Electrical Notes

  Circuits: Topic Abstracts Lighting Circuit Per Circuit Not more than 10 Points of Lighting or Total 800Watt which is less Power Circuit For Residential Per Circuit Less than 2 No of 5A/15A Plug Socket Power Circuit For Non Residential Per Circuit Less than 1 No of 5A/15A Plug Socket Plug Socket In Residential wiring ,wiring of Socket outlet shall be done by copper Cable only Min Size of Wire For Lighting Circuit Smallest size of conductor shall be 1.5 Sq.mm Min Size of Wire For Power Circuit Smallest size of conductor shall be 4 Sq.mm Plug Socket Plug Socket 5A/6A or 15A/16A Socket shall be installed at following heights:                                                                   =For Non Residential building 23cm above  floor =For Kitchen 23cm above  Platform.  =For Bathroom not Socket is p...

  Luminous Efficacy, Lumen Maintenance and Color Rendition (Table-8) NBC Light Source  Wattage Efficacy (lm/W ) Average Life Maintenance Color Rendition Incandescent lamps  15 to 200  12 to 20  500 to 1000  Fair to good  Very good Tungsten halogen     300 to 1500  20 to 27  200 to 2000  Good to very good  Very good Standard fluorescent lamps       20 to 80 55 to 65 5000 Fair to good  Good Compact fluorescent lamps (CFL)       5 to 40  60 to 70 7500 Good Good to very good Slim line fluorescent      18 to 58 57 to 67 5000  Fair to good Good High pressure mercury vapor lamps      60 to 1000  50 to 65 5000  Very low to fair  Federate Blended – light lamps    160 to 250  20 to 30 5000 Low to fair  Federate High pressure sodium vapor lamps  50 to 1000...