EET 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 l practical limit §A separate duplex must be installed in laundry or utility area. §A duplex at least every 6 feet

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

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

NEC Branch circuit requirements §Color code l neutral wire White or neutral gray l hot wireblack or red l ground wirebare or green

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

pull-chain lamp with duplex receptacle

switch with lampholder

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

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

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

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.

Wiring §wiring is in parallel §note each combination of wiring circuit §typical layout plan §typical wiring diagram

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 l see table 24-2

Assignment §Review questions 1-15 page 333 §Read Chapter 26, 27, 29