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Electrical Lighting & Cable Selection<br />D.K.Pathirana<br />
Part 1<br />Finding required number of luminaries<br />
Types of Electrical Lighting<br />Ambient lighting<br />Task Lighting<br />Accent lighting<br />
Ambient lighting<br />
Task lighting<br />
Accent Lighting<br />
Lumen(Luminous flux)  [F]<br /><ul><li>The lumen is defined such that…
At frequency of 540×1012hz, (i.e., at wavelength λ=555nm) 1 watt of radiant flux (power) will emit 683 lumens of light (lu...
Luminaries<br />
Required no. of Luminaries<br />	                            E x Lx W<br />              	N    =   _______________________...
Maintanance factor (MF)<br />Can be defined as…<br />    Averageilluminanceon the working plane after a specified period o...
Lamps Lumen Deterioration (LLD)<br />Manufacturer data….<br />Examples..	<br />Compact fluorescent      0.85<br />	  Mercu...
Reflectance factor<br />the fraction of radiant energy that is reflected from a surface<br />Examples- 70% , 0.8, ...<br /...
Room Index<br />K = (LXW)/ [(H1-H0)X(L+W)]<br />Where,<br />L	=  Room Length (m)<br />W	=  Room Width (m)<br />H1	=  Heigh...
Utilization factor<br />
Example for lighting calculation sheet<br />
Recommended Lighting Levels<br />
Part 2<br />Load calculation<br />
Design  power socket outlets….. If not given<br />Then analyse….<br />
Total load for the new wing    =  Total load for ground floor+1st    						floor+2nd floor……<br />				= 13.503+……+……<br />...
Bill Of Quantity (BOQ)<br />Example<br />
Part 3<br />Cable selection and Over load Protection<br />
Basic types of MCB’s<br />TYPE B<br />TYPE C<br />TYPE D <br />
Sizing the cables<br />length of the wire <br />Check the following inequality<br />	      In<br />		It   ___________  		...
Contd…<br />Refer IEE wiring regulation book<br />Lesser than 4% voltage drop….<br />
Selecting a protective device<br />Nature of the load<br />Rated current of the conductor<br />Environmental conditions<br />
Contd..<br />Ib rated current of protective diviceIz<br />Where, <br />Ib = Design service current<br />Iz = Maximum cur...
Single Line Diagram<br />
Questions……<br />
Thank you<br />
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Electrical Lighting & Cable Selection

Get an idea about electricallighting, cable selection & protective device selection

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Electrical Lighting & Cable Selection

  1. 1. Electrical Lighting & Cable Selection<br />D.K.Pathirana<br />
  2. 2. Part 1<br />Finding required number of luminaries<br />
  3. 3. Types of Electrical Lighting<br />Ambient lighting<br />Task Lighting<br />Accent lighting<br />
  4. 4. Ambient lighting<br />
  5. 5. Task lighting<br />
  6. 6. Accent Lighting<br />
  7. 7. Lumen(Luminous flux) [F]<br /><ul><li>The lumen is defined such that…
  8. 8. At frequency of 540×1012hz, (i.e., at wavelength λ=555nm) 1 watt of radiant flux (power) will emit 683 lumens of light (luminous flux).</li></li></ul><li>Illuminance (E)<br />Defined as the luminous flux (lumens) falling on a surface per unit area normal to the surface.<br />The unit of illuminance is the Lux<br />
  9. 9. Luminaries<br />
  10. 10. Required no. of Luminaries<br /> E x Lx W<br /> N = _______________________<br /> NL x  x MF x UF x LLD<br /> E= Required Illuminance (Lux level)<br /> L = Room length (m)<br /> W = Room width (m)<br /> NL = Number of lamps in each luminaries<br /> N = Number of luminaries<br /> = Lamp flux<br /> M = Maintenance factor<br /> UF = Utilization factor<br /> LLD = Lamp Lumen Deterioration factor<br />
  11. 11. Maintanance factor (MF)<br />Can be defined as…<br /> Averageilluminanceon the working plane after a specified period of use of a lighting installation to the averageilluminanceobtained under the same conditions for a new installation. <br />
  12. 12. Lamps Lumen Deterioration (LLD)<br />Manufacturer data….<br />Examples.. <br />Compact fluorescent 0.85<br /> Mercury vapor 0.79<br /> Metal halide 0.83<br /> High pressure sodium 0.91<br />
  13. 13. Reflectance factor<br />the fraction of radiant energy that is reflected from a surface<br />Examples- 70% , 0.8, ...<br />Here 10 times the reflection factor…..<br /> 1.Ceiling <br /> 2. Walls <br /> 3. FloorWorking plane.<br />
  14. 14. Room Index<br />K = (LXW)/ [(H1-H0)X(L+W)]<br />Where,<br />L = Room Length (m)<br />W = Room Width (m)<br />H1 = Height of luminaire’s light emitting surface<br />H0 = Height of the working plan<br />
  15. 15. Utilization factor<br />
  16. 16. Example for lighting calculation sheet<br />
  17. 17. Recommended Lighting Levels<br />
  18. 18. Part 2<br />Load calculation<br />
  19. 19. Design power socket outlets….. If not given<br />Then analyse….<br />
  20. 20. Total load for the new wing = Total load for ground floor+1st floor+2nd floor……<br /> = 13.503+……+……<br /> =49.29Amp<br />
  21. 21. Bill Of Quantity (BOQ)<br />Example<br />
  22. 22. Part 3<br />Cable selection and Over load Protection<br />
  23. 23. Basic types of MCB’s<br />TYPE B<br />TYPE C<br />TYPE D <br />
  24. 24. Sizing the cables<br />length of the wire <br />Check the following inequality<br /> In<br /> It  ___________ and InIb<br /> CaCi CgCf<br /> It = Maximum current capacity of cable for given temp. <br />Ib = Design current <br /> In = Rated current of the protective device<br /> Ca = Correction factor for ambient temperature. <br /> CI = Correction factor for thermal insulation<br /> Cg = Correction factor for grouping<br />Cf = Correction factor for semi enclosed fuse. <br /> (for MCBs Cf = 1)<br />
  25. 25. Contd…<br />Refer IEE wiring regulation book<br />Lesser than 4% voltage drop….<br />
  26. 26. Selecting a protective device<br />Nature of the load<br />Rated current of the conductor<br />Environmental conditions<br />
  27. 27. Contd..<br />Ib rated current of protective diviceIz<br />Where, <br />Ib = Design service current<br />Iz = Maximum current carrying capacity of the conductor<br /> If 1.45 x Iz<br />Where, <br />Iz = Maximum current carrying capacity of the conductor<br /> If = Thermal tripping current of MCCB<br />
  28. 28. Single Line Diagram<br />
  29. 29. Questions……<br />
  30. 30. Thank you<br />

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