Just Finished june 14 2391

[mills.phil]

Hi has anybody else just done the 2391 today just got home how do you think you have done

 

[glennprice]

Billy all your answers sound better than my answers! All I'm really hoping for on that question is to srape a few marks but thinking looks like a 0

 

[AndyL]

May have a problem with some of the answers above if the question is talking about inspection within the board as would not expect to see the mentioned labels there, other than that cant see much wrong

 

[BillyBigBalls]

I think the opposite Glen (sorry I got the name wrong, I should quote, I am still drunk), I think the question was "practical" things you were looking for, giving examples. I am not sure I did that for everyone. I tried to state word for word out of GN3. I hope I will still get marks for it.

 

[mills.phil]

Why not talk about metal db earthing steel trunking earthing and size of mcb to cable size

 

[BillyBigBalls]

Some other questions and stupid things that I did wrong are flooding back to me.

State 3 services that would be connected to bonding? (not word for word)

Metal Gas Pipe, Metal Water Pipe, and my mind went blank.

Two methods for determining Voltage Drop?

Argh...Calculation and Direct measurement.

3 methods of achieving compliance if Zs do not comply?

Increase CSA of conductors
Increase rating of protective device
Additional protection by 30mA RCD ???

Draw a TN-C-S earthing system, earth fault loop path for the lighting circuit.

I drew the generic earth fault loop path diagrams for a load, but added a lighting circuit to it. The thing that gets me is the generic drawing you find everywhere does not show the circuit breaker operating, so I hope that is fine. I also (trying not to swear) missed out the supply earth electrode, I only put the additional one, how I messed that up, I just had a bad day.

There was also 2 calculations if I remember right. One was m ohms/m and other R1+R2. Was the R1+R2 a ring circuit?

 

[mills.phil]

Billy the metal work of the building the three methods i put the same and for the voltage drop the same TNCS i did not say the lighting i just put load

 

[BillyBigBalls]

Billy the metal work of the building the three methods i put the same and for the voltage drop the same TNCS i did not say the lighting i just put load

Cheers Phil, the metal work of the building did not occur to me. I struggled with a third answer for that one, played on my mind for the rest of the exam. In the end I just said heating and ventilation metalwork lol

 

[mills.phil]

You never know with the exam paper marker he may like this ??

 

[Android Marvin]

I did much the same as Billy, I did put checking for loose connections to achieve compliance with Zs.

Bit worried about the questions on IP rating in Zones 1 and 2. Didn't give that much thought, only really thought about IP ratings at the DB when I studied. Hopefully don't drop too many marks.

 

[AndyL]

3 methods of achieving compliance if Zs do not comply?

Increase CSA of conductors
Increase rating of protective device
Additional protection by 30mA RCD ???

Sorry Billy bad news, increasing the rating of the protective device would mean Zs needs to be even lower, you could possibly have changed the type

 

[BillyBigBalls]

I think there were 2 calculations needed, can't really remember exactly. One was m ohms/m calculation of 2 conductors. Was that an R1+R2 for a ring?

 

[Android Marvin]

You never know with the exam paper marker he may like this ??

That's the problem with non multiple choice questions, it is all up to the exam paper marker to see if he thinks you've done enough.

THE SUSPENSE IS GONNA KILL ME!!

 

[mills.phil]

We could go round to his house and see if he/she would like a hand with the marking

 

[BillyBigBalls]

Damn it. I knew I was doing something wrong in that question. I've dropped marks on all of those questions. I think I will be doing a resit, not a bad thing really because I will learn more, but all the revision needed for this exam takes up a lot of time.

 

[Android Marvin]

The problem is my work say that it'll be OK if I fail, everyone deserves a second chance. Think of the pressure if I have to re-sit, don't think they'll give me an infinite amount of chances.