------

http://www.leghrichardson.co.uk

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 07 April 2011 12:58 PM
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OMS

Posts: 22864
Joined: 23 March 2004

Originally posted by: Legh

As long as the SWA is bonded - earthed then this might suffice.

I look forward to an adjustment of my thinking

Legh


Is the metal wire armouring an effective EMC screen, in my experience it actually isn't - it can be quite "gappy" at certain frequencies

Regards

OMS

-------------------------
Let the wind blow you, across a big floor.
 07 April 2011 01:18 PM
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Legh

Posts: 4427
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Originally posted by: OMS

Originally posted by: Legh

As long as the SWA is bonded - earthed then this might suffice.

I look forward to an adjustment of my thinking

Legh


Is the metal wire armouring an effective EMC screen, in my experience it actually isn't - it can be quite "gappy" at certain frequencies

Regards

OMS


Agreed, although I have seen this 'method' of installation used without any ill effects.

I think 528.2 appears to be quite stringent.

Legh

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http://www.leghrichardson.co.uk

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 07 April 2011 05:10 PM
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Jobbo

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Andy

What cable type is it? STP or UTP. If it's STP then it's generally not a problem.

Jobbo
 07 April 2011 05:23 PM
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TeesdaleSpark

Posts: 707
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According to table 1 of "RECOMMENDED CABLE SEPARATIONS TO BS EN 50174 PART 2" for screened data cables it is ok but for unscreened data cable and a screened power cable 30mm separation is required.
 08 April 2011 09:21 PM
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slittle

Posts: 3678
Joined: 22 November 2007

We've got cat5 running near some pretty big swa's around the farms and have never yet seen an issue (the cat 5's are running HD IP CCTV)

The only problem we have is the mice like the cat5 more than the swa.


Stu
 08 April 2011 09:30 PM
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ant1uk

Posts: 2376
Joined: 22 June 2010

I can't see any real issues running a cat 5 next to a SWA as the SWA has alot of insulation surrounding it plus its armour. I think you would be hard pushed to find any regulation against this and it would be debated on the above grounds.

I agree that singles and T+E, FP etc should be segregated which is obvious but SWA could be debated that the armour is in itself a containment with added layers of insulation.
 08 April 2011 09:33 PM
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slittle

Posts: 3678
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Ant,

FP is virtually screened I would have thought, possibly better than SWA by the earthed foil wrap


Stu
 08 April 2011 10:08 PM
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ant1uk

Posts: 2376
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My apologies stu I meant red FP200 for fire alarms is segregated
 09 April 2011 11:05 AM
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Legh

Posts: 4427
Joined: 17 December 2004

In the process of thought readjustment, a friend of a friend parked her car next to an electricity sub-station. Came back to find the electrical system was completely dead.
Had to take it to a garage to be reprogrammed.
This could be that the EMI generated by the carrier waves outside the 50Hz often used on transmission/distribution systems had affected the car's electronics?

Legh



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http://www.leghrichardson.co.uk

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 09 April 2011 04:03 PM
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slittle

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More likely telemetry transmissions from the sub in the uhf band upsetting the immobiliser and alarm receivers I would have thought

Stu
 09 April 2011 04:16 PM
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dickllewellyn

Posts: 1434
Joined: 19 March 2010

I cant see that the insulation of an SWA and the insulation of a CAT5 differ greatly from that of T+E and CAT5 run in compartmentalised trunking?

-------------------------
Regards
Richard (Dick)

"Insert words of wisdom and/or witty pun here"
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