2391 March Completed

[vernam616]

Came out of the March 2012 exam liteally 30 minutes ago, anyone done it? How did you find it?

 

[sonnyjim]

Just done the exam aswell i also done it in feb one not got my results for at one. I found this one alot easier.

 

[vernam616]

So you took the exam in feb and possiby passed and you took this one?, i didnt realise you could do that

Anyway how did you find the exam? I found it surprisingly easy

 

[wams]

I also did the exam. does any one have questions about certain questions in the paper. Questions that you may have had thought were difficult?

 

[bobbyhowler]

I also did the exam. does any one have questions about certain questions in the paper. Questions that you may have had thought were difficult?

Sequence of tests after the earth electrode rest?

 

[wams]

Sequence of tests after the earth electrode rest?

I got that 1 wrong now that ive looked at GN 3. The test following are:


Protection by automatic disconnection of supply
Earth Fault loop impedance
Additional Protection

 

[eleczar]

I just did the exam to! I think it was quite straight forward however im concerned i messed up the question about checking the carpark radial?

Does that just mean 'checks' ie cable condition, earthing, terminations etc and not any testing as it only stated CHECK.

Also I have never tested an RCBO and in a blind moment of panic i decided you should remove the earth tail from the rcbo ? THis was an idiotic thing to write but will i lose all marks for that question because i answered it pretty well apart from that stupid comment !!!

Apart from that im quite happy !!

How did others find it??

 

[vernam616]

Well for earth electrode question i wrote

Ze - external earth fault loop impedance
PFC - prospective fault current
Rcd test as its said state 3, and it could have been any id of thought


The rest was surprisingly easy, did everyone manage to get the last question correct by applying 80% rule of thumb to the max values?

I got "not acceptable" for the first three and "acceptable" for the last value

 

[wams]

I just did the exam to! I think it was quite straight forward however im concerned i messed up the question about checking the carpark radial?

Does that just mean 'checks' ie cable condition, earthing, terminations etc and not any testing as it only stated CHECK.

You may of had a different paper to me as as I had to write a sequence of test on the continuity of the car park lights that incorporated 2 core SWA.

I may have struggled?

 

[Adam W]

I did it as well. Trying not to think about it because there's a few questions I think I may have messed up.
I got 'not acceptable' for the first 3 results as well, although earlier in the question I said the tabulated figures can be compared to measured results either by multiplying the tabulated by 0.8, or multiplying the measured results by 1.2, which doesn't work.

What did everyone else put for the voltage to test surge protected sockets?
And the voltage to test between SELV and a 400v 3 phase motor?

 

[wams]

I applied the rule of thumb (0.8 factor) but I got unsatisfactory - satisfactory - unsatisfactory - satisfactory.

Can anyone remember the scenario

 

[wams]

i did it as well. Trying not to think about it because there's a few questions i think i may have messed up.
I got 'not acceptable' for the first 3 results as well, although earlier in the question i said the tabulated figures can be compared to measured results either by multiplying the tabulated by 0.8, or multiplying the measured results by 1.2, which doesn't work.

What did everyone else put for the voltage to test surge protected sockets?
And the voltage to test between selv and a 400v 3 phase motor?

500 v d.c

 

[Adam W]

An office wired 12 years ago, BS88 100A main fuse, wired in pvc singles in pvc conduit and trunking.
5 metal bollards in car park wired in 2 core SWA controlled by a time clock and contactor.
3 phase board next to the service head, TN-S earthing.
A new occupier had just moved in and an EICR needed to be carried out, tested at 20°c.

Can't remember much more than that.

 

[Adam W]

500 v d.c

For both?

 

[vernam616]

I wrote 250v d.c purely because SELV was mentioned

The question was about verifying electrical seperation between 400v 3 phase motor and. 25v SELV circuit


As for surge protection i wrote 250v d.c