Pfc To High

[skystorm]

Hi all 

        Just got the EICR back to day and going thought it , and sorting out all the codes 2 and 3 out 

        which one of them is , The PFC exceeds the board of the mcbs which is  3 phase 100A 

        with this it has a BS 88 63 amps fuse on the other side , 

        its the way he has worded it

 any ideas would be great full

 

[Sidewinder]

A little more detail?

 

[skystorm]

sorry thats what he has put on the report , Trying to phone him to find out more but he is on leave 

 

[ProDave]

What PFC has he quoted?

 

[skystorm]

was on leave, got a firm in to test the main feeds from the,main plant room,which is on busbar to fuse box BS88 fuse 63A= 35m swa  feed the buildings

its a army camp and thats what he put on the report - The PFC exceeds the board of the mcbs 

regards 

 

[Sidewinder]

OK, wording seems nonsense TBH.

 

[skystorm]

thanks the snake ,

                          same fellings ,

 

[steptoe]

as Dave asked,

what is the PFC he has quoted?

 

[ProDave]

Yes, there should be an actual reading, a certain number of KA.

If he hasn't taken a measurement and recorded that info, then his poorly worded statement is meaningless.

 

[Technician]

Which begs the question....did he know how to do it.

 

[Steve3948]

Upstream protection ?

 

[Bruspark]

I'm guessing he means the prospective fault current exceeds the breaking current of the mcbs ... And the mcbs may be trying to interrupt some mS before the 63A fuse does...

But without seeing and testing it who knows ....

 

[binky]

MCBs protect what is downstream of them, as long as fault current downstream is lower than Ka rating there isn't an issue - there was a long protracted discussion about this some time ago, anyone good at searching this site care to go find?