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

[lynj]

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

anyone else take it?

 

[Paul.M]

Q.a) In the shower unit, what visual inspections can you do to the c/u (4 marks)

Unless I misinterpreted the question I believe it was a visual without taking the front panel off so I put i) damage, ii) labels, iii) correct size rcd, iv) correct size mcb. These are the things that we do naturaly without thinking, like tying your shoes laces but try and describe in writing how to do it?

 

[russty]

How about measurement and calculation?

You can physically measure the voltage drop or calculate it from cable length/size/load

Just couldnt think of anything else!

 

[john25]

If it said 'only from the DNO' then it's something you can't measure or visibly confirm so it has to be from the characteristics of the sealed supply fuse eg. BS, type, rated current and short circuit capacity.

I suppose you could get away with supply frequency.

I went for Ze and Maximum demand on that question

 

[john25]

Q.a) In the shower unit, what visual inspections can you do to the c/u (4 marks)

Unless I misinterpreted the question I believe it was a visual without taking the front panel off so I put i) damage, ii) labels, iii) correct size rcd, iv) correct size mcb. These are the things that we do naturaly without thinking, like tying your shoes laces but try and describe in writing how to do it?

It was a Visible check mate thats why I went for Damage/ labels Correct connection of conductors and damage to IP integrity of the DB

 

[johnmcbride]

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)?

 

[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