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mohsinhamid
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For 415 Voltage Why Cable Rated in 1.1KV...???

10/07/2013 10:58 AM

Dear frnds,

For 415 voltage cable, the cable used is 1.1KV... I have seen in site we are using 1.1KV cable for 415 Voltage...

Please someone explain clearly...
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PWSlack
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#1

Re: for 415 voltage why cable rated in 1.1KV...???

10/07/2013 11:09 AM

Well, instead of asking a bunch of anonymous strangers, why not ask the installation's Electrical Engineer directly, whose name or initials are on the drawing? It cannot be seen from here.

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lyn
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#2
In reply to #1

Re: for 415 voltage why cable rated in 1.1KV...???

10/07/2013 11:33 AM

Perhaps he should ask the site engineer................................................................

No wait, he IS the site engineer.

From: On-line Electrical Design Course

"Iam B.Tech Electrical Engineer working as Site Engineer."

Must not have finished that on-line course yet.

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Fredski
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#3

Re: For 415 Voltage Why Cable Rated in 1.1KV...???

10/07/2013 12:10 PM

will a 20 ton rated truck carry a one ton load?easily!
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lyn
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#4
In reply to #3

Re: For 415 Voltage Why Cable Rated in 1.1KV...???

10/07/2013 12:14 PM

Wrong section. That'll have to go in the Mechanical Engineering, or Transportation sections.

This guy is a site "engineer".

OK, time for a break, I'm getting silly.
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7anoter4
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#5

Re: For 415 Voltage Why Cable Rated in 1.1KV...???

10/07/2013 12:22 PM

It depends on what standard has to be comply. In USA most of low voltage cable are constructed following UL standards-

UL 83 for PVC insulated cable and UL 44 for XLPE[CPE] or EPR. The rated voltage could be 600 V or 2000 V.

In IEC World, IEC 60502-1 stated the rated voltage 0.6/1 kV [maximum service up to 1.2 kV]for all low-voltage power cables.

But there are many other standards-most of them of military standards or special other- which could require other ratings.

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JRaef
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#6

Re: For 415 Voltage Why Cable Rated in 1.1KV...???

10/07/2013 12:24 PM

Typical reasons for something like this:

1) They are using some sort of specialized cable that only comes with that rating, for example shielded cable rated for use on inverter drives, because standing waves created by inverters can cause cable insulation damage in extreme cases and the do not want to take any chances.

2) This was originally installed for some higher voltage level, i.e. >690V, but when they changed the transformer to 400V, they did not want to needlessly replace the cable already installed.

3) They conversely want to be ready to increase the transformer secondary voltage to get more power later if necessary without having to pull new cables

4) There is some higher voltage system on site that requires this cable rating, and they don't want to have to maintain inventory of emergency replacement cables at two voltage levels, so they make everything the same.

5) The cable pulling had to be done in a hurry and this was all that was available.

6) Someone subscribes to the "bigger/higher rating is better, damn the cost" philosophy.

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redfred
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#7
In reply to #6

Re: For 415 Voltage Why Cable Rated in 1.1KV...???

10/07/2013 12:43 PM

You forgot one

6) To torment the next electrical engineer.

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IdeaSmith
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#8
In reply to #7

Re: For 415 Voltage Why Cable Rated in 1.1KV...???

10/07/2013 1:01 PM

He had 6 so yours is seven! Give him a GA!

I did!

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redfred
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#9
In reply to #8

Re: For 415 Voltage Why Cable Rated in 1.1KV...???

10/07/2013 1:10 PM

Did that torment you?

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IdeaSmith
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#11
In reply to #9

Re: For 415 Voltage Why Cable Rated in 1.1KV...???

10/07/2013 3:39 PM

Yes very much! What do you actually mean? That you did not give him a GA or the numbering?

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redfred
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#17
In reply to #11

Re: For 415 Voltage Why Cable Rated in 1.1KV...???

10/07/2013 9:50 PM

I have a live one here.

To torment or not to torment, that is the question?

What if I didn't mean anything? Can you live with that?

What did you mean by not marking your reply OT to my OT comment?

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IdeaSmith
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#19
In reply to #17

Re: For 415 Voltage Why Cable Rated in 1.1KV...???

10/10/2013 2:26 AM

Well maybe I was on topic with your off topic while yours was OT because you made it such. What do I know!

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Phys
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#10
In reply to #6

Re: For 415 Voltage Why Cable Rated in 1.1KV...???

10/07/2013 3:35 PM

You also missed:

The project engineering group copied a spec from another job which required the higher rated cabling. No-one saw this until the cable was purchased. (happens ALL the time - you should see the specs I am reviewing now that were obviously put together from several other projects)

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IdeaSmith
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#12
In reply to #10

Re: For 415 Voltage Why Cable Rated in 1.1KV...???

10/07/2013 3:40 PM

That makes it 8!

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lyn
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#13
In reply to #10

Re: For 415 Voltage Why Cable Rated in 1.1KV...???

10/07/2013 4:28 PM

Although I suspect this may be right, the OP did not give ANY usable information.
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Phys
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#14
In reply to #13

Re: For 415 Voltage Why Cable Rated in 1.1KV...???

10/07/2013 4:51 PM

Well - with no information at least there is no conflicting specs. That is what I am doing right now - looking at all electrical and instrument specs on a job (14 specs sections) and listing the conflicting sections to get clarifications. I even found one where the same spec section conflicts on 2 lines just 3 pages apart.

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lyn
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#15
In reply to #14

Re: For 415 Voltage Why Cable Rated in 1.1KV...???

10/07/2013 4:54 PM

My condolences.

Reconciliation of conflicting specs is a pain.

I know.
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Phys
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#16
In reply to #15

Re: For 415 Voltage Why Cable Rated in 1.1KV...???

10/07/2013 5:03 PM

We get 2 types of specs:

1. As in this post - no information. Fill in all the blanks yourself.

2. Way over engineered and full of conflicting sections.

Of the two I like the 2nd. better because you at least have a place to start, and it almost makes some sense.

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#18

Re: For 415 Voltage Why Cable Rated in 1.1KV...???

10/09/2013 3:27 AM

9. Cable of a lower voltage rating is either unavailable or inapplicable.

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IdeaSmith
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#20
In reply to #18

Re: For 415 Voltage Why Cable Rated in 1.1KV...???

10/10/2013 2:27 AM

Still counting!

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7anoter4 (1); Fredski (1); IdeaSmith (5); JRaef (1); lyn (4); Phys (3); PWSlack (2); redfred (3)

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