The electrical inspection and testing qualification currently known as the City and Guilds 2395 Level 3 Periodic Inspection, Testing and Reporting of Electrical Installations is definitely one of the best electrical qualifications to have. This was previously known as the City and Guilds 2391. This qualification is not as easy as many people think and a lot of electricians say that this separates the men from the boys. The pass rate for this qualification in general is below the 50% mark, but you do get some anomalies where in August 2013 the pass rate was at 62%.

In order to pass the C & G 2395 you should definitely have decent practical experience and know guidance notes 3 fairly well. If not you will not pass this test. I have heard stories where people did the courses with other people who worked as taxi drivers and take-away chefs expecting to pass their inspection and testing. This is just not going to happen and if you want to pass this qualification then you need to know your stuff.

The assessment (Principles, practices and legislation for the periodic inspection, testing and condition reporting of electrical installations) consists of an:

  • Online multiple choice test 301
  • Written test 302
  • Practical assignment 303

Full break down of City and Guilds 2395 course units:

2395-301 online multiple choice test 80 minute duration

Outcome

Number of questions

%

1 You have to understand what is required for completing the safe isolation of electrical installations and circuits.

7

18

2 You have to understand the requirement for electrical inspection and testing of electrical installations and recording the condition thereof installations

2

5

3 Understands the requirements for the safe testing of electrical installations which havebeen placed in service

9

22

4 Understand the requirements for testingcircuits which have been placed in serviceand may require isolation

7

18

5 The requirement for testing installations that have been energised

13

22

6 Understand and interpret test results

2

5

Total

40

100

 

2395-302 Written exam duration 90 minutes

The 2395 written exam has been reduced from the 2391`s 2,5 hour test to a 90 minute test. This is because you now also do an online test. The test normally consist of up to 6 questions each counting up to 15 marks.

This obviously means that it will not be any short answer questions, because that is covered in the online test. Usually you will be given a description of an installation with the supply type, Ze, what type of cabling is installed, if there have been any alterations and various other details about the installation.

From that you will be asked questions about the installation and how you would perform certain electrical tests on the installation. You can also expect some questions about the completion of the electrical installation condition report.

This is the exam where most people struggle. If you complete previous exam questions and learn the testing procedures as outlined in your Guidance Notes 3 (GN3) then you should have no difficulty in passing. One thing to add is that time is against you and you should not dwell too long on a question, just move onto the next question and come back when you have completed the other questions.

Tips for Passing the C & G 2395 Written Exam:

  • Remember to use the proper symbols when giving your answers such as Ω, KA.
  • Show all calculations when working out sums.
  • Be sure what test instrument are used for what purpose. In the examiner`s report he has identified that certain people were unable to say what type of test instrument needs to be used for testing the earth electrode for a generator. In case you are wondering it I the earth tester with the spikes you put in the ground.
  •  Do not confuse inspection and testing requirements with periodic inspection and testing requirements. Initial verification is the City and Guilds 2394.
  •  Learn your earth fault loop diagrams. It is not that difficult to remember to remember the diagrams. Study the different earthing systems and then the paths the fault current would take. Also remember to label all the respective parts. You will not get all the marks of you forget to add the appropriate labels to the earth fault loop diagram.
  •  Many candidates do not know what the purpose is of protective bonding. The purpose of protective bonding is that during an electrical fault where there is a line conductor in contact with an exposed conductive part, that sufficient fault current flows to operate the disconnection device. This will be a fuse, RCB or circuit breaker. It is also there to reduce the touch voltages between exposed conductive parts in the event of a fault on the installation or an open circuit PEN conductor in a PME supply.
  •  Just study. There is no replacement for just knuckeling down and working out past papers. You will see a pattern in the type of questions they ask, and the more you do the better you will be able to identify how to best answer these questions.

 

You need this book to pass your practical and theory tests .pass your C&G 2395 with GN3

2395-303 Practical assessment

The practical part of the 2395 consists of a periodic inspection and testing on an installation. You have a total of 90 minutes to do the testing and then a further 30 minutes to complete the relevant paper work. According to City and guilds you are allowed to use your BS 7671 and GN3.

Despite what some people might say, you do not have to complete your testing in the sequence as you would do with initial verification. However this might differ from examiner to examiner. If they tell you do it in the sequence they tell you then you will be better off doing it their way. If you do not then they will fail you, and challenging them on it will probably not get you very far.

There are also 2 faults to identify out of a possible 7 that the assessor can put on the rig. This could be something like a low insulation resistance, to an open ring circuit. There are not difficult faults trying to trick you, but rather faults you should pick up if you do the tests and interpret the test results correctly.

You will have 30 minutes where the assessor will show you 8 photos out of about a possible 20. You will then need to state what faults there are on the photos of any and state the code of the fault (C1, C2, C3)

You will do an insulation resistance test on a small single phase CU. Here you would have to identify 2 faults which would either be a short circuit, low resistance or and earth fault. This is very straight forward and should not pose a problem of you know how to work with an insulation resistance tester.

You can also expect to take 2 earth fault loop impedance measurements on a simulator. You will be informed of the type and rating of the protection device after which you have to look in your BS 7671 if the values you got was acceptable or not. You need to keep in mind to apply the “rule of thumb” where you multiply the number by 0.8. You can make a small bookmark in your book to where the tables are located, because it will cost you if you take too long to try and find them.

You are pressed for time in the practical part and have quite a few things to remember. Sometimes a small thing like forgetting to prove dead in the correct manner could cost you the whole test. If you do not isolate, lock off and prove dead in accordance with GS38 then you will fail.

City and Guild 2395 test rig

The approved City and Guild 2395 test rig will be very similar to the previous rigs used in the 2394 tests, but as mentioned earlier will have the faults on them. This will include a 3 phase supply feeding a 3 phase DB. From that DB there will be another feed to a single phase board. There will also be some lighting circuits, an isolator with a neon, a dimmer switch, a lighting circuit with 2 way switching, a DOL starter with an isolator and socket outlet ring circuit. It should look very similar to the picture below.

Normally you will start with the 3 phase board first then complete all the relevant tests and then continue to test the single phase board.

image courtesy  http://www.atlantictraininggroup.com/atlantic-hq-new-eal-testing-rigs/
image courtesy http://www.atlantictraininggroup.com/