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25Ka at the intake 2ka is our calculated pfc at one of our bedsit consumer unit. There's 4 blocks  A,B,C,D block C is where the intake is the substation is on site 8 meters away from our main LV panel situated in block C. This is where we'd see the highest fault current obviously. block A is...

Our Mcb distribution board is feeding a domestic board full of rcbo's. It's student accommodation, our discrimination calculations all stack up. The bedsits maximum demand area arround 30amp. you wouldn't have three tiers of MCCB protection.  It breaks down as follows from the hob for example ...

Northern power, hard work at the best of times.

Done this already waiting on the response. 

the DNO has quoted 25ka, we get 2ka further upstream 

It's been a long day, The consultants worry is the high falut current quoted be the DNO, however this isn't an issue further upstream 

Yes I did I was ******** you mum, thanks for *.*.*.* all 

Are you taking the piss?  I know how the device works  I have run my own electrical company for 15 years. The fault current noted on the device is what the device can safely cut agreed I have no issues with that. My worry is that with a low falut current of less than 1ka in some instances...

Rated at 63Amp operating current  25ka pfc as mentioned. I want to know if this will open safely under falut?  The consultant is adherent that we use MCCBs to protect the flats as opposed to mcbs as we have designed it. We will have a maximum of 2ka pssc within the flats, would the mccb...

Hi Just need a answer to this, is there a minimum amount of fault current needed to open a 25ka 63amp MCCB? On test we have a 2ka pssc.

The incoming supply is a 270kva (400amp per phase) from the transformer, we intend to fit a panel with the option to upgrade the supply to 800amp. The documentation/quote from the DNO states 25MVA however the spec states 25Ka little confusing TBH  

Hello,  I am currently working on an installation and a issue has come up in regards to distribution. Below is a ruff break down of the installation the install consists of four apartment blocks:-  270Kva supply quoted 25MVA!! fault current  Main LV 800amp MCCB panel  leaving this panel...