tonights 2391 exam....(10th march 2011)

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Discuss tonights 2391 exam....(10th march 2011) in the Electrician Courses : Electrical Quals area at ElectriciansForums.net

L

lynj

one thing to say and that is did c&g forget how to be staightforward? :rolleyes: felt like some of the questions were half thought......

anyone else take it?
 
Yep I've just finished it an hour ago and if I haven't passed it I'll donate £100 to the forums charity. Don't get me wrong, I'm not super smart or highly intelligent but they just kept on asking questions that I knew (well most of them).

Anyway panic over and concentrate on the practical on Wednesday of next week.

Hope everyone that took tonight test knows about TT systems ;);).

Let's see what others say and tell us how they did.

Ps welcome lynj.
 
had a feeling earth electrode testing was going to come up, so i over revised it :D , also what did you work out as the maximum operating current for 26 a?
 
Arrrgh I screwed uyp my TT drawing by drawing the Installation Electrode straight down from the MET Hopefully the Examiner takes pity as I used coloured pencils and Labeled everything up :p

Anyways I answered all but 2 questions so hopefully I passed.
 
was told by my instructor not to bother too much on TT as it does'nt come up much, ****, ****,****, when's the re-sit lol
 
Last edited by a moderator:
Yep I did it

Half of the lads did the earth electrode test with a loop meter, half with a earth electrode tester, being an RCD tt system I opted for loop meter, checked after and was told correct, nailed the loop diagram and ir test procedure of the lighting SWA cable only, got RCD wrong as I put 300ms instead of 200ms , section a , very easy, fingers crissed
 
It was a BS EN 61008-1 RCD which for some strange reason had it in my mind as a 30mA RCD for additional Protection so did a 7 step RCD test procedure for Q26

BS = 200ms

BS EN = 300ms
 
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I thought that the maximum operating current was worked out as 50v/Ra=in. Is RA not the resistance of the electrode, which was 100 ohms giving an answer of 500mA?????
 
filrobbo said:
I thought that the maximum operating current was worked out as 50v/Ra=in. Is RA not the resistance of the electrode, which was 100 ohms giving an answer of 500mA?????
Click to expand...

If they were the figures given then you are correct.

Also, there would be no test at 5X I delta n
 
I thought it was well hard! For the IR test I said test between L+N together and cpc @ 250V because of the voltage sensitive photocells! I think I flunked it also the electrode test was it right to say test between disconnected earth conductor to L1 L2 and L3 in turn and record highest as 3phase installation?
 
john25 said:
lol it was a 10 point question so Automatically assumed it was a 30mA as you only do a couple of tests for the other RCD's no 5X Tests
Click to expand...
Same as, also did the equation but used the wrong resistance ( I think ) , this is what happens when you take a 8 year break from electrics and the boss dumps you in it !
 
What did you guys put for the three practical considerations before a periodic? ... And where the hell was the 1 over rt banker question!
 
Silly quote of the day, just before I leave for my exam my Mrs says "knock em dead babe", I tried to point out that this is exactly what the 2391 is trying to protect against lolololol.......
 
Question asked you to IR test SWA section of lighting circuit only!, disconnect at the service cut out at base of column, so u didn't have to lower the test voltage because of photo cells
 
What did you guys put for the three practical considerations before a periodic? ... And where the hell was the 1 over rt banker question!​
Click to expand...

Hi soren I said there may be people in the shop, there may be boats banging against the jetties and there may be bad weather!! All i could think of lol crapp answers, what did you put?
 
I just left it blank and came back to it and guessed at notifying the installation users, checking for signs of obvious dangers and check earthing system! I didn't really get the question to be honest as I was focused more on what I need to do as part of the test and record.
 
With the ir test isn't it best to just quote the test as in gn3? I.e. Make reference to removing any voltage sensitive equipment or link out where applicable and not leave out steps based on the fact your just testing the swa?
 
what an absoloute nightmare!

Also done it tonight and flew through the first twenty realy happpy and then read the scenario!

It was SO unclear! How many dbs were there? i went for three in the end, one main, one shower and one shop? I dont understand how city and guilds being that unclear shapes us any better to test by being able to second guess them!

Completely buggered up the q.26 i worked out the safe touch voltage came out with 500ma like others, left and realised like many it was a special location on additional protection so 30ma :-( guttted. Also messed up the i.r test, put to test at 500v dc with combined line and neutral. Do that and disconnect the cut out fuses. bugger.

Can someone remind me of the 6 big questions again? got the fault path but only showed one db and the met in that with cpc and main conductor to the electrode.

Really annoyed roll on june
 
Question specifically asked for IR test of SWA only so I didn't argue!, it also stated that the Columns were pre wired flex, that was to me another clue as to why the IR test stopes at the base of column

Rcd was it additional 30ma!, if so I'm chuffed as I thought I'd bollixed it up
 
Gra said:
Completely buggered up the q.26 i worked out the safe touch voltage came out with 500ma like others, left and realised like many it was a special location on additional protection so 30ma :-(
Click to expand...

Not Sockets
So you are correct about 500mA
 
sornen said:
What did you guys put for the three practical considerations before a periodic? ... And where the hell was the 1 over rt banker question!
Click to expand...

Myself,

Put down disruption to the office area so work to be carried out of hours.
Disruption to the shop which could cause loss of trade so work carried out of hours again.
Inconvience working in the toilet/shower blocks so only carrying work out on one block at a time.
 

quote_icon.png
Originally Posted by Gra
Completely buggered up the q.26 i worked out the safe touch voltage came out with 500ma like others, left and realised like many it was a special location on additional protection so 30ma :-(



Not Sockets
So you are correct about 500mA​
Click to expand...

I can't remember what Q26 asked now, I definately put 30mA because it was for additional protection. Then the test procedure was quite a few marks so must have included 5 X IAn as someone said earlier then the last part of the Q quoted the max disconnection time of a TT as 0.2s so I said the BSEN should be replaced with a BS to match the 200ms max permitted disconnection time. Well you don't have to get them all right do you lol
 
on section b

did they directly say the main switch was a 200 ohm rcd? if not thats why I went down the earth electrode resistance test route :X
 
Thought that the wording of questions throughout was atrocious. Re the SWA cable - don't remember them asking only to test the cable, although the wording was crap, but they did ask for details of circuit preparation which I took to mean that they wanted the whole thing tested. For a 2 1/2 hr written exam you don't really need confusing questions.
 
newby said:
Thought that the wording of questions throughout was atrocious. Re the SWA cable - don't remember them asking only to test the cable, although the wording was crap, but they did ask for details of circuit preparation which I took to mean that they wanted the whole thing tested. For a 2 1/2 hr written exam you don't really need confusing questions.
Click to expand...
ahh the good old city and guilds way of having you wonder what the question actually is. had plenty of them over the years. ambiguous sods they are :)
 
Well I felt terrible about this exam till I read half these posts, seems everyone found it confusing! Can anyone remember what they put for 21a? I think it was asking what documentation would be provided and what it would be provided for. I took this to mean electrical installation certificate for new circuit, periodic inspection report for installation testing, am I on the wrong lines cos I did have to read it a few times!
 
as phil stated cityand guilds have always made the questions on 2391 confusing,this i believe is on purpose as if they believe you should be able to work out whats required with limited input.
r
 
I think that I put down two sets of periodic inspection reports, schedule of inspections/tests for the existing aspects, and one of electrical installation cert, schedule of inspections / tests for the new circuit.
 
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