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Indian regulations in Electrical Safety

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  1. Indian regulations inElectrical Safety P.Lahiri BARC

  2. Repealed under section 185 of Electricity act -2003 Indian regulations. • Indian Electricity Act-1910. • Indian Electricity (Supply) Act- 1948. • Indian Electricity Regulatory Commission Act-1998. • The Electricity Act –2003. • Indian Electricity Rules- 1956.

  3. Objectives of regulations • Make generation, transmission, distribution and utilization of electricity as safe as possible. • Identification of different categories of agencies. • Remove ambiguities from existing qualitative guidelines and pronounce precise quantitative technical requirement with respect to safety.

  4. Categories of agencies • Supplier of electricity. • Consumer of electricity. • Electrical inspector. • Electrical contractor and supervisors. • Authorized persons.

  5. Hazards of electricity • Electric shock:-Current flows through body or part of body when two surfaces having electrical potential difference is touched resulting in burn, disability or even death. • Flashover:-Sudden collapse of electric field by having a conducting path between two electrical potential different surfaces resulting in burn, fire. • Blast:-Failure of dielectric medium between two electrical potential different surfaces resulting in projectile, mechanical force, fire or burn. • Heat:-Caused by loose connection in the circuit, overheating of insulation/ conductor due to overload or prolonged short circuit current etc. resulting in fire, burn.

  6. Quantitative effect of electric current (up to 3sec.) on human (source Daziel)

  7. Flash and flame burn Thermal burns, Current flows typically external, Damage to skin

  8. Electric shock and flash burn

  9. Occurrence of blast EXPLOSION

  10. Classification of rated voltage as per IE rule Extra High Voltage (EHV) Above 33kV 33kV High Voltage (HV) 650V Medium Voltage (MV) 250V Low Voltage (LV)

  11. Authorization • Authorization. • Electrical isolation. • Identification & display. • Restriction of access. • Inspection, testing etc. • Preparedness for adversity. • Other hazard precaution. • Protection & interlocks. • Clearances. • Earthing. • Reporting accidents. • Avoid chaos • Fixing up of responsibility • Ensures expertise

  12. Authorization rule

  13. Authorization cntd.Qualifications rule

  14. Electrical isolation. • Authorization. • Electrical isolation. • Identification & display. • Restriction of access. • Inspection, testing etc. • Preparedness for adversity. • Other hazard precaution. • Protection & interlocks. • Clearances. • Earthing. • Reporting accidents. • Quick de-energization • Ensure de-energization while on work

  15. Electrical isolation(Rule)

  16. LV,MV

  17. 11k,33k or

  18. >33k

  19. Electrical isolation device for transformers (Rule)

  20. Above 1000kVA

  21. Primary HV

  22. 630kVA

  23. Identification & display • Authorization. • Electrical isolation. • Identification & display. • Restriction of access. • Inspection, testing etc. • Preparedness for adversity. • Other hazard precaution. • Protection & interlocks. • Clearances. • Earthing. • Reporting accidents. • Electricity is invisible:- • Various current carrying portions • Different circuits/ phases/ a.c/ d.c. etc. • Different voltages LV,HV,MV etc • Power flow directions. • ON/OFF positions and direction of operation of SFUs/CBs/Isolators. • Source locations of PCCs/ MCCs and load locations of each feeders of MCCs • Danger notices.

  24. Identification & display (Rule)

  25. Restriction of access • Authorization. • Electrical isolation. • Identification & display. • Restriction of access. • Inspection, testing etc. • Preparedness for adversity. • Other hazard precaution. • Protection & interlocks. • Clearances. • Earthing. • Reporting accidents. • Thwart accidental or unauthorized access:-

  26. Restriction of access (Rule)

  27. Inspection testing & maintenance • Authorization. • Electrical isolation. • Identification & display. • Restriction of access. • Inspection, testing etc. • Preparedness for adversity. • Other hazard precaution. • Protection & interlocks. • Clearances. • Earthing. • Reporting accidents. • Ensure adequacy of safety related parameter: • Maintaining safety related parameter within limit.

  28. Commissioning inspection (Rule)

  29. Commissioning inspection (Rule) cntd.

  30. Periodic inspection (Rule)

  31. Preparedness. • Authorization. • Electrical isolation. • Identification & display. • Restriction of access. • Inspection, testing etc. • Preparedness for adversity. • Other hazard precaution. • Protection & interlocks. • Clearances. • Earthing. • Reporting accidents. • Mitigate the effect of fast acting electrical disaster • Ensure correct course of action

  32. Preparedness (Rule)

  33. Preparedness (Rule)cntd.

  34. Possibility of success of artificial respirationsource Edition Electric Institute resuscitation manual

  35. Other hazard precaution. • Authorization. • Electrical isolation. • Identification & display. • Restriction of access. • Inspection, testing etc. • Preparedness for adversity. • Other hazard precaution. • Protection & interlocks. • Clearances. • Earthing. • Reporting accidents. • Reduce potential initiating events of accident

  36. Other hazard precaution.(Rule)

  37. Other hazard precaution.(Rule)cntd..

  38. Other hazard precaution.(Rule)cntd..

  39. Other hazard precaution.(Rule) cntd..Location based on oil inventory

  40. Protection & interlocks. • Authorization. • Electrical isolation. • Identification & display. • Restriction of access. • Inspection, testing etc. • Preparedness for adversity. • Other hazard precaution. • Protection & interlocks. • Clearances. • Earthing. • Reporting accidents. • Avoid human errors

  41. Transformer protection

  42. Transformer protectioncntd..

  43. HV & EHV installations interlocks

  44. HV & EHV installations interlockscntd..

  45. HV & EHV installations protection

  46. Other protections

  47. Time/ Current for a.c 50Hz mSec 50H a.c current (rms mA) Zone 1- Usually no reaction, Zone 2 – Reaction may occur but usually no patho- psychological dangerous effect, Zone 3- No risk of fibrillation, Zone 4- Fibrillation possible (50% probability), Zone 5- Unsafe or fibrillation

  48. Clearances (physical spacing) • Authorization. • Electrical isolation. • Identification & display. • Restriction of access. • Inspection, testing etc. • Preparedness for adversity. • Other hazard precaution. • Protection & interlocks. • Clearances. • Earthing. • Reporting accidents. • Minimum air insulation clearance. • Minimum space to work. • Minimum space for escape.

  49. Clearances for bare conductor other than overhead lines(Rule)

  50. Clearance above ground of overhead lines across/ along a street (Rule)