Page 87 - Electrician - TT (Volume 1)
P. 87

ELECTRICIAN - CITS



                          MODULE 4 : Electrical Wiring Practice, Earthing



           LESSON  20-25  :  National  codes,  common  electrical

           acccessories , types of wiring earthing


            Objectives

           At the end of this lesson you shall be able to:
           •  state NEC, general wiring roles BIS symbols used for electrical accessories
           •  classify specific, user of the accessories in domestical wiring
           •  state the IE rules related to safety & electrical supply
           •  explain wiring of MCB, MCCB, ELCB, residual current circuit breaker
           •  state the types of wiring testing methods - domestic wiring instrumental megger
           •  earthing types of earthing methods reducing earth resistance, earth tester.


           National electrical code
           Thousands of people die every year due to electrical accidents fire has destroyed property worth million of rupees.
           Fires in building are due to electrical reasons. The main reasons for electrical accidents are poor design and
           quality of electrical installations, maintenance, workmanship issues & very old installations.
           Bureau of Indian Standards 9BIS) through its electrical installations sectional committee. (ETD-20) under ETDC
           is responsible for the preparation of Indian Standards for Safety and related matters in its designing, erection &
           maintenance of electrical installations
           BIS has revised the National Electrical code of India which was released on January 6, 2023. BIS updated the
           NEC to align with international practices.
           This state of the art code establishes the basics of electrical safety in India.
           The NEC consists of 8 parts and 49 sections covering different aspects of electrical installations.
           Part 1: General & common aspects (22 sections)
           Part 2:  Electrical installations in standby generating stations & capacitive substations (2 sections)

           Part 3: Requirement for special installation or location (22 sections)
           Part 4: Electrical installations in industrial buildings
           Part 5: Outdoor installation (3 sections)
           Part 6: Electrical installtions in agriculture premises

           Part 7: Electrical installations in hazardous areas
           Part 8: Solar Photovoltaic (PV)
           Power supply systems
           Protection measures
           The NEC provides protection measures including
           1  Protection against electric stock

           2  Protection against thermal effect
           3  Protection against over current & short circuit current
           4  Protection against, erction & verification of electrical installation.






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