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ahmed952
Active Contributor

Join Date: May 2008
Posts: 13

cable size

05/19/2008 7:06 AM

Hi,

Can anyone please let me know how to select a cable based on its total connected load, i have selected a 4 core 185mm for 300amps incomer please let me know am i right or wrong

thanks.
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Sparkstation
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New Zealand - Member - Interested in everything- see my Profile please APIX Pilot Plant Design Project - Member - Member Engineering Fields - Electrical Engineering - Member Engineering Fields - Power Engineering - Member Engineering Fields - Civil Engineering - Member Hobbies - Musician - Autoharp and Harmonica Hobbies - Hunting - Member Hobbies - Fishing - Member

Join Date: Nov 2007
Location: Christchurch, (The Garden City), South Island, New Zealand
Posts: 4395
Good Answers: 230
#1

Re: cable size

05/19/2008 7:42 AM

Hello ahmed952

You have failed to advise some vital information:

  1. Voltage
  2. DC
  3. If AC, Number of phases
  4. If AC, The frequency
  5. Other - Advise please

Type of cable:

  1. Lead covered
  2. Rubber
  3. Silicone Rubber
  4. XLPE
  5. Steel Wire Armoured
  6. Steel Tape Armoured
  7. Oil Filled
  8. Paper insulated
  9. Other - Advise please

Type of installation:

  1. Desert sand
  2. Undersea
  3. Heavy clay
  4. Gravel
  5. Loam
  6. In a conduit or pipe (Advise the pipe material)
  7. On a Cable Tray
  8. Vertical or horizontal orientation
  9. Ship
  10. Other - advise please

Climate:

  1. Hot Sahara or Middle East
  2. Antarctica
  3. Monsoonal
  4. Other - Advise please

Barometric pressure range - Minimum to maximum

There are other specifics needed, but those should do as a starting point, which is why you need to check the Maker of your particular cable, check their cable charts, or ask their Engineers for specific advice - After all, they should know their own cables better than anyone else, and there are significant variations between the "same cable" as made by different manufacturers.

Reply here, with


Kind Regards....

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ahmed952
Active Contributor

Join Date: May 2008
Posts: 13
#3
In reply to #1

Re: cable size

05/19/2008 8:34 AM

Thanks for ur response.

The details are as follows its for 3 phase AC current, 230v, xlpe/swa/pvc cable , supported on a cable tray for a cooling plant in middle east, frequency is 50hz , atmospheric weather varies from minimum 20 deg/c to maximum 50 deg/c.This cable is required as an incomer from the main distribution board for low voltage(L.V) for a building. If you require more information you can mail me.

Thanks a lot .
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V.I.Abraham
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Location: Pune , India
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#4
In reply to #3

Re: cable size

05/19/2008 4:07 PM

Hi ahmed952,

This subject matter was discussed in this very same site many times. Now Sparkstation has given the detailed data requirement for selection of cable with de rating factors . Still you cannot understand what he said.
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nesubra
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Join Date: Nov 2006
Posts: 729
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#5
In reply to #4

Re: cable size

05/21/2008 9:13 AM

Dear Mr. Abraham.

Thanks for sharing. its a very vital info link.

regds

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Sparkstation
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New Zealand - Member - Interested in everything- see my Profile please APIX Pilot Plant Design Project - Member - Member Engineering Fields - Electrical Engineering - Member Engineering Fields - Power Engineering - Member Engineering Fields - Civil Engineering - Member Hobbies - Musician - Autoharp and Harmonica Hobbies - Hunting - Member Hobbies - Fishing - Member

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Location: Christchurch, (The Garden City), South Island, New Zealand
Posts: 4395
Good Answers: 230
#6
In reply to #4

Re: cable size

05/21/2008 9:01 PM

Hello V.I.Abraham

I've given you a GA point, for that answer plus the excellent weblink.

Kind Regards....

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PWSlack
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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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#2

Re: cable size

05/19/2008 7:48 AM

Is this for copper or for wet string?

The Institution of Electrical Engineers maintains and publishes a wonderful thing called the Wiring Regulations that covers this very thing.

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Users who posted comments:

ahmed952 (1); nesubra (1); PWSlack (1); Sparkstation (2); V.I.Abraham (1)

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