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EET 110 - Survey of Electronics

EET 110 - Survey of Electronics. Chapter 24 - Residential Branch Circuit Wiring. NEC Branch circuit requirements. all parts of a circuit that lie beyond the overcurrent device up to the last outlet. A max of 12 outlets per branch practical limit 8 - 10

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EET 110 - Survey of Electronics

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  1. EET 110 - Survey of Electronics Chapter 24 - Residential Branch Circuit Wiring

  2. NEC Branch circuit requirements • all parts of a circuit that lie beyond the overcurrent device up to the last outlet. • A max of 12 outlets per branch • practical limit 8 - 10 • A separate duplex must be installed in laundry or utility area. • A duplex at least every 6 feet

  3. NEC Branch circuit requirements • A duplex with GFI protection must be installed at counter height in bathroom/washroom • outdoor • at least one • one GFI circuit • garage • at least one duplex

  4. NEC Branch circuit requirements • Kitchen • at least 2 - 20A circuits for appliances. • No point on counter more than 24 inches from outlet • split receptacle outlet - 2 hot circuits • 50 A, 120V/240V for range

  5. NEC Branch circuit requirements • Color code • neutral wire White or neutral gray • hot wire black or red • ground wire bare or green

  6. pull-chain lamp with duplex receptacle • from a single fuse connection to device to neutral bus

  7. pull-chain lamp with duplex receptacle

  8. switch with lampholder

  9. switch with lampholder

  10. two lamps with a single switch • lamps run in parallel • all devices for household wiring are built for 120 volt

  11. Wiring Diagrams • Note that the wiring diagram illustrates the connections that should be made • It differs from the schematic for the same circuit S The wiring diagram for two lights in series w/ switch

  12. The schematic for this circuit Shows the lamps in parallel.

  13. Layout plan • Planning the electrical system requires laying out the physical devices in the floor plan. • Electrical connection to meet NEC rules and to identify switched circuits follows.

  14. Wiring • wiring is in parallel • note each combination of wiring circuit • typical layout plan • typical wiring diagram

  15. box placement • switch boxes from 44 to 48 inches from floor (bottom of box) • receptacle boxes from 12 to 18 inches from floor. • maximum number of wires allowed in boxes depend on size and number • see table 24-2

  16. Assignment • Review questions 1-15 page 333 • Read Chapter 26, 27, 29

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