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L

leestaf

Hi Guys
Any advice would be much appreciated!

I have tested a property that has a PFC greater than the short circuit capacity of the mcb's protecting the final circuits, the PFC is 7.9KA and the 60898 mcb's 6KA. The property is protected at origin with a 1361 type b fuse 16.5KA. Under the regs as i understand them the protective device must have a short circuit capacity greater or at least equal to the PFC, therefore am i wrong in assuming that i advise the client that the mcb's protecting the final circuits are upgraded to 10KA or not?:confused:
Would the 1361 fuse with a higher breaking capacity and similar fusing factor to the mcb protect the installation or not, also would this mean a lot of domestic properties that are situated close to substations but with "run of the mill" 6KA mcb's require upgrading??
 
The 1361 fuse at the origin will offer sufficient protection for fault current. There is no need to change the MCB's.


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