Hi guys, new here and just starting out. Have got my Elecsa assessment coming up Wednesday and just wanted to run a few things by you all as it seems a great forum to help. I have changed a CU as my job and whilst I believe all to be ok I just wanted to query a couple of things. Namely the cooker continuity reading on a 32A type B MCB is 0.95 ohms which when added to R1+R2 for calculated Zs comes in just under the tabulated maximum in table B6 in OSG. is this figure acceptable or should I measure Zs and enter this reading on test results as this would be the actual resistance of the fault path? secondly I carried out a Line connected to Neutral and earth insulation resistance test at the consumer unit as couldn't be sure I could disconnect all neons and sensitive equipment. my meter came back with 17.85 mega ohms. now it is greater than the 2 mega ohms required but just really wanted to check that this figure is within normal readings. it is in a 2 bed flat with 2 lighting circuits (new) two ring final circuits, an immersion heater, cooker and electric shower. I will be totally honest that I have done very little actual testing to date but want to change this by getting Part P registered and doing about four years worth of domestic installs before going on to take my 2394 testing C & G. any help would really be appreciated and if anyone has any tips on making sure I don't balls up my assessment I would be grateful as really nervous! many thanks in advance guys.
i'd be inclined to test each circuit separately L/N - E. you'll probably find that it's just 1 circuit is a bit low. conversely, the average IR per circuit is 17.85 x 7 = 125 Meg.
believe the flat is newish although old colours throughout. cable is T & E red and black. also just to add I reread my message and I put cooker plus R1+R2 which is wrong I meant cooker R1+R2 is 0.95 and this is added to measured Ze which is 0.14
believe the flat is newish although old colours throughout. cable is T & E red and black. also just to add I reread my message and I put cooker plus R1+R2 which is wrong I meant cooker R1+R2 is 0.95 and this is added to measured Ze which is 0.14
your measured Zs may well be lower due to parallel paths. but your R1+R2 does seem a bit high for a short 6mm circuit.check all terminations. 1 or 2 may be a tad slack.
pretty sure the circuit is 4mm T&E and is approx. 6m from cooker to CU. will also do individual IR for each circuit and also the cooker switch has a socket so will measure Zs from there too. thanks guys
pretty sure the circuit is 4mm T&E and is approx. 6m from cooker to CU. will also do individual IR for each circuit and also the cooker switch has a socket so will measure Zs from there too. thanks guys
im going to check all connections and recheck them, then carry out the test again. perhaps I just need to do a bit more as I have very little testing experience so far. but will fully check everything possible and see what comes back, will also do a zs test on the socket. thanks
im going to check all connections and recheck them, then carry out the test again. perhaps I just need to do a bit more as I have very little testing experience so far. but will fully check everything possible and see what comes back, will also do a zs test on the socket. thanks
I'm a bit concerned by you asking whether or not you should carry out an EFLI test.
It is an essential part of the testing process, not carrying it out suggests a lack of knowledge on your part.
I will admit to not having a full range of knowledge yet, I was of the understanding that you could either measure Zs or calculate it using (R1+R2)+ Ze which I already measured. is this not correct? not being smart, really just want to pick up everything I can. thanks
It is not actually required to do a live Zs test as the calculation from Ze and R1+R2 is the worst case, however it is always a good idea because it is at least a final check that all is OK.
It is not actually required to do a live Zs test as the calculation from Ze and R1+R2 is the worst case, however it is always a good idea because it is at least a final check that all is OK.
I will admit to not having a full range of knowledge yet, I was of the understanding that you could either measure Zs or calculate it using (R1+R2)+ Ze which I already measured. is this not correct? not being smart, really just want to pick up everything I can. thanks
Gasp lol, well at least you have the DB in your house for the buffoons at elecsa to look at, quite frankly I am appalled at the lack of standards now in the trade, embarassed actually, providing you have 5 weeks under your belt, electricity in your house and 400 sobs in a brown envelope these days you are in pmsl.
[QUOTE ] I will admit to not having a full range of knowledge yet, I was of the understanding that you could either measure Zs or calculate it using (R1+R2)+ Ze which I already measured. is this not correct? not being smart, really just want to pick up everything I can. thanks [/QUOTE]
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