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High PFC issues

Former Community Member
Former Community Member

Hi all,

First post coming in…

I have a installation that we have been asked to Test, I conducted the usual tests for the Ze & Pfc.  I got 0.4 ohms & 11.7kA respectively.  Its a commercial block and the transformer is behind a locked door about 20m away, so probably reasonable to assume it’s accurate.  So here is my question given the absence of 15kA RCBO’s and the rarity 15kA MCB’s, what are my options?

Thanks in advance.

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  • Former Community Member
    0 Former Community Member
    Hi Broadgage & Dave,


    Thanks for the swift replies.


    so, some context.  I tested at the main isolation switch (Merlin NS250 MCCB set to 250A) on the incomer of the Main DB.  This is supplied via a fused isolator attached the main header ( BS-88 ), which is approximately 7m away from the Main DB (singles in 100x100 trunking), interesting thing is there are 2 other headers in the same area serving alternative units, but that’s a completely different issue.


    I’ve tested the Ze & PFC several times throughout the day to look for load adjust variations that the grid like to do every so often, but the results are the same, and when I say the same I mean exactly the same.


    No plans to use RCBO throughout, it’s a restaurant and some areas need RCBO’s others simply need MCB’s either way I need to PFC at the end to go down.


    I’ll conduct a few tests on the circuits at the outlet points and see what my PFC looks like then.


    Thanks again for your help guys


    Tama


Reply
  • Former Community Member
    0 Former Community Member
    Hi Broadgage & Dave,


    Thanks for the swift replies.


    so, some context.  I tested at the main isolation switch (Merlin NS250 MCCB set to 250A) on the incomer of the Main DB.  This is supplied via a fused isolator attached the main header ( BS-88 ), which is approximately 7m away from the Main DB (singles in 100x100 trunking), interesting thing is there are 2 other headers in the same area serving alternative units, but that’s a completely different issue.


    I’ve tested the Ze & PFC several times throughout the day to look for load adjust variations that the grid like to do every so often, but the results are the same, and when I say the same I mean exactly the same.


    No plans to use RCBO throughout, it’s a restaurant and some areas need RCBO’s others simply need MCB’s either way I need to PFC at the end to go down.


    I’ll conduct a few tests on the circuits at the outlet points and see what my PFC looks like then.


    Thanks again for your help guys


    Tama


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