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Anonymous Poster #1

Running the Tray Parallel

05/08/2013 11:44 AM

Dear All

We have Elect and Instrument tray running parallel with a distance of 200mm

Any interference please advise.

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#1

Re: running the tray parallel

05/08/2013 11:51 AM

Yes, there will be interference. No matter the distance. The question is will it be harmful.

That's all we can say, since you furnish no details. Are there no code books to be found, wherever you are?

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#2

Re: Running the Tray Parallel

05/08/2013 11:56 AM

Unless your instrumentation does not need electric power to work, you must always have an electrical and instrumentation tray running in parallel somewhere. Now depending on the signals and the cables used in your instrumentation tray, you may have excessive or trivial amounts of interference. From the sparse information you provided, I cannot help you. Hire a qualified consultant to review your documents.

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Anonymous Poster #2
#3

Re: Running the Tray Parallel

05/08/2013 12:57 PM

Documents? What are documents?

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#4
In reply to #3

Re: Running the Tray Parallel

05/08/2013 1:38 PM
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#5
In reply to #4

Re: Ban Anonymuos Posters

05/08/2013 1:44 PM

There's no hope.

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#6

Re: Running the Tray Parallel

05/08/2013 10:51 PM

Have a look here

http://www.cabletrays.com/

Best I can do with no information to go on.

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#7

Re: Running the Tray Parallel

05/08/2013 10:55 PM

For only 200mm, not likely to be a problem.

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#8

Re: Running the Tray Parallel

05/08/2013 11:07 PM

The data cable should use twisted pair wiring so any interference to the data cable will be balanced on each wire and should minimize itself in the receiving circuit. Such noise pickup is called common-mode and most receiving circuits offer high common-mode noise rejection.
10.02.00 Cables shall be segregated as per IEEE Std.-422 and IEEE 524 (1992) In vertically stacked
trays, the higher voltage cable shall be in higher position and instrumentation cable shall be in bottom tier of the tray stack. The distance between instrumentation cables and those of other system shall be as follows:

From 11 kV/6.6 kV/3.3 kV tray system - 914 mm
From 415V tray system - 610 mm
From control cable tray system - 305 mm

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#9
In reply to #8

Re: Running the Tray Parallel

05/08/2013 11:54 PM

IEEE-422 is obsolete ,I am afraid ,and "IEEE 524" I think it is not IEEE Standard no.

IEEE 524-2003 guide to the installation of overhead transmission line conductors

May be your intention was IEEE Std 525 :

IEEE Guide for the Design and Installation of Cable Systems in Substations.

If EMI is a problem indeed, I think-besides the one feet distance from low-voltage power-it is indicated to employ covered metallic solid bottom for instrument cables. Shielded-screened-instrument cables it is recommended, also.

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#11
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Re: Running the Tray Parallel

05/09/2013 1:28 AM
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#13
In reply to #11

Re: Running the Tray Parallel

05/09/2013 7:15 AM

You are right .IEEE Std 422-after 16 years withdrawn[1994]- is renewed-I did not know.

But IEEE Std 524 is still dedicated for transmission overhead line.

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#10

Re: Running the Tray Parallel

05/09/2013 12:03 AM

300mm perhaps? Pl. refer to IS 1255.

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#12

Re: Running the Tray Parallel

05/09/2013 3:15 AM

What is in the instrumentation tray?

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Anonymous Poster #3
#14
In reply to #12

Re: Running the Tray Parallel

05/09/2013 7:46 AM

Dear Experts,

I have read from some consultant that same frequency cable like 50 Hz control cable

( 440 Volt ) and 50 Hz ( 11 KV or 22 KV cables ) may be laid on same cable tray, only as discussed above there should be distance as mentioned by Mr. PWSlack.

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#15
In reply to #14

Re: Running the Tray Parallel

05/09/2013 9:22 AM

NEC art.300.3:

"Conductors having nonshielded insulation and operating at different voltage levels shall not occupy the same enclosure, cable, or raceway."

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