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Topic Title: Parrallel Supplies
Topic Summary: Number of parallel conductors
Created On: 06 March 2013 01:39 PM
Status: Post and Reply
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 06 March 2013 01:39 PM
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carllangwood

Posts: 8
Joined: 08 February 2012

When sizing parrallel supply cables, is it a requirement to install three conductors to allow for failure of one, therefore the remaining two conductors are capable of maintaining the full load.
 06 March 2013 01:48 PM
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OMS

Posts: 18919
Joined: 23 March 2004

Originally posted by: carllangwood

When sizing parrallel supply cables, is it a requirement to install three conductors to allow for failure of one, therefore the remaining two conductors are capable of maintaining the full load.


Not usually, no - and it would be a very particular fault that open circuited a single conductor without influencing the other as they should be approx the same length and run generally in close proximity.

The choice of grouping ie 2 x, trefoill, 4 x or 5 x is generally a function of load versus conductor size/route and need for "equal" current sharing by conductors of a group.


Regards

OMS

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