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BRANCH CIRCUIT DESIGN AND DEVICE WIRING
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CONTENTS AT A GLANCE Overview
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NEC Branch Circuit Requirements
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Outdoor Wiring Protection Driptight and Watertight Enclosures Conduit for Outdoor Use Outdoor GFCI Protection 120-V Outdoor Extensions Low-Voltage Outdoor Wiring
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Wall-Mounted Wiring Device Diagrams Wall-Mounted Switch Wiring Diagrams Wall-Mounted Receptacle Wiring Diagrams Making Wiring Device Connections
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This chapter focuses on the wiring and devices used in residential and office branch circuits It starts by reviewing the National Electrical Code (NEC 2002) branch circuit requirements and includes diagrams for circuit, switch, and receptacle wiring In addition, it covers such subjects as the use of conduit in branch circuits, ground-fault circuitinterrupter (GFCI) protection, and the wiring of both 120-V AC and low-voltage AC
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Copyright 2003, 1997 by The McGraw-Hill Companies, Inc Click Here for Terms of Use
TLFeBOOK
BRANCH CIRCUIT DESIGN AND DEVICE WIRING
outdoor circuits The electrical devices discussed and illustrated in this chapter are standard products available in home improvement and hardware stores The information in this chapter is accurate to the best of the author s knowledge, but it is intended for educational and reference purposes, not as a guide for the performance of electrical work The publisher disclaims liability for any personal injury or property damage resulting from the use of or reliance on this text or diagrams for any purpose other than educational If used for another purpose, the reader should either rely on his or her own independent judgment or seek the advice of a licensed professional electrician
NEC Branch Circuit Requirements
The National Electrical Code (NEC 2002) provides guidance for electrical contractors and electricians, but it is really intended for use by governmental agencies that have legal jurisdiction over electrical installations and authorized electrical and insurance inspectors The many mandatory chapters include 2, Wiring and Protection, 3, Wiring Methods and Materials, and 4, Equipment for General Use These are supplemented by 5, Special Occupancies, 6, Special Equipment, and 7, Special Conditions NEC 2002 distinguishes between installations and equipment operating at under 600 V and those operating at over 600 V AC This chapter covers only installations and equipment operating at under 600 V AC It is important to remember that the code is not inflexible specific requirements can be waived when necessary where there is assurance that equivalent objectives can be achieved without compromising safety Local electrical and building codes as well as local power utilities may define local requirements more definitively than alternatives approved by the NEC that they, based on experience, consider to be too general However, under no circumstances will they relax any of the NEC provisions This chapter highlights important information from the first four chapters of NEC 2002, but this coverage is intended as a guide to rather than a substitute for the NEC text It is limited to the general intent of the mandatory requirements and does not discuss the many exceptions The reader is strongly advised to read carefully the NEC source articles and become aware of those exceptions NEC 2002, Article 210, Branch Circuits, in 2, Wiring and Protection, covers branch circuits except for those that supply only motor loads The ratings for branch circuits are 15, 20, 30, 40, and 50 A
I Permanent ground-fault circuit-interrupter (GFCI) protection is to be installed on
all 125-V single-phase, 15- and 20-A receptacles in bathrooms, garages, crawl , spaces, and unfinished basements, and at utility sinks and outdoor locations I The minimum number of branch circuits in a residence is to be determined from the total computed load and the size or rating of the circuits used
TLFeBOOK
WALL-MOUNTED WIRING DEVICE DIAGRAMS
I The load is to be evenly proportioned among multioutlet branch circuits within the
panelboard (main service panel or loadcenter)
I At least two 20-A branch circuits are to be provided for small appliances in
kitchens, laundry areas, and bathrooms
I Ampacity and size requirements for all branch circuit conductors are to be based on
I I I
I I I I I I
the noncontinuous load plus 125 percent of the continuous load Ampacity ratings of conductors are covered in Article 31015, 3, Wiring Methods and Materials Receptacle ratings must match or exceed the branch circuit ratings Copper branch-circuit conductor gauges must be 15 A, 14 gauge; 20 A, 12 gauge; 30 A, 10 gauge; 40 A, 8 gauge; and 50 A, 6 gauge Receptacle requirements are in addition to any receptacles that are part of a lighting fixture or appliance Receptacles installed in kitchens, family rooms, dining rooms, bedrooms, etc, are to be spaced so that no point along the floor line in any unbroken space is more than 6 ft from a receptacle Kitchen receptacles: Countertops must have at least two small-appliance branch circuits One is to be on any wall counter space more than 12 in wide, and none is to be more than 24 in from any point along the wall In general, they are to be less than 20 in above the countertop Island and peninsula countertop spaces (without adjacent walls) are to have at least one receptacle in each space measuring 12 in 24 in or more They can be less than 12 in below the countertop Bathroom wall receptacles: At least one is to be installed on the wall adjacent to and within 3 ft of the edge of each basin Outdoor receptacles: At least one is to be installed above grade not more than 65 ft at the front and back of the residence Laundry area receptacles: At least one is to be installed Basement and garage receptacles: At least one is to be installed in each basement and garage (attached or detached) Hallway receptacles: At least one is to be installed in hallways 10 ft long or more Lighting switch-controlled outlets: At least one is to be installed in all habitable rooms, bathrooms, hallways, stairways, garages, and outside of ground-level entrances In general, they should be on each floor and landing level of stairways
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