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

[john25]

There was a question at the start, what 3 tests would be carried out first on a three phase supply to (can't remember what it was but I had never heard of it)?

A 3-Phase Kiln (Iv'e never heard of it before either) so just played it safe with the Continuity of Protective conductors/Insulation resistance/Ze tests

 

[CRAGS]

Good luck all that took exam don't know what is worse the exam or the wait

 

[johnmcbride]

Ye that's exactly what I put. Am sure I read somewhere on here that someone got their exam results within 2 weeks. There was only about 10 of us doin it so I cant c it taking much longer.

 

[telectrix]

A 3-Phase Kiln (Iv'e never heard of it before either) so just played it safe with the Continuity of Protective conductors/Insulation resistance/Ze tests

a kiln is basically an oven, usually used for firing pottery. so asfaik, just heating

 

[john25]

a kiln is basically an oven, usually used for firing pottery. so asfaik, just heating

So what would the first 3 tests be on the oven then mate ???

 

[paulanderson22]

I put:

continuity of protective conductors
ir
polarity

 

[IQ Electrical]

I put:

continuity of protective conductors
ir
polarity

Spot on.

 

[paulanderson22]

Im sure everyone who sat this exam would agree that it was a bit of a nightmare! I think i did quite well bar a few things. q26 : 30ma for additional protection. half test full test both cycles and functional didnt put 5 times. 5 times needed for functional? head was battered by that point!
q2 anyone know the statutory document the dno have to abide by? surely that cant be a 2391 requirement!!
earth electrode resistance question. i answered with an earth loop tester rather that earth electrode. i think both answers would get marks but ive noticed a bit of confusion on this question, no where in the scenario does it mention there is rcd protection. the first mention is in q26. we know there will be but what are we getting marked on, something we know would be there or the scenario they have laid out?? i went through this with my tutor after the exam and he seems to think both answers would pick up marks.
After studying years of past papers i would deffo say this is the hardest exam out of them all!
i was hoping for a 15 mark question on rule of thumb values or insulation resistance!
noticed this is the first exam to have 2 questions that required description and diagrams of 2 test procedures! my hands still in cramp!
im quite confident but i dont this this exam was an easy one to pass!

 

[john25]

Spot on.

hmm Even though Polarity is the next test after IR i've seen Ze being an acceptable answer too on past paper and the Exam success book. so hopefully I still get the 3 marks as you can also confirm Polarity via the EFLI test.

 

[paulanderson22]

i thought it was. polarity can be found as a dead test and its laid out in gn3. could argue it but im sure every answer should be derived from gn3

 

[john25]

Im sure everyone who sat this exam would agree that it was a bit of a nightmare! I think i did quite well bar a few things. q26 : 30ma for additional protection. half test full test both cycles and functional didnt put 5 times. 5 times needed for functional? head was battered by that point!
q2 anyone know the statutory document the dno have to abide by? surely that cant be a 2391 requirement!!
earth electrode resistance question. i answered with an earth loop tester rather that earth electrode. i think both answers would get marks but ive noticed a bit of confusion on this question, no where in the scenario does it mention there is rcd protection. the first mention is in q26. we know there will be but what are we getting marked on, something we know would be there or the scenario they have laid out?? i went through this with my tutor after the exam and he seems to think both answers would pick up marks.
After studying years of past papers i would deffo say this is the hardest exam out of them all!
i was hoping for a 15 mark question on rule of thumb values or insulation resistance!
noticed this is the first exam to have 2 questions that required description and diagrams of 2 test procedures! my hands still in cramp!
im quite confident but i dont this this exam was an easy one to pass!

there was a BS EN 61008-1 RCD in the scenario it was at the bottom mate but I didn't see anything about it being for Fire protection

 

[paulanderson22]

****! your right there was! haha nightmare!

fingers crossed then!
in fairness im assuming very little or no marks on that question anyway!

 

[IQ Electrical]

Im sure everyone who sat this exam would agree that it was a bit of a nightmare! I think i did quite well bar a few things. q26 : 30ma for additional protection. half test full test both cycles and functional didnt put 5 times. 5 times needed for functional? head was battered by that point!
q2 anyone know the statutory document the dno have to abide by? surely that cant be a 2391 requirement!!
earth electrode resistance question. i answered with an earth loop tester rather that earth electrode. i think both answers would get marks but ive noticed a bit of confusion on this question, no where in the scenario does it mention there is rcd protection. the first mention is in q26. we know there will be but what are we getting marked on, something we know would be there or the scenario they have laid out?? i went through this with my tutor after the exam and he seems to think both answers would pick up marks.
After studying years of past papers i would deffo say this is the hardest exam out of them all!
i was hoping for a 15 mark question on rule of thumb values or insulation resistance!
noticed this is the first exam to have 2 questions that required description and diagrams of 2 test procedures! my hands still in cramp!
im quite confident but i dont this this exam was an easy one to pass!

You must perform the 5X I delta n test on a 30mA RCD/RCBO.

The DNO document is ESQCR 2002

Traditionally, the EFLI tester was used on TT earth electrodes and the earth electrode resistance tester on earth electrodes for generators.

 

[paulanderson22]

thats why i went efli because the only knowledge ive got of the electrode tester is on generators. plus i dont know enough detail of that test procedure to pick up full marks!

i hope everyone labeled the general mass of earth on their diagrams!

 

[john25]

You must perform the 5X I delta n test on a 30mA RCD/RCBO.

The DNO document is ESQCR 2002

Traditionally, the EFLI tester was used on TT earth electrodes and the earth electrode resistance tester on earth electrodes for generators .

Yep there the answers I put down on the relevant Questions used a EFLI tester cause there was a RCD protecing the TT system and even though I said I would do a 10-Step safe Isolation procedure I screwed up by carrying out a single phase test grr.

 

[john25]

thats why i went efli because the only knowledge ive got of the electrode tester is on generators. plus i dont know enough detail of that test procedure to pick up full marks!

i hope everyone labeled the general mass of earth on their diagrams!

arrrrrgh NO I did not lol. oh well the way im looking a this now is that it did not cost me anything to do the course and now I know what to type of questions to expect if I need to re-sit it again

 

[IQ Electrical]

hmm Even though Polarity is the next test after IR i've seen Ze being an acceptable answer too on past paper and the Exam success book. so hopefully I still get the 3 marks as you can also confirm Polarity via the EFLI test.

If you're looking at page 39 in Exam Success, you'll see that Ze is only listed in the first 3 tests on a ring final and that is because polarity is already confirmed in the ring final continuity tests.

 

[paulanderson22]

looking at answers people are giving i have missed a bit of detail out! nightmare!
i paid nearly £800 for this course and it looks like ill be paying a resit!!

 

[SMB]

Good luck with your results guys.

The 2391 is a difficult exam to pass indeed.

It took me 45 working days to get my results, the waiting is a killer I know. I spent so much time going over my answers in my head during that waiting time. Then 3 months later I was given the date for my 4 hour practical assessment. That was a definate flaw in my course!

All the best, I hope it goes well for you all.

 

[Paul.M]

Q. Why can't you use Zs - Ze to work out your R1+R2?