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naha
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Join Date: Jul 2010
Posts: 9

Cable Selection

10/27/2014 8:19 AM

150 m 400 sq.mm 33kv cable is to be laid for three phase ungrounded system.What is preferable single core or three core armoured cable.
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lyn
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#1

Re: Cable Selection

10/27/2014 9:24 AM

Which do you think is better, and why?

Cite the local and national codes you use to make your decision.
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redfred
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#2

Re: Cable Selection

10/27/2014 9:49 AM

It is preferred that only people authorized and knowledgeable in the regional codes of power distribution work on voltages this high.

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7anoter4
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#3

Re: Cable Selection

10/27/2014 10:32 AM

If your interest is only informational-that means you don't intend to order the cables, not to design the raceway or to run the cables-then in order to receive an answer- except the reference to the local electric code-you need to state a lot of parameters. For instance how you intend to layout the cables: in cable tray, in underground free buried, in cable duct bank or other. Also the installation cost vs. cable cost is important-mainly if it is a long raceway. And more other...

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lyn
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#4
In reply to #3

Re: Cable Selection

10/27/2014 10:46 AM

Maybe it's an interview question.

OP said 150m.
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7anoter4
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#5
In reply to #4

Re: Cable Selection

10/28/2014 4:07 AM

Thank you, lyn.In my opinion,in a trench run the installation of 3 core cable will not differ from installation of three single-core cable. But to pull a 3*400 sqr.mm[3*800 MCM] cable in a cable duct bank it is a tough job [in my opinion, even for 150 m].

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IQ
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#6

Re: Cable Selection

10/28/2014 10:54 AM

Come on now gets, this is way old technology, Cables? 3 Core or 3 singes cores? Come now chaps. This is not cricket.

That voltage? Perfectly safe to Bluetooth over that distance. Why bother to excavate trenches and bother about cables. This is line-of-sight-distance, Bluetooth is just perfect.
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redfred
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#7
In reply to #6

Re: Cable Selection

10/28/2014 11:28 AM

You really think that one can Bluetooth 33,000 volt power distribution power? Since when has Bluetooth had a 150 meter range, too?

I'll assume that you were joking and forgot to post some emoticons.

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IQ
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#8
In reply to #7

Re: Cable Selection

10/28/2014 12:20 PM

My, my, we have advanced. It was done in 1900

Its old technology. It was just bigger then, now we have tiny devices to Bluetooth it anywhere. 33kV, 0r 33 000 volts, 6 of one and half a dozen of the other, no bother these days and a 150m is a walk in the park, line-of-sight, so to speak. Probably for this lad it is called Plug-n-Play but for me that is a busbar. ( Just for you sir)
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redfred
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#9
In reply to #8

Re: Cable Selection

10/28/2014 12:41 PM

Just to make sure we are on the same page.

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IQ
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#10
In reply to #9

Re: Cable Selection

10/28/2014 1:26 PM

Same page RedFred, I needed to have a smile. How is New York today? Busy as normal? Or are you off to the beech?
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7anoter4 (2); IQ (3); lyn (2); redfred (3)

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