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keith@kbw

can any help me, i need to install 200amp three phase supply at 135m long, i wish to run two smaller cable insted of one large size cable, so can any one tell how to calculate for parallel cables supply.:confused:
 
we are supplying a water teatment plant, which needs 120amps 3 phase+N and we have to run parallel cable plus earth cable, what i am looking for is formulas to calaculate cables sizes.
 
for your 200amp supply

185mm 4 core will be fine....(thats in the ground)
150mm 4core on tray (perforated)

hope that helps
 
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thank you all your help, but can one help me with the formulas and calulations ?
 
Max demand and diversity along with possibly power factor correction to be considered, The link below could prove usefull to you hope it helps. :)

cablecalculation

Also appendix 4 of the big red book will give you all you need with regards to calcs rating factors ect.
 
Last edited by a moderator:
I would think a 185mm is a bit over and without checking would have thought a 4c 120mm
would be ok or 2x 4c 70mm in parallel also i believe cables in a trench underground benifit from the natural cooling of the soil
yours benji
 
Do you have all the details of equipment you are connecting? Supply over 100A really should take into account Xl and Xc so a bit of j notation might be required. As for the two cables thing if your calcs ask for a 400mm2 cable for example and you want to use two for ease of installation just use 2 x 200mm2.
 
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400mm? have you ever pulled a 400mm 4c ,i,ve pulled 300mm 4c & singles upto 1000mm
but your talking high current way above the 120a that started this thread .My college days
are long gone but i still reckon 2x 70mm 4c will do it.
But back to the original thread it doesn,t give you a clue as to how the cables could be installed so you don,t know what the correct factor to apply so more info needed

yours benji


sorry 120a should read 200a but still reckon 2x704c

benji
 
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400mm? have you ever pulled a 400mm 4c ,i,ve pulled 300mm 4c & singles upto 1000mm
but your talking high current way above the 120a that started this thread .My college days
are long gone but i still reckon 2x 70mm 4c will do it.
But back to the original thread it doesn,t give you a clue as to how the cables could be installed so you don,t know what the correct factor to apply so more info needed

yours benji


sorry 120a should read 200a but still reckon 2x704c

benji

No no, i was just using the size as an example and showing to divide the CSA by two for the correct cable size.
 

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