400a Supply, Cable arrangement |
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400a Supply, Cable arrangement |
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 Nov 9 2007, 03:17 PM
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#1
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Intermediate Member  Group: Full Member Posts: 24 Joined: 24-July 07 Member No.: 3,532  |
I am planning on installing a 400A supply from a 500KVA transformer substation. The design is for a 4 x 1c 240mm cable, about 120m length. What is the best way to install these cables? single duct for all cables - is this possible. Trefoil will require 3 cables but I have 4 cables. Open escavation, do I need to seperate the cables.
I have checked that if the cables are grouped, derated current will be 319A. My max demand is 250A/phase. I need some advise from your experiences. |
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Nov 12 2007, 07:18 AM
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#2
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Senior Member Group: Full Member Posts: 213 Joined: 21-October 06 Member No.: 2,159 |
Dear
This is the best to lay the cables separately as there heat and flux not de-rate the other cables but this will increase your expenditures. If your maximum demand is 250A only and there is no fair for increment of load in future, then you may lay the cables as grouped. -------------------- "Don't assume any thing, always check/ask and clear yourself".
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Nov 20 2007, 08:17 PM
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#3
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Intermediate Member Group: Full Member Posts: 24 Joined: 24-July 07 Member No.: 3,532 |
QUOTE (AB2005 @ Nov 12 2007, 07:18 AM)  Dear This is the best to lay the cables separately as there heat and flux not de-rate the other cables but this will increase your expenditures. If your maximum demand is 250A only and there is no fair for increment of load in future, then you may lay the cables as grouped. Thanks, I will install the cables in group in view of the fact that the demand is below and derating will still give me enough capacity. |
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