"Violation of any provision of this Code shall constitute unethical, unprofessional and dishonorable conduct and the violator shall be subjected to disciplinary action by the Board of Electrical Engineering" EXPLAIN

36. Electrical explosions directly into the face of a person working on or near energized electrical equipment can and will cause serious injury or death. OSHA laws and NFPA 70E have strict safety requirements for working on electrical equipment. The basic rules are to turn off the power before working on the equipment and to wear the proper type of nonflammable clothing. To further provide safety for the worker, the National Electrical Code has a requirement pertaining to arc-flash hazard warning. This requirement is found in a. 110.16 (A) b. 220.1 of the NEC C. 330.1 d. 410.5

The load current in a system is 100 A. the short-circuit current for the smallest fault is     100 A. An overcurrent capable of carrying a current of 5 A continuously is to be used. (a) Suggest a suitable C.T. ratio                  (b) What will be the current for the smallest fault?            (c) Will the protective C.T be able to faithfully reproduce the fault current?

Q4. Explain the operating principle of the circuit breaker and list the merits and demerits of the following circuit breakers: (10 Mark) (i) Air circuit breaker (ii) Oil circuit breaker (iii) SF6 circuit breaker (iv) Vacuum circuit breaker