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Anonymous Poster

MV cables

01/06/2008 9:07 AM

is there ant problem if Mv cables are exposed to direct sunlight?
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nesubra
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#1

Re: MV cables

01/06/2008 9:36 AM

It depends on where u are and the load current and cable rating.Normally it should not where ambient is high as 50Deg C as in some parts of India cable can overheat .

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JohnDG
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#2

Re: MV cables

01/06/2008 10:56 AM

MV ≡ Medium Voltage - correct?

If the cables are insulated, you should check that the insulating material isn't going to be adversely affected by the UV in the sunlight. (Also check to see if you need to derate for added heat input from the sunlight (as per post #1)).

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biswanath.das
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#4
In reply to #2

Re: MV cables

01/06/2008 11:36 PM

Insulating material,outer pvc jacket, etc of Cable are designed for high temperature etc. Water absorption test, temperature test, HV, IR etc tests are also carriedout. I understand that no standard and regulation bind cable w.r.t UV ray, expect its derating. We quote design ambient as 50 deg C in specification of cable.You can certainly use at 50 deg C provided you derate the cable and increase the no of run accordingly. Some projects uses cable tray cover to get advantage on derating.

I will suggest you to go through IEC 60287-1-1 etc all parts to know more on this subject.

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Anonymous Poster
#10
In reply to #2

Re: MV cables

01/08/2008 6:01 AM

thanks alot dear.it is an efffective one.
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deivid_augusto
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#3

Re: MV cables

01/06/2008 4:27 PM

well!! first of all... is the first time i'm replying a post... even though I'm still starting to get some knowloges in my area and even in this language... any way.. here in Brazil.. when some places are very exposed by the insolation some materials starts to crack.. so... that what cables are supposed to suffer, even if in a small scale.

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Anonymous Poster
#5

Re: MV cables

01/07/2008 4:09 AM

Ants are not known for being dependent on MV cables for a food source.
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EnviroMan
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#6
In reply to #5

Re: MV cables

01/07/2008 1:36 PM

At least it took until comment #5 for this to surface...

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Pebbles
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#7
In reply to #6

Re: MV cables

01/07/2008 2:49 PM

We're not supposed to "Bather" the guests are we???

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EnviroMan
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#8
In reply to #7

Re: MV cables

01/07/2008 5:00 PM

If 'twere up to me, I'd not bather to answer...

(look it up...)

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biswanath.das
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#9
In reply to #8

Re: MV cables

01/07/2008 10:40 PM

hahahaha... sometimes humor is required even in serious discussion.

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EnviroMan
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#11
In reply to #9

Re: MV cables

01/08/2008 7:14 AM

Concur - in fact, I believe humor is always required, especially in the most serious of discussions. It's far too easy to take oneself too seriously, so do the difficult thing, and laugh!

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deivid_augusto
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#12
In reply to #5

Re: MV cables

01/08/2008 9:48 PM

what u mean by that...¿
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EnviroMan
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#13
In reply to #12

Re: MV cables

01/09/2008 9:04 AM

You'll just have to get used to what passes for humor around here - I have. The original post included a typo..."is there ant problem"...which pretty obviously should have said "any" instead. Since ants don't usually bother (OR bather...) cable insulation, they won't be a problem. We hope...

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deivid_augusto
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#14
In reply to #13

Re: MV cables

01/11/2008 10:02 PM

that's what all of us here say or laugh.... whatever... becouse sometimes we see people that are supposed do have a good knowledge, that are from developed countries and all of those advantages... but has no knowlodge enough to understand that Brasil is not as they think, like a big forest without people... of course that sometimes on the street or another common place we have to kill some selvage animal... as I did today... I had to kill an onça that was sleeping under my office's table... but...memean

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EnviroMan
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#18
In reply to #14

Re: MV cables

01/14/2008 10:29 AM

As I understand it, even the part of Brazil that IS a "big forest" is not devoid of people anymore. And yet, the savage animals most common are likely two-footed and wear clothing... Hope you don't have to kill any of THEM!

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deivid_augusto
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#15
In reply to #12

Re: MV cables

01/11/2008 10:18 PM

but... don't worry guy... continuo discurssing things whithout me... it happened cause I thought anyone could be invited to enter in any discussion here... sorry.
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JohnDG
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#16
In reply to #15

Re: MV cables

01/12/2008 4:19 AM

Hey, Deivid, lighten up! No-one is having a go at you (or the original poster). Guest (post #5) was just making a light joke at the expense of the OP having made a typo. Enviro was just explaining a point. You're very welcome to come along and make any comment you like (within reason!).

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deivid_augusto
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#17
In reply to #16

Re: MV cables

01/13/2008 12:41 PM

ohhh man, my bad... is becouse I'm still used to understanding english better when it's spoken and not when it's written... but then this fault.. :^) i'll take more care about meannings... thanks.
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EnviroMan
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#19
In reply to #15

Re: MV cables

01/14/2008 10:34 AM

All reasonable discussion (humor included) is welcomed! Please don't hesitate to participate.

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Anonymous Poster (2); biswanath.das (2); deivid_augusto (5); EnviroMan (6); JohnDG (2); nesubra (1); Pebbles (1)

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