2391 exam tonight

[Steve D]

Well, how did you get on ?

What was the scenario ?

Cheers
Steve

 

[Sparky75]

Yeh, I took it that an EIC issued for the new ring final, new DB and wiring and then a periodic carried out on the existing to ensure everything ok after addition and alteration - thats what it tells you in GN3,
anyway


Wayne

Yep did exactly the same a nice easy 6 pointer

 

[beats]

yeah not a bad test all in all was quite happy when i finished just have to wait and see for the result, is it right that that won't be until february?
The Zs question on the lighting did catch me out and i did put 1.5mm but hopefully should still get some marks for my working out, Out of the 5 possible marks.

 

[Sparky75]

yeah not a bad test all in all was quite happy when i finished just have to wait and see for the result, is it right that that won't be until february?
The Zs question on the lighting did catch me out and i did put 1.5mm but hopefully should still get some marks for my working out, Out of the 5 possible marks.

I've just realised I forgot to mention nulling the leads on the Ring final connections question b******* thats it I''m applying for the resit in January LOL! and going to stop reading this threrad.

 

[WayneL]

I've just realised I forgot to mention nulling the leads on the Ring final connections question b******* thats it I''m applying for the resit in January LOL! and going to stop reading this threrad.

Me too, Sparky75!!!

I don't know whether it was required though - they didn't ask for the procedure
it was more to do with the expected results during each stage.

So we might be alright hopefully
If not, it'll only be one or two marks - let's hope I don't need them

Wayne

 

[eyeballblim]

Hi gents I did mine last night as well and it seems it was the same one. Can any of you guys remember what you got for the R1 + R2 on the ring

I got 0.065, but i think I might of got it wrong! I remember getting 0.13 ohms for the induvidual loops, so
0.13 line + 0.13 cpc /4 =0.065 what did you get???

can you remember the length of the circuit? from my calcs above it must have been 17.5m ish.
i.e 0.13 divided by (7.41/1000) =17.5 meters. but i think i may have fu%ke! it up.

What did you get for zs on lighting circuit?? I think i wrote 0.9 ohms.. again I cant remember the length of the circuit to sit here and work it out!! im assuming it was some thing like the following....

ze =0.4
r1+r2 = (7.41+7.41/1000) x by length (35m) = 0.5187 ohms

zs = 0.5187(r1 +r2) + 0.4(ze) = 0.9187 (but i think i rounded down to 0.9 wrongly)

cant stop thinking i got its so wrong cus i was rushing questions 21 - 30!!

 

[Jurasic Spark]

The Zs path diagram was for 1 of the lighting circuits supplied from the new DB. It didn't say where the DB was located. Were we supposed to include a sub main in the diagram?????

 

[eyeballblim]

The Zs path diagram was for 1 of the lighting circuits supplied from the new DB. It didn't say where the DB was located. Were we supposed to include a sub main in the diagram?????

Lets hope not!!

 

[Shaw86]

The distance of the electrodes are 30m but if the potential electrode is 30m away in one direction and the current electrode is 30m in the other direction the distance between the two electrodes is 60m. thats how i answered the question anyway.

 

[Risteard]

The distance of the electrodes are 30m but if the potential electrode is 30m away in one direction and the current electrode is 30m in the other direction the distance between the two electrodes is 60m. thats how i answered the question anyway.

The potential electrode goes halfway between the electrode under test and the current electrode, and is then moved 10% in either direction for the second and third tests.