C&G 2391

[ColJack]

just on my way out the door to do my theory test, wish me luck...

 

[dingbat]

Good luck.

Don't spend too much time reading that overly-long scenario in Part B... you don't need half of that information if the last five exams have been anything to go by!

 

[ColJack]

2 1/2 hour exam, finished it in 1:20, had re-checked my answers by 1:30, then sat there for the last hour..

one or 2 questions i was not 100 sure of..

1. for a T-N-S system, calculate the maximum permisable Zs of a 30mA rcd.. ( no other info given.. )

i worked it out ( after an epiphany at 1:50.. good job I sat there... ) that it was 50/30mA = 1666 ohms... this sounds high for me but is ok to the regs for dry locations on TT systems..
can't find the formula for T-N-S systems though..

looks like i messed up the IP ratings too...

state the minimum IP rating for the following..

a) a surface mounted switch in an office
b) electrical equipment in zone 2 of a bathroom
c) the terminal cover of a 3 phase motor..

i put

a) IP4x
b) IP56
c) IP4x

b is wrong for sure.. went too high..
only has to be IPx4 or IPx5 where water jets are likely for cleaning in comunal bathrooms or shower rooms.

 

[dingbat]

2 1/2 hour exam, finished it in 1:20

That's either very good indeed, or not good at all. I usually finish in about an hour-and-a-half, but I get lots of practice.

We'll keep our fingers crossed.

 

[LearnerSPARK]

I didn't get that question about the Zs either, everyone I sat it with was a bit stumped by that one aswell

The IP ratings I know you got c) right the question asked for the horizontal surface cover of a 3 phase motor which you're right is IP4X a) I thought was IP2X or IPXXB the BS finger probe not sure though

Best of luck with your results fella

 

[ColJack]

think we could re-create the test paper here between us? our lecturer wanted a copy for his "past papers" pile, but we couldn't sneak one out..

 

[RobFurn]

Hi ColJack

Did the theory exam last night as well, got stuck on the same questions as you and so did the rest of our class, the rest was pretty straight forward though especially part B (rule of thumb how many times please!)

 

[Spark123]

2 1/2 hour exam, finished it in 1:20

That's either very good indeed, or not good at all. I usually finish in about an hour-and-a-half, but I get lots of practice.

We'll keep our fingers crossed.

Do you have access to the model answers? I haven't got around to doing the exam yet!!
Not sure on the TN-S question, the maximum to the 50v rule is 1666ohms but in some special locations this is halved (i.e. 25v rule). In reality, if we got a reading of anywhere near this on a TN-S I think most of us would be looking for the problem(s).

 

[dingbat]

Do you have access to the model answers?

Sadly, no.

C & G have become very keen on hanging onto the papers. Those from the Brian Scaddan era were pretty much in the public domain and exams had become very predictable. The new brooms are looking for proper understanding, rather than cramming past papers.

 

[Spark123]

Have you got the ones from over on the SparkyHeaven website?
http://groups.msn.com/SparkyHeaven/learningzone.msnw?fc_p=/Learning Zone/2391 Documents&fc_a=0
Just looking at the March 07 one, doesn't look as bad as some I have seen!

 

[ricicle]

Why can I never open Sparky Heaven links?

 

[Spark123]

Can you open either of these links?
http://groups.msn.com/SparkyHeaven
http://groups.msn.com/SparkyHeaven/frontpage.msnw
Have you got a msn or a hotmail account? I think you need to be logged in on this in order to access sparkyheaven and registered in order to post. If you have a nosey over on the IET forum I think it is rocknroll which set it up.

 

[ricicle]

Yeah, I can open that link.I did register with the hotmail account but still could not open the links from the IET for a long time now

 

[Spark123]

How far can you get into sparkyheaven?

 

[ricicle]

How far can you get into sparkyheaven?

I can view pictures but not documents.