2394 Chief Examiners Report December 2013

[casfan]

Hi all

I'm doing the 2394 exam next week, probably before I'm ready for it but I had the opportunity so took it, I've already completed the week long course and passed the multiple choice exam. I found the Chief Examiners Reports for the 2394/5 and posted a tread with links on yesterday which Paul.M made into a sticky. I'm working through the December report and some of the questions I can confidently answer, others are proving more difficult and I could do with somebody telling me if I'm right, wrong or to rephrase the answer for C & G purposes. I don't want someone to tell me the answer but if i'm wrong and miles out a push in the right direction would be appreciated. I'll only copy and paste the questions I'm struggling with and the answers that I've got, if anybody is struggling with other questions that I've not put up let me know I can possibly help you with the answer. I do have the wiring regs, osg, gn3, Kitchers book and a Linsley level 3 book.

Link to report: http://www.ett-ni.org/media/2394-302-chief-examiners-report-december-2013.pdf

Below are questions and answers from the first section of the report that i'm not sure about, I'll post more if this goes well.

All feedback appreciated

Thanks in advance

Casfan

Knowledge of BS 7671 and Guidance Note 3

Many candidates struggled to list labels that one would expect to find on a three-phase installation.

• earthing and bonding notice
• Next inspection notice
• Procedure to be followed if a fault is indicated during testing - some candidates stated that it should be noted on the Certificate

Recommend to the person responsible that the circuit is isolated and the fault needs to be repaired before the the circuit can be tested.

• why tests are required to be carried out in a set sequence

• Safety reasons, dead testing followed by live testing
• Reduce risk of havng to go back and repeat tests which have already been carried out should a fault be found

• what should be recorded on the schedule of test for each test

• Circuit number
• Circuit description
• Overcurrent device
• Conductor details
• Insulation resistance
• Zs

 

[happysteve]

Hi Casfan,

I've not taken the 2394 (or 95) but we're covering inspection and testing at the moment on my 2365 course. See below for suggestions.

I'm doing the 2394 exam next week

Remember that 2394 is all about initial verification.

Link to report: http://www.ett-ni.org/media/2394-302-chief-examiners-report-december-2013.pdf

Many candidates struggled to list labels that one would expect to find on a three-phase installation.

• earthing and bonding notice
• Next inspection notice

The 3 phase installation might have RCDs. The user still needs to test them every 3 months.
---> "Danger 400V" might be handy. <--- EDIT: no, this is wrong, apparently! Have just read the examiner's report. Shows how much I know!
I'm sure there are others.

Procedure to be followed if a fault is indicated during testing - some candidates stated that it should be noted on the Certificate


Recommend to the person responsible that the circuit is isolated and the fault needs to be repaired before the the circuit can be tested.

No. This is an initial verification. If a fault is indicated, the source of the fault needs to be determined, and it needs to be fixed so that there are no faults.

why tests are required to be carried out in a set sequence

• Safety reasons, dead testing followed by live testing
• Reduce risk of havng to go back and repeat tests which have already been carried out should a fault be found

Pretty much, yes.

what should be recorded on the schedule of test for each test

• Circuit number
• Circuit description
• Overcurrent device
• Conductor details
• Insulation resistance
• Zs

Yes, and all the other relevant things that are in each row on the Schedule of Test Results (see any of the books you've got). Some will not be relevant, eg if it is not an RFC, you will not need to fill in r1, r2, rn.

These are just my guesses without reference to any books/internet.

Good luck with your revision and your tests

 

[Richard Burns]

I'm doing the 2394 exam next week

Knowledge of BS 7671 and Guidance Note 3

Many candidates struggled to list labels that one would expect to find on a three-phase installation.

• earthing and bonding notice
• Next inspection notice
• Procedure to be followed if a fault is indicated during testing - some candidates stated that it should be noted on the Certificate
• Look in section 514 at the possible notices, NOTE WHAT THEY ARE CALLED and see which ones would be suitable (the 3 phase is a bit immaterial) however remember it is the installation not just the DB.

Recommend to the person responsible that the circuit is isolated and the fault needs to be repaired before the the circuit can be tested.
As Happy Steve says

• why tests are required to be carried out in a set sequence

• Safety reasons, dead testing followed by live testing
• Reduce risk of having to go back and repeat tests which have already been carried out should a fault be found

Expand a bit on safety reasons, what are the reasons?

• what should be recorded on the schedule of test for each test

• Circuit number
• Circuit description
• Overcurrent device
• Conductor details
• Insulation resistance
• Zs

For each test? is that the actual wording? as each test would mean that: for the R1+R2 test you would record the highest R1+R2, for the IR test you would record........
If it were for each circuit then this would vary depending on the type of circuit and protective measure.
If it were asking which values would you always put down for any circuit then this can be determined by reading the schedule of test results and eliminating any that may not arise.
From your list I would say you need to list more items. (remember this is based on the BS7671, OSG or GN3 model forms.
However the question wording needs to be clarified.

thoughts in red

 

[casfan]

Thank you happysteve and Richard Burns for your replies. Exactly what I was looking for. I'm going to keep going through this report, any more feedback will be appreciated!