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g_nraja
Active Contributor

Join Date: Oct 2008
Posts: 23

Cable selection

10/12/2008 12:36 PM

three phase transformer of capacity 3600 KVA,output voltage of 433vac,Rated current secondary : 4833 Amps.In this regard we want to run a cable from transformer secondary to Incomer ACB located at distance from 300 metres from the transformer location.How many runs of cables to be laid ? What are the design factors involved in designing the cables? otherwise selecting Busduct is good option or not? pl expain in details.
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wareagle
Guru
United States - Member - New Member

Join Date: Jun 2008
Location: Alabama
Posts: 1604
Good Answers: 63
#1

Re: Cable selection

10/12/2008 4:23 PM

What are your responsibilities on this job? are you an engineer? degree? Where are you located? Do you have a code that governs the installation? Will you ever have the full 4833 amps running over 3 hrs at a time? I assume you want to use copper.
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g_nraja
Active Contributor

Join Date: Oct 2008
Posts: 23
#5
In reply to #1

Re: Cable selection

10/13/2008 7:40 AM

Dear sir, suppose if i am selected cables what are all the derating factors to be considered while designing cable selection and we don't have code that governs the installations
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PWSlack
Guru
United Kingdom - Member - Indeterminate Engineering Fields - Control Engineering - New Member

Join Date: Jan 2007
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.
Posts: 32175
Good Answers: 839
#6
In reply to #5

Re: Cable selection

10/13/2008 11:00 AM

Then either get hold of the local code, or the "we" should consult "those" that do cable calculations for the local code, and the "we" should pay for the calculation and the warranty that comes with the payment.

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kayems
Active Contributor

Join Date: Jun 2008
Posts: 24
#2

Re: Cable selection

10/12/2008 11:44 PM

wareagle is right. should follow the local code and in my opinion better to place the transformer near the load to reduce initial investments.
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Anonymous Poster
#3

Re: Cable selection

10/13/2008 12:44 AM

you can use Bus-Ducts , but you can keep your transformer near load centres.
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sarmen
Participant

Join Date: Mar 2008
Posts: 4
#4

Re: Cable selection

10/13/2008 6:49 AM

Please refer to Local Code, I recommend to select the Bus- Duct and Reduce distance of ACB to be around 10 meter. If you used Cable: Consider to voltage drop and tightness connection of cable to terminal of transformer and at the ACB.

Regards,

Sarmen
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Anonymous Poster
#7

Re: Cable selection

10/14/2008 11:23 AM

what u r going to pay us for giving idea......
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Users who posted comments:

Anonymous Poster (2); g_nraja (1); kayems (1); PWSlack (1); sarmen (1); wareagle (1)

Previous in Forum: how to calclate do fuse rating to be used   Next in Forum: Single phasing of squirrel cage induction motor

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