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mohantheone
Active Contributor
Engineering Fields - Electrical Engineering - Electrical Engineer

Join Date: Jan 2009
Posts: 10

Clearance Between OFC Cable and HT Power Cable

11/19/2012 6:57 AM

Can someone tell me how much should be the minimum clearance to be maintained between Optical fiber cable and High Tension Power Cable both in underground installation and in air installation. Is there any standrads available.

Thanks you..
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PWSlack
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United Kingdom - Member - Indeterminate Engineering Fields - Control Engineering - New Member

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Location: In the bothy, 7 chains down the line from Dodman's Lane level crossing, in the nation formerly known as Great Britain. Kettle's on.
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#1

Re: Clearance between OFC cable and HT power cable

11/19/2012 7:00 AM

As there is no interaction between them, the answer is that they can be in contact with each other.

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ronron
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Join Date: Jun 2008
Location: beverly hills
Posts: 116
#2
In reply to #1

Re: Clearance between OFC cable and HT power cable

11/19/2012 8:04 AM

Hi All

No issue

can lay in Trench or Tray. but it is safety to have redundant

Regard
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dhayanandhan
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Engineering Fields - Mechanical Engineering - New Member

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Location: CHENNAI, TAMIL NADU, INDIA.
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#6
In reply to #1

Re: Clearance between OFC cable and HT power cable

11/21/2012 10:07 PM

Dear Mr.PWSlack,

I have faced a problem similar to this, for a new Equipment installed and started - the distance between LT Power Cable and Optic Fibre was close to each other and the distance was about 10O MM, in the same cable tray.

There was a snag, the Optic Fibre related system/equipment developed problem and identified as INDUCTION EFFECT on account of the Current Flow in the Power Cable.

We increased the gap to 800 MM, to the possible extent, and the problem was under control, but not solved. We have been advised to lay a seperate cable tray for optic fibre cable with a distance of 1500 MM away, from Power Cable, it is planned to be implemented during shut down.

DHAYANANDHAN.S
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Joshi
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Join Date: Oct 2007
Location: India
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#3

Re: Clearance between OFC cable and HT power cable

11/19/2012 8:09 AM

Other side of the coin:

Fiber Optic Cable Installation & Safety Manual - Sterlite

101 Guidelines for Fiber Optic Cable Installation - Fiber Optics For ...

Fiber-optic communication - Wikipedia, the free encyclopedia
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7anoter4
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Join Date: Oct 2012
Location: 100 miles North from the World Center
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#4

Re: Clearance Between OFC Cable and HT Power Cable

11/20/2012 12:27 AM

NESC [ANSI/IEEE C2] Rule 354:D. Supply and communication cables or conductors

Exception:

Entirely dielectric fiber-optic communication cables may be buried together at the same depth

with no deliberate separation from supply cables or conductors provided all parties involved are in agreement

and Rules 354D1a, b, c, and d are met.

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7anoter4
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Location: 100 miles North from the World Center
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#5

Re: Clearance Between OFC Cable and HT Power Cable

11/20/2012 3:48 AM

The Rule 354 D1a,b,c,d states the following:

no grounded [neutral] power cable above 22 kV [phase to ground]

no ungrounded [neutral] system cable above 5.3 kV [phase-to-phase]

ungrounded system cable above 300 V shall be shielded and shall be provided with ground-fault indication system and all these cables shall be bonded together.

I think it is preferable to keep more than 1 feet distance and at the crossing point to put the optical cable in a hot-dipped galvanized steel conduit. Of course, the Utility [or the power cable owner] has to be announced.

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