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These questions are based on the City and Guilds past paper 2396-402, this past exam paper will give potential electrical designers a good base to start on.
Remember the actual exam is 3 hours and has 10 questions, you might think 3 hours for 10 questions is a long time but you will soon find out that you need to explain your answers using the Reg's. and that time will run down very quickly. If you do not know an answer go to the next one and so on then IF you have time go back to the questions you have not answered.
City and Guilds are not looking for you to copy out word for word the regulations, they are looking for your interpretation and ability to use the Following Non Statutory Books
IET BS 7671
IET Onsite Guide
IET Guidance Note 3
IET Guidance Note 1
If you are an Electrical Designer or planning to be, you should own these books and be competent at using them.
A radial final circuit is wired using 70⁰C thermoplastic flat profile twin cpc cable having 6mm2/ 4mm2 copper conductors to a length of 46 m. The final circuit is protected by a 32 A BS 88-2 device. The supply and installation form a single-phase 230 V TN-C-S system with a Ze OF 0.05 Ω which is at the origin of the final circuit. Determine:
a) The value of short circuit current at the end of the final circuit. (7 Marks)
b) If the circuit cables have adequate short circuit protection. (6 Marks)
c) The suitability of the protective device for circuit Zs. (7 Marks)
>>> CLICK HERE TO DOWNLOAD City and Guilds 2396 Electrical Design Past Paper <<<