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ye genune question???

ah right i see and what other types of faults does a RCD detect?? and the Mcb?? and is the neutral to earth fault e,g when neutral is touching somewhere in the circuit is it or??

ah right, so basically i am just treating as a board connected directly connected to origin, and once you get the Zs for that board do you need to use this result for anything when testing the out going circuits from the garage board do you need to compare anything or at

so to measure Zdb would you disconnect the earth supplying this from the consumer unit in the house and test from there to the board in the garage ye??

how do you reckon its a neutral to earth fault???

Hello is it possible for you to have a look at my post you have been replying to as i really like what you have to say Thanks very much. Kevin McBeath

so when you calculate the Zs for the garage DB and then do compare the Zs value to that of what you get for the Zs of the distribution to make the circuit will disconnect in time or what???

you see when you says carry out a Ze test on the main board in the house that is the typical test that has 2 be done anyways aint it, your testing the resistance out with the consumer unit?? and when you says about testing the Zs at the consumer unit in the garage i thought that the Zs is...

(quote) What sort of NIC certificates are you trying to fill in Kev? I hope they're green ones if your not an NIC member. I'm guessing here but are you looking at the section on the top of the schedule of test results which asks for a Zs, PSC and RCD readings? If this is the case make note of...

ah right so they dont have to be compared then?? and to do the Zs at the incoming part do you just turn off the supply an disconnect the earth ye?

ah right i see what you mean , so why do they ask for 2 Zs readings then, one at the mains incomer and the out going circuits???? No i aint registered i used 2 work for a sparky company but they let me go, and i am just wondering about this as i cant remember it

Ye, would the measured value Zs out in the circuits would this be the same as the value recorded at the mains or not???

ye, so say for a house and this was the case would the the Zs value asked for on the NICEIC cert at the top right hand corner would that mean, really the Ze of the supply coming into the house, and would put this in the Zs box, but the value here wouldnt be the same out in the circuits when i...

so when they are asking for the Zs value at the supply on the NICEIC cert, does that really just mean the Ze value of the supply coming or what

Ye thats how i know it as being but what i dont understand is why does it say on the NICEIC Certificates on the top right corner Zs at the distrubution board and does the value have to be the same as the values recorded at the furthest away point on each circuit??? i only thought that Ze is...

hello you see when you do the Zs test, and on the top of the NICEIC, schedule of test results for the installation part at the top right hand corner it has asks for the Zs, and maximum prospective Fault current, i always thought that Zs is the whole system that has to be test, but yet the...

so the mcb will only detect L to E, L to N faults is that right?

ah right so if there was a neutral to earth fault would that trip the mcb or rcd?

i havent swapped the neutral over yet and the only work that has been done is a ring main wired into the board thats it, but i just wanting to know could it be that the neutral is connected into the wrong neutral bar?

ah right i think i understand what you mean the rcd is constantly monitoring the live and neutral the whole time and when there is leakage to earth will this trip the rcd is that right? isnt this the same as live to earth fault ye?? then would it not trip the mcb then?